IES/ESE Paper (Electronics) Prelims Paper II - 2019 | GATE, ISRO & IES/ESE Previous Year Solved Papers - Mechanical Engineering PDF Download

 Page 1


evineatg Service (I
)
) Examy2019 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
T.B.C. : VBY—S—ELX 	 Test Booklet Series 
Serial No. 
TEST BOOKLET 
004 GO 85 
ELECTRONICS AND TELECOMMUNICATION 
ENGINEERING 
Time Allowed : Three Hours 
	 Maximum Marks: 300 
INSTRUCTIONS 
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK 
THAT THIS TEST BOOKLET DOES NOT 
HAVE ANY UNPRINTED OR TORN OR MISSING PAGES 
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET. 
Please note that it is the candidate's responsibility to encode and fill in the Roll Number 
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at 
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render 
the Answer Sheet liable for rejection. 
You have to enter your Roll Number on the Test Booklet in 
the Box provided alongside. DO NOT write anything else on 
the Test Booklet. 
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers). 
You will select the response which you want to mark on the Answer Sheet. In case you feel that 
there is more than one correct response, mark the response which you consider the best. In any 
case, choose ONLY ONE response for each item. 
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in 
the Answer Sheet. 
All items carry equal marks. 
Before you proceed to mark in the Answer Sheet the response to various items in the Test 
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you 
with your Admission Certificate. 
After you have completed filling in all your responses on the Answer Sheet and the examination 
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted 
to take away with you the Test Booklet. 
Sheets for rough work are appended in the Test Booklet at the end. 
Penalty for wrong answers : 
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE. 
There are four alternatives for the answer to every question. For each question for which a 
wrong answer has been given by the candidate, 
one-third (0.33) of the marks assigned to 
that question will be deducted as penalty. 
If a candidate gives more than one answer, it will be treated as a 
wrong answer even if one of 
the given answers happens to be correct and there will be same penalty as above to that 
question. 
If a question is left blank, i.e., no answer is given by the candidate, there will be 
no penalty 
for that question. 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
(I) 
Page 2


evineatg Service (I
)
) Examy2019 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
T.B.C. : VBY—S—ELX 	 Test Booklet Series 
Serial No. 
TEST BOOKLET 
004 GO 85 
ELECTRONICS AND TELECOMMUNICATION 
ENGINEERING 
Time Allowed : Three Hours 
	 Maximum Marks: 300 
INSTRUCTIONS 
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK 
THAT THIS TEST BOOKLET DOES NOT 
HAVE ANY UNPRINTED OR TORN OR MISSING PAGES 
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET. 
Please note that it is the candidate's responsibility to encode and fill in the Roll Number 
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at 
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render 
the Answer Sheet liable for rejection. 
You have to enter your Roll Number on the Test Booklet in 
the Box provided alongside. DO NOT write anything else on 
the Test Booklet. 
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers). 
You will select the response which you want to mark on the Answer Sheet. In case you feel that 
there is more than one correct response, mark the response which you consider the best. In any 
case, choose ONLY ONE response for each item. 
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in 
the Answer Sheet. 
All items carry equal marks. 
Before you proceed to mark in the Answer Sheet the response to various items in the Test 
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you 
with your Admission Certificate. 
After you have completed filling in all your responses on the Answer Sheet and the examination 
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted 
to take away with you the Test Booklet. 
Sheets for rough work are appended in the Test Booklet at the end. 
Penalty for wrong answers : 
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE. 
There are four alternatives for the answer to every question. For each question for which a 
wrong answer has been given by the candidate, 
one-third (0.33) of the marks assigned to 
that question will be deducted as penalty. 
If a candidate gives more than one answer, it will be treated as a 
wrong answer even if one of 
the given answers happens to be correct and there will be same penalty as above to that 
question. 
If a question is left blank, i.e., no answer is given by the candidate, there will be 
no penalty 
for that question. 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
(I) 
5. In the Wien bridge oscillator, the 00 
phase-shift is met by using lead-lag 
network and by using 
(a) inverting op-amp 
1. Consider a common-emitter current gain 
of p = 150 and a base current of 
in  = 15 µA. If the transistor is biased in 
the forward active mode, the collector 
and emitter current will be 
2.25 mA and 2.27 mA 
3.25 mA and 2.27 mA 
2.25 mA and 1•37 mA 
3.25 mA and 1•37 mA 
2. The input to a bridge rectifier is 230 V 
(r.m.s.), 50 Hz. The d.c. output voltage 
and the ripple factor with 
RL 
 of 100 SI 
and capacitor filter of 100012F are 
207 V and 0.028 
325 V and 0 • 028 
207 V and 0.020 
325 V and 0.020 
3. The effect of reduction in effective base 
width due to increase in reverse voltage 
of BJT is 
Hall effect 
Early effect 
Zener effect 
Miller effect 
4. What is the drain current for a 
D-MOSFET having the characteristic 
values IDss of 10 mA, V asmo  of —4 V 
and Il Ds  of + 2 V? 
22.5 mA 
17•5 mA 
12•5 mA 
2•5 mA  
non-inverting op-amp 
feedback op-amp 
high-gain op-amp 
6. What is the frequency of oscillation for an 
RC phase-shift oscillator with R of 10 Icfl 
and C of 0.001 µF in each of its three 
RC sections? 
5.0 kHz 
5.5 kHz 
6 • 0 kHz 
(d) 5.5 kHz 
7. When there is no clock signal applied to 
CMOS logic circuits, they are referred 
to as 
complex CMOS logic circuits 
static CMOS logic circuits 
NMOS transmission gates 
random PMOS logic circuits 
8. One form of NMOS circuit logic that 
minimizes power dissipation and 
maximizes device density is called 
pass transistor logic 
sequential logic circuit 
NMOS SRAM cell 
NMOS transmission gate 
VBY—S—ELX/51A 	 2 
Page 3


