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IV V Year – Electrical & Electronic Engineering Section-I: General Ability 1.
For or all positive numbers x and y which of following functions is f(x f(x-y) y) = f(x) - f(y) 2 (A) f(A) = a (B) f(A)= a+1 (C) f ( A ) = a (D) f(A)= -3a
2.
Find the wrong number in the series 2, 6, 29, 146, 877, 6140 (A) 6140 (B) 2 (C) 29
(D) 6
3.
In the sentence given below, pick up one option, which is most nearly same in meaning as the word printed in bold, and can replace it without altering meaning meaning of sentence. Being a member of this club, he has certain rights. (A) status (B) truth (C) virtues (D) privileges
4.
In the following question, choose the word which is the exact OPPOSITE of the given word. NIGGARDLY (A) Frugal (B) Thrifty (C) Stingy (D) Generous
5.
Pick out the most effective word from the given words to fill in the blank to make the sentence meaningfully complete. If negotiations are to prove fruitful, there must not only be sincerity on each side, but there must also be ........... in the sincerity of the other side. (A) Faith (B) Belief (C) Substance (D) Certainty
6.
B and C working together can do a job in 24 days. After working together for 15 days, B left. C took 15 more days to do the remaining job. If B works alone, in how many days can he finish the job? (A) 30 (B) 40 (C) 48 (D) 60
7.
A dishonest dealer marks up the price of his goods by 20% and gives a discount of 10% to the customer. Besides, he also cheats both his supplier and his buyer by 100 grams while wh buying and selling 1 kilogram. Find the percentage profit earned by the shopkeeper. (A) 30 (B) 35 (C) 32 (D) 29
8.
In a group of 6 boys and 4 girls, 4 children are to be selected. In how many different ways they can be selected such that atleast 2 boys b are there? (A) 100 (B) 205 (C) 185 (D) 211 SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 9.
80 percent of the employees in a company are male. 10 percent of the employees in the company are currently in Tamilnadu. Of the employees in Tamilnadu, 40 percent are in Chennai, 40 percent are in Coimbatore, and 20 percent are in Trichy. Of the employees at Chennai, 75 percent are male. What percent of the company's female employees are currently in Chennai? (A) 18 percent (B) 15 percent (C) 21 percent (D) 6 percent
10.
Average traffic at Paradise Paradis X roads during Monday-Thursday Thursday is 21 vehicles per minute. The respective value during Thursday Thursday-Sunday Sunday is 28 vehicles per min. Which of the following values are possible for average traffic for all days (in vehicles per minute)? (i) 16 (ii) 20 (iii) 28 (A) Only ii (B) ii and iii (C) i and iii (D) i, ii, and iii
11.
You win some and loose some. You must enjoy winning. But do not let it go to the head. The moment it does, you are already on your way to failure. If you encounter a failure, don’t beat bea yourself for it or anyone else for that matter. Accept it, look at your own share in the problem, learn from it and move on. Choose the summary: (A) Where there is a will there is a way (B) Failure is the stepping stone of success (C) Winners don’t do different things, but do things differently. (D) When you lose, don’t n’t lose the lesson
12.
Janak is participating in a 180 km bike race. Janak rides at an average speed of 30 km per hour for the first one-third third distance, 20 km per hour for fo the next one-third third distance, and 10 km per hour for the final 60 km. What was Janak’s average speed for the race? (A) 15 km/h (B) 16.67 km/h (C) 22.5 km/h (D) 16.36 km/h
13.
In question below, there is a sentence of which some parts has been jumbled up. Rearrange these parts, which are labeled P, Q, R, and S to produce the correct sentence. Choose the proper sequence. It would (P) appear from his statement (Q) about the policy of management (R) in dealing with the strike (S) that he was quite in the dark da The proper sequence should be: (A) RPSQ (B) PSQR (C) RQPS (D) PRQS SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 14.
There are 65 questions in a 3 hr examination. Among these questions there are 15 general aptitude problems. It is suggested that two two-thirds thirds as much time be spent on each general aptitude problem as for each other question. How many minutes should be spent on general aptitude problems? (A) 30 (B) 45 (C) 50 (D) 60
15.
According to the Sci-True True Lab, the new micro micro-organism organism is discovered in certain lakes was identified once as spherical, once as cubical, and once as spiral, but has never been seen to assume the same shape twice. Which of the following is implied in the above statement? (A) The new micro-organism organism can be expected eventually to assume every possible shape. (B) The new micro-organism organism is different from all organisms previously known. (C) The Sci-True True Lab is not a reliable source of information about the new micro-organism. micro (D) The new micro-organism organism can be identified on the basis of some characteristic other than shape.
16.
Choose the best inference from the given statement Statement:: If it does not rain throughout this month, most farmers will be in trouble this year. (A) Most of the farmers are generally dependent on rains. (B) There is no water in tthe ponds (C) The monsoon Winds are late this year. (D) Wheat and paddy require water for cultivation.
17.
Choose a pair that has most similar relationship to the given pair Interested: Zealous (A) Wild: Bizarre (B) Decent: Contemporary (C) Hateful: Nauseous (D) Hungry: Ravenous
18.
In a survey of unemployed, three-fifths three fifths admitted to being at least somewhat dishonest. However, the survey may underestimate the proportion of respondents who are dishonest, because________. (A) Some dishonest respondents taking the survey might have claimed to be honest on the survey (B) Some generally honest respondents taking the survey might have claimed on the survey to be dishonest (C) Some respondents who claimed on the survey to be at least a little dishonest dishonest may be very dishonest (D) Some respondents who claimed on the survey to be dishonest may have been answering honestly SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 19.
Identify the choice that replaces the underlined part to form a logically and grammatically correct statement. The greatest obstacle to economic and environmental improvements in developing countries is its mammoth foreign debt. (A) developing countries is its (B) the developing countries is its (C) developing countries is their (D) the developing countries is th their
20.
Data of different states regarding population of states in the year 1998: Total population of given states = 32, 76,000 U.P 15%
T.N 9%
Bihar 11%
A.P
Goa
25%
12% Delhi 8%
M.P 20%
Following table shows that sex & literacy wise population ratio: States Andhra Pradesh Madhya Pradesh Delhi Goa Bihar Uttar Pradesh Tamil Nadu
Sex Literacy Male Female Literate Illiterate 5 3 2 7 3 1 1 4 2 3 2 1 3 5 3 2 3 4 4 1 3 2 7 2 3 4 9 4
What will be the total percentage of total number of males in U.P, M.P & Goa together to the total population of all given states ? (A) 28.5% (B) 18.5% (C) 23% (D) 32% SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering Section-II: Technical 21.
The voltage across the last resistor is V. All the resistors are unity. Then VS is 1Ω
+ −
VS
(A) 13V 22.
1Ω
1Ω
1Ω
1Ω
(B) 19V
1Ω
(C) 25V
+ V −
(D) 8V
Let p be the probability that a man aged y will get into an accident in a year. What is the probability that a man among ‘n’ men of all aged ‘y’ will get into accident first?
(A)
1 n 1 − (1 − p ) n
(B)
1 n 1 − (1 + p ) n
(C)
(1 − p )
n n (D) n 1 − (1 − p )
n
23.
An induction motor is delivering an output of 37 kW and has an efficiency of 90%. At this load, the stator and rotor copper loss each equals to the iron loss. The mechanical losses are one third of the no load loss. What is the value of mechanical loss? (A) 1174.6 W (B) 1370.3 W (C) 587.3 W (D) 4111 W
24.
A power system network is shown below:
# 1.2PU
E =1.2PU
0.6PU
V =1.0
H = 4 MW − S / MVA, f = 50 Hz, The frequency of oscillations when alternator is loaded to 80%
of Pmax is __________. (A) 0.63Hz
(B) 1.3Hz
(C) 0.3Hz
(D) 2.5Hz
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 25.
A 60 Hz transformer has hysteresis loss to be twice its eddy current loss when operated at rated condition. ition. What will be the effect on core loss when operated at 54 Hz and 90% of rated voltage? (A) Reduces by 25.5% (B) Increases by 16.6% (C) Decreases by 13.3% (D) Remains unchanged
26.
In the following Op-Amp, Amp, when only V1 of 1 V is applied and V2 is grounded then output is -8 V and when only V2 of 2 V is applied and V1 is kept at 0 V, output is 20 V then CMRR of op-amp op is approximately (A) 13 dB (C) 43 dB
27.
(B) 20 dB (D) 68 dB
V1
−
V2
+
V0
f(t)
Given a function f(t) as shown below.
1
+1
0
−1
E
The above signal is fed as input to (all inputs, outputs and system function given in frequency domain) ω2 4
F ( jω )
The magnitude of output at ω =
(A) 1 28.
(B) 0
2
( )
output
π rad/sec is 2 (C) 0.08
(D) 0.64
dy = 3 (1 + x ) − y and y = 4 when x = 1. Using Runga-Kutta Kutta fourth order method, the dx approximate value of y when x = 1.2 will be (A) 0.419 (B) 0.519 (C) 0.613 (D) 0.318
Given:
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 29.
30.
The given figure shows a step down chopper switched at 1 kHz with a duty ratio D = 0.5. The peak to peak ripple in load current is close to _____. (A) 0.125A (B) 1.5A (C) 2.625A (D) 5A
100V
i
+ 5Ω −
Consider the system shown in the figure X f 5
4 3
H (f )
3 3
The Transfer function
(B)
(C) (D)
+
1 −2 −1 0 1
f
The D.C component in signal y(t) is (A) 0.9341 (B) 0
(A)
1Ω
2
5
−3 −1 0 1
31.
200 mH
Y (s) X (s)
g (t )
f
2
(C) 12
1F
−
y (t )
(D) 8
of the LTI system shown below is
G1 ( s ) G 2 ( s ) + 1 1 − G1 ( s ) G 2 ( s )
+
G 2 ( s ) 1 + G1 ( s ) 1 − G 2 ( s ) G1 ( s )
+ X ( s)
G1 ( s ) 1 + G1 ( s ) 1 − G1 ( s ) + G 2 ( s ) G 2 ( s ) (1 + G1 ( s ) )
G1 ( s )
+ +
G2 ( s )
Y ( s)
1 + G1 ( s ) + G 2 ( s )
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 32.
A 80kW, 440 V, 800 rpm d.c motor is operating at 600 rpm and developing 75% rated torque is controlled by 3 − φ , six--pulse pulse thyristor converter. The input of the converter is 3 − φ , 415V, 50Hz a.c supply, excitation is kept constant. If the back emf at rated condition is 410V, determine the triggering angle of the converter.
(A) 53.91o 33.
Solution for
(B) 69.31o
∫ (a x 2
2
+ b2 y2 + c2 z 2 )
(C) 95.31o −1
2
(D) 31.59o
dS where S is surface of ellipsoid ax 2 + by2 + cz2 = 1 is
S
(A) 34.
4π abc
(B)
4π 3 abc
(C)
4π abc 3
(D) None of these
A 1 − φ , 220V energy meter disc makes 5329.5 revolutions when meter has a constant load of 10A passing through it for 6 hours at 0.85 p.f. Calculate the power factor of the load if the number of revolutions made are 2375 for same operating voltage and a current of 12A for 4 hours. (A) 0.4734 (B) 0.5265 (C) 0.8939 (D) 0.9989
35.
A3 A 2 A1A 0 4
B3 B2 B1 , B0
Quad ruple Two-to-one Line MUX
Select
4 ×1 MUX
S1
B2
S0
In the above digital circuit, to get an output bit as ‘B2’ what are the values of select and S1S0? (A) Select = 0;S1S0 = 10 (B) Select = 1;S1S0 = 10
(C) Select = 1; S1S0 = 01 36.
(D) Select = 0; S1S0 = 01
A Lossless Transmission line having a surge impedance loading (SIL) of 2280MW. A series capacitive compensation of 30% is emplaced. The surge impedance loading loadi of compensated transmission line will be _________. (A) 1174.6 MW (B) 1370.3MW (C) 2725.12M W (D) 2350.82MW
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 37.
Consider the differential equation, Find the P.I. of the above equation. cos nx xsin nx logsec nx + (A) 2 n n cos nx xsin nx logsec nx (C) n2 n
38.
d2 y + n 2 y = sec nx [ n ≠ 0] dx 2
cos nx xsin nx log cos nx + 2 n n cos nx xsin nx log cos nx (D) n2 n (B)
A DC series motor is running a constant – torque load at 800 rpm taking 30A from 200V supply. The field resistance and armature resistance are 0.05Ω & 0.01Ω respectively. A diverter of 0.06Ω
is placed across the field resistance to increase the speed. If the field flux is unsaturated, the new speed is _________. (A) 1174rpm (B) 1370rpm (C) 1085rpm (D) 1000rpm 39.
For the figure shown, r ( t ) = sin ωt. and the steady state response C(t) will exhibit a response peak att a frequency of _________ . (A) 3.5 rad/sec (B) 2.8 rad/sec (C) 4.3 rad/sec (D) 6.8 rad/sec
40.
r ( t) + -
16 s ( s + 4)
c ( t)
For common base operation of a BJT, which of the following are correct? I. High voltage gain II. Excellent high frequency response III. High input resistance IV. Ideal current buffer (A) I and II (B) I and III (C) I, II and III (D) I, II and IV 1 2− y
41.
∫0 ∫y xydxdy =___________. (A) 0.392
(B) 0.292
(C) 0.492
(D) 0.153
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 42.
A CRO is used to record the impulse wave during a test in a laboratory as shown in figure.
Im pulse Generator
zo
Test
CRO
object
τ = 1µ sec zo
The parameters of the impulse wave are rise time=1.2 µ sec and fall time= 50µ sec. To record the waveform without any missing data, the bandwidth of the CRO should should be greater than ________. ________ (A) 0.292MHz (B) 0.526MHz (C) 0.893MHz (D) 0.99MHz 43.
44.
The power dissipated in the 5 Ω resistor for the circuit shown in figure is (A) 2.4W (B) 1.9W (C) 3.2W (D) 8W
5V
10V
+
2A
−
10Ω
+
−
5Ω
1Ω
Vector magnetic potential A due to a direct current in a conductor in free space is
A = (x 2 + y2 )a x wb / m2 . Determine the magnetic field produced by the current element at (1,2,3). (A) H =
45.
4 µo
(B) H =
1 µo
(C) H =
3 µo
(D) H = 0
The frequency of the pulse at x4 in the network shown below is
x0
10-bit Ring counter
x1
4-bit parallel counter
x2
Mod 25 Ripple counter
x3
4-bit Johnson counter
x4
2-bit Ring counter
x5
(320kHz) (A) 10Hz
(B) 15Hz
(C) 20Hz
(D) 25Hz
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 46.
Consider the Hay’s bridge shown in the figure where R 1 = 1kΩ R 2 = 8k R 3 = 800 Ω . Quality factor of the coil is 5. The bridge is under balanced ba ω=1000rad/sec. The value of resistance R4 is (A) 246Ω
condition.
L1
R3
R1 D
R2
(B) 6.4 kΩ
c4
R4
(C) 6.14 kΩ (D) 10 kΩ
47.
For the circuit shown in figure, the input to the circuit is 240V, 50H 50Hz.. The firing angle of the thyristor is 45° 10 10Ω RMS value of the thyristor current is ________. (A) 5.5A (B) 2.67A E = 200V (C) 13.94A (D) 11A
48.
The equivalent capacitor arrangement of a two string insulator is given in figure. The maximum voltage insulator is shown in figure. The maximum voltage that each unit can with stand should not exceed 17.5 kV. The line voltage of complete string is__________. is__________ (A) 17.5 kV (B) 33kV
C=
1 c 8
C
(C) 35 kV C
(D) 37.3 kV V
SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 49.
Figure shown represents the phasor diagram for a synchronous motor operating at 0.6 leading power factor with no armature resistance. The current and power factor remains same & current is 15A. Calculate the torque angle of the synchronous motor if the armature armature resistance of 2Ω is included. EA
(A) 38.65°
Vφ = 60V
R A IA
(B) 32.96°
jX s I A = j40V
(C) 23.57° (D) 22.96°
50.
EA
For the network shown below, switch was open for very long time and is thrown at t = 0. The value VL at t = 1 sec is given by (A) 0.47 V
20Ω
10 Ω
+
8V
(B) 1 V
10H
(C) 1.47 V
10V
VL −
(D) Can’t be determined
SPACE FOR ROUGH WORK
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For or all positive numbers x and y which of following functions is f(x f(x-y) y) = f(x) - f(y) 2 (A) f(A) = a (B) f(A)= a+1 (C) f ( A ) = a (D) f(A)= -3a
2.
Find the wrong number in the series 2, 6, 29, 146, 877, 6140 (A) 6140 (B) 2 (C) 29
(D) 6
3.
In the sentence given below, pick up one option, which is most nearly same in meaning as the word printed in bold, and can replace it without altering meaning meaning of sentence. Being a member of this club, he has certain rights. (A) status (B) truth (C) virtues (D) privileges
4.
In the following question, choose the word which is the exact OPPOSITE of the given word. NIGGARDLY (A) Frugal (B) Thrifty (C) Stingy (D) Generous
5.
Pick out the most effective word from the given words to fill in the blank to make the sentence meaningfully complete. If negotiations are to prove fruitful, there must not only be sincerity on each side, but there must also be ........... in the sincerity of the other side. (A) Faith (B) Belief (C) Substance (D) Certainty
6.
B and C working together can do a job in 24 days. After working together for 15 days, B left. C took 15 more days to do the remaining job. If B works alone, in how many days can he finish the job? (A) 30 (B) 40 (C) 48 (D) 60
7.
A dishonest dealer marks up the price of his goods by 20% and gives a discount of 10% to the customer. Besides, he also cheats both his supplier and his buyer by 100 grams while wh buying and selling 1 kilogram. Find the percentage profit earned by the shopkeeper. (A) 30 (B) 35 (C) 32 (D) 29
8.
In a group of 6 boys and 4 girls, 4 children are to be selected. In how many different ways they can be selected such that atleast 2 boys b are there? (A) 100 (B) 205 (C) 185 (D) 211 SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 9.
80 percent of the employees in a company are male. 10 percent of the employees in the company are currently in Tamilnadu. Of the employees in Tamilnadu, 40 percent are in Chennai, 40 percent are in Coimbatore, and 20 percent are in Trichy. Of the employees at Chennai, 75 percent are male. What percent of the company's female employees are currently in Chennai? (A) 18 percent (B) 15 percent (C) 21 percent (D) 6 percent
10.
Average traffic at Paradise Paradis X roads during Monday-Thursday Thursday is 21 vehicles per minute. The respective value during Thursday Thursday-Sunday Sunday is 28 vehicles per min. Which of the following values are possible for average traffic for all days (in vehicles per minute)? (i) 16 (ii) 20 (iii) 28 (A) Only ii (B) ii and iii (C) i and iii (D) i, ii, and iii
11.
You win some and loose some. You must enjoy winning. But do not let it go to the head. The moment it does, you are already on your way to failure. If you encounter a failure, don’t beat bea yourself for it or anyone else for that matter. Accept it, look at your own share in the problem, learn from it and move on. Choose the summary: (A) Where there is a will there is a way (B) Failure is the stepping stone of success (C) Winners don’t do different things, but do things differently. (D) When you lose, don’t n’t lose the lesson
12.
Janak is participating in a 180 km bike race. Janak rides at an average speed of 30 km per hour for the first one-third third distance, 20 km per hour for fo the next one-third third distance, and 10 km per hour for the final 60 km. What was Janak’s average speed for the race? (A) 15 km/h (B) 16.67 km/h (C) 22.5 km/h (D) 16.36 km/h
13.
In question below, there is a sentence of which some parts has been jumbled up. Rearrange these parts, which are labeled P, Q, R, and S to produce the correct sentence. Choose the proper sequence. It would (P) appear from his statement (Q) about the policy of management (R) in dealing with the strike (S) that he was quite in the dark da The proper sequence should be: (A) RPSQ (B) PSQR (C) RQPS (D) PRQS SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 14.
There are 65 questions in a 3 hr examination. Among these questions there are 15 general aptitude problems. It is suggested that two two-thirds thirds as much time be spent on each general aptitude problem as for each other question. How many minutes should be spent on general aptitude problems? (A) 30 (B) 45 (C) 50 (D) 60
15.
According to the Sci-True True Lab, the new micro micro-organism organism is discovered in certain lakes was identified once as spherical, once as cubical, and once as spiral, but has never been seen to assume the same shape twice. Which of the following is implied in the above statement? (A) The new micro-organism organism can be expected eventually to assume every possible shape. (B) The new micro-organism organism is different from all organisms previously known. (C) The Sci-True True Lab is not a reliable source of information about the new micro-organism. micro (D) The new micro-organism organism can be identified on the basis of some characteristic other than shape.
16.
Choose the best inference from the given statement Statement:: If it does not rain throughout this month, most farmers will be in trouble this year. (A) Most of the farmers are generally dependent on rains. (B) There is no water in tthe ponds (C) The monsoon Winds are late this year. (D) Wheat and paddy require water for cultivation.
17.
Choose a pair that has most similar relationship to the given pair Interested: Zealous (A) Wild: Bizarre (B) Decent: Contemporary (C) Hateful: Nauseous (D) Hungry: Ravenous
18.
In a survey of unemployed, three-fifths three fifths admitted to being at least somewhat dishonest. However, the survey may underestimate the proportion of respondents who are dishonest, because________. (A) Some dishonest respondents taking the survey might have claimed to be honest on the survey (B) Some generally honest respondents taking the survey might have claimed on the survey to be dishonest (C) Some respondents who claimed on the survey to be at least a little dishonest dishonest may be very dishonest (D) Some respondents who claimed on the survey to be dishonest may have been answering honestly SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering 19.
Identify the choice that replaces the underlined part to form a logically and grammatically correct statement. The greatest obstacle to economic and environmental improvements in developing countries is its mammoth foreign debt. (A) developing countries is its (B) the developing countries is its (C) developing countries is their (D) the developing countries is th their
20.
Data of different states regarding population of states in the year 1998: Total population of given states = 32, 76,000 U.P 15%
T.N 9%
Bihar 11%
A.P
Goa
25%
12% Delhi 8%
M.P 20%
Following table shows that sex & literacy wise population ratio: States Andhra Pradesh Madhya Pradesh Delhi Goa Bihar Uttar Pradesh Tamil Nadu
Sex Literacy Male Female Literate Illiterate 5 3 2 7 3 1 1 4 2 3 2 1 3 5 3 2 3 4 4 1 3 2 7 2 3 4 9 4
What will be the total percentage of total number of males in U.P, M.P & Goa together to the total population of all given states ? (A) 28.5% (B) 18.5% (C) 23% (D) 32% SPACE FOR ROUGH WORK
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IV V Year – Electrical & Electronic Engineering Section-II: Technical 21.
The voltage across the last resistor is V. All the resistors are unity. Then VS is 1Ω
+ −
VS
(A) 13V 22.
1Ω
1Ω
1Ω
1Ω
(B) 19V
1Ω
(C) 25V
+ V −
(D) 8V
Let p be the probability that a man aged y will get into an accident in a year. What is the probability that a man among ‘n’ men of all aged ‘y’ will get into accident first?
(A)
1 n 1 − (1 − p ) n
(B)
1 n 1 − (1 + p ) n
(C)
(1 − p )
n n (D) n 1 − (1 − p )
n
23.
An induction motor is delivering an output of 37 kW and has an efficiency of 90%. At this load, the stator and rotor copper loss each equals to the iron loss. The mechanical losses are one third of the no load loss. What is the value of mechanical loss? (A) 1174.6 W (B) 1370.3 W (C) 587.3 W (D) 4111 W
24.
A power system network is shown below:
# 1.2PU
E =1.2PU
0.6PU
V =1.0
H = 4 MW − S / MVA, f = 50 Hz, The frequency of oscillations when alternator is loaded to 80%
of Pmax is __________. (A) 0.63Hz
(B) 1.3Hz
(C) 0.3Hz
(D) 2.5Hz
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IV V Year – Electrical & Electronic Engineering 25.
A 60 Hz transformer has hysteresis loss to be twice its eddy current loss when operated at rated condition. ition. What will be the effect on core loss when operated at 54 Hz and 90% of rated voltage? (A) Reduces by 25.5% (B) Increases by 16.6% (C) Decreases by 13.3% (D) Remains unchanged
26.
In the following Op-Amp, Amp, when only V1 of 1 V is applied and V2 is grounded then output is -8 V and when only V2 of 2 V is applied and V1 is kept at 0 V, output is 20 V then CMRR of op-amp op is approximately (A) 13 dB (C) 43 dB
27.
(B) 20 dB (D) 68 dB
V1
−
V2
+
V0
f(t)
Given a function f(t) as shown below.
1
+1
0
−1
E
The above signal is fed as input to (all inputs, outputs and system function given in frequency domain) ω2 4
F ( jω )
The magnitude of output at ω =
(A) 1 28.
(B) 0
2
( )
output
π rad/sec is 2 (C) 0.08
(D) 0.64
dy = 3 (1 + x ) − y and y = 4 when x = 1. Using Runga-Kutta Kutta fourth order method, the dx approximate value of y when x = 1.2 will be (A) 0.419 (B) 0.519 (C) 0.613 (D) 0.318
Given:
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IV V Year – Electrical & Electronic Engineering 29.
30.
The given figure shows a step down chopper switched at 1 kHz with a duty ratio D = 0.5. The peak to peak ripple in load current is close to _____. (A) 0.125A (B) 1.5A (C) 2.625A (D) 5A
100V
i
+ 5Ω −
Consider the system shown in the figure X f 5
4 3
H (f )
3 3
The Transfer function
(B)
(C) (D)
+
1 −2 −1 0 1
f
The D.C component in signal y(t) is (A) 0.9341 (B) 0
(A)
1Ω
2
5
−3 −1 0 1
31.
200 mH
Y (s) X (s)
g (t )
f
2
(C) 12
1F
−
y (t )
(D) 8
of the LTI system shown below is
G1 ( s ) G 2 ( s ) + 1 1 − G1 ( s ) G 2 ( s )
+
G 2 ( s ) 1 + G1 ( s ) 1 − G 2 ( s ) G1 ( s )
+ X ( s)
G1 ( s ) 1 + G1 ( s ) 1 − G1 ( s ) + G 2 ( s ) G 2 ( s ) (1 + G1 ( s ) )
G1 ( s )
+ +
G2 ( s )
Y ( s)
1 + G1 ( s ) + G 2 ( s )
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IV V Year – Electrical & Electronic Engineering 32.
A 80kW, 440 V, 800 rpm d.c motor is operating at 600 rpm and developing 75% rated torque is controlled by 3 − φ , six--pulse pulse thyristor converter. The input of the converter is 3 − φ , 415V, 50Hz a.c supply, excitation is kept constant. If the back emf at rated condition is 410V, determine the triggering angle of the converter.
(A) 53.91o 33.
Solution for
(B) 69.31o
∫ (a x 2
2
+ b2 y2 + c2 z 2 )
(C) 95.31o −1
2
(D) 31.59o
dS where S is surface of ellipsoid ax 2 + by2 + cz2 = 1 is
S
(A) 34.
4π abc
(B)
4π 3 abc
(C)
4π abc 3
(D) None of these
A 1 − φ , 220V energy meter disc makes 5329.5 revolutions when meter has a constant load of 10A passing through it for 6 hours at 0.85 p.f. Calculate the power factor of the load if the number of revolutions made are 2375 for same operating voltage and a current of 12A for 4 hours. (A) 0.4734 (B) 0.5265 (C) 0.8939 (D) 0.9989
35.
A3 A 2 A1A 0 4
B3 B2 B1 , B0
Quad ruple Two-to-one Line MUX
Select
4 ×1 MUX
S1
B2
S0
In the above digital circuit, to get an output bit as ‘B2’ what are the values of select and S1S0? (A) Select = 0;S1S0 = 10 (B) Select = 1;S1S0 = 10
(C) Select = 1; S1S0 = 01 36.
(D) Select = 0; S1S0 = 01
A Lossless Transmission line having a surge impedance loading (SIL) of 2280MW. A series capacitive compensation of 30% is emplaced. The surge impedance loading loadi of compensated transmission line will be _________. (A) 1174.6 MW (B) 1370.3MW (C) 2725.12M W (D) 2350.82MW
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IV V Year – Electrical & Electronic Engineering 37.
Consider the differential equation, Find the P.I. of the above equation. cos nx xsin nx logsec nx + (A) 2 n n cos nx xsin nx logsec nx (C) n2 n
38.
d2 y + n 2 y = sec nx [ n ≠ 0] dx 2
cos nx xsin nx log cos nx + 2 n n cos nx xsin nx log cos nx (D) n2 n (B)
A DC series motor is running a constant – torque load at 800 rpm taking 30A from 200V supply. The field resistance and armature resistance are 0.05Ω & 0.01Ω respectively. A diverter of 0.06Ω
is placed across the field resistance to increase the speed. If the field flux is unsaturated, the new speed is _________. (A) 1174rpm (B) 1370rpm (C) 1085rpm (D) 1000rpm 39.
For the figure shown, r ( t ) = sin ωt. and the steady state response C(t) will exhibit a response peak att a frequency of _________ . (A) 3.5 rad/sec (B) 2.8 rad/sec (C) 4.3 rad/sec (D) 6.8 rad/sec
40.
r ( t) + -
16 s ( s + 4)
c ( t)
For common base operation of a BJT, which of the following are correct? I. High voltage gain II. Excellent high frequency response III. High input resistance IV. Ideal current buffer (A) I and II (B) I and III (C) I, II and III (D) I, II and IV 1 2− y
41.
∫0 ∫y xydxdy =___________. (A) 0.392
(B) 0.292
(C) 0.492
(D) 0.153
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IV V Year – Electrical & Electronic Engineering 42.
A CRO is used to record the impulse wave during a test in a laboratory as shown in figure.
Im pulse Generator
zo
Test
CRO
object
τ = 1µ sec zo
The parameters of the impulse wave are rise time=1.2 µ sec and fall time= 50µ sec. To record the waveform without any missing data, the bandwidth of the CRO should should be greater than ________. ________ (A) 0.292MHz (B) 0.526MHz (C) 0.893MHz (D) 0.99MHz 43.
44.
The power dissipated in the 5 Ω resistor for the circuit shown in figure is (A) 2.4W (B) 1.9W (C) 3.2W (D) 8W
5V
10V
+
2A
−
10Ω
+
−
5Ω
1Ω
Vector magnetic potential A due to a direct current in a conductor in free space is
A = (x 2 + y2 )a x wb / m2 . Determine the magnetic field produced by the current element at (1,2,3). (A) H =
45.
4 µo
(B) H =
1 µo
(C) H =
3 µo
(D) H = 0
The frequency of the pulse at x4 in the network shown below is
x0
10-bit Ring counter
x1
4-bit parallel counter
x2
Mod 25 Ripple counter
x3
4-bit Johnson counter
x4
2-bit Ring counter
x5
(320kHz) (A) 10Hz
(B) 15Hz
(C) 20Hz
(D) 25Hz
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IV V Year – Electrical & Electronic Engineering 46.
Consider the Hay’s bridge shown in the figure where R 1 = 1kΩ R 2 = 8k R 3 = 800 Ω . Quality factor of the coil is 5. The bridge is under balanced ba ω=1000rad/sec. The value of resistance R4 is (A) 246Ω
condition.
L1
R3
R1 D
R2
(B) 6.4 kΩ
c4
R4
(C) 6.14 kΩ (D) 10 kΩ
47.
For the circuit shown in figure, the input to the circuit is 240V, 50H 50Hz.. The firing angle of the thyristor is 45° 10 10Ω RMS value of the thyristor current is ________. (A) 5.5A (B) 2.67A E = 200V (C) 13.94A (D) 11A
48.
The equivalent capacitor arrangement of a two string insulator is given in figure. The maximum voltage insulator is shown in figure. The maximum voltage that each unit can with stand should not exceed 17.5 kV. The line voltage of complete string is__________. is__________ (A) 17.5 kV (B) 33kV
C=
1 c 8
C
(C) 35 kV C
(D) 37.3 kV V
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IV V Year – Electrical & Electronic Engineering 49.
Figure shown represents the phasor diagram for a synchronous motor operating at 0.6 leading power factor with no armature resistance. The current and power factor remains same & current is 15A. Calculate the torque angle of the synchronous motor if the armature armature resistance of 2Ω is included. EA
(A) 38.65°
Vφ = 60V
R A IA
(B) 32.96°
jX s I A = j40V
(C) 23.57° (D) 22.96°
50.
EA
For the network shown below, switch was open for very long time and is thrown at t = 0. The value VL at t = 1 sec is given by (A) 0.47 V
20Ω
10 Ω
+
8V
(B) 1 V
10H
(C) 1.47 V
10V
VL −
(D) Can’t be determined
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