evineatg Service (I
)
) Examy2019 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
T.B.C. : VBY—S—ELX 	 Test Booklet Series 
Serial No. 
TEST BOOKLET 
004 GO 85 
ELECTRONICS AND TELECOMMUNICATION 
ENGINEERING 
Time Allowed : Three Hours 
	 Maximum Marks: 300 
INSTRUCTIONS 
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK 
THAT THIS TEST BOOKLET DOES NOT 
HAVE ANY UNPRINTED OR TORN OR MISSING PAGES 
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET. 
Please note that it is the candidate's responsibility to encode and fill in the Roll Number 
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at 
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render 
the Answer Sheet liable for rejection. 
You have to enter your Roll Number on the Test Booklet in 
the Box provided alongside. DO NOT write anything else on 
the Test Booklet. 
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers). 
You will select the response which you want to mark on the Answer Sheet. In case you feel that 
there is more than one correct response, mark the response which you consider the best. In any 
case, choose ONLY ONE response for each item. 
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in 
the Answer Sheet. 
All items carry equal marks. 
Before you proceed to mark in the Answer Sheet the response to various items in the Test 
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you 
with your Admission Certificate. 
After you have completed filling in all your responses on the Answer Sheet and the examination 
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted 
to take away with you the Test Booklet. 
Sheets for rough work are appended in the Test Booklet at the end. 
Penalty for wrong answers : 
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE. 
There are four alternatives for the answer to every question. For each question for which a 
wrong answer has been given by the candidate, 
one-third (0.33) of the marks assigned to 
that question will be deducted as penalty. 
If a candidate gives more than one answer, it will be treated as a 
wrong answer even if one of 
the given answers happens to be correct and there will be same penalty as above to that 
question. 
If a question is left blank, i.e., no answer is given by the candidate, there will be 
no penalty 
for that question. 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
(I) 
5. In the Wien bridge oscillator, the 00 
phase-shift is met by using lead-lag 
network and by using 
(a) inverting op-amp 
1. Consider a common-emitter current gain 
of p = 150 and a base current of 
in  = 15 µA. If the transistor is biased in 
the forward active mode, the collector 
and emitter current will be 
2.25 mA and 2.27 mA 
3.25 mA and 2.27 mA 
2.25 mA and 1•37 mA 
3.25 mA and 1•37 mA 
2. The input to a bridge rectifier is 230 V 
(r.m.s.), 50 Hz. The d.c. output voltage 
and the ripple factor with 
RL 
 of 100 SI 
and capacitor filter of 100012F are 
207 V and 0.028 
325 V and 0 • 028 
207 V and 0.020 
325 V and 0.020 
3. The effect of reduction in effective base 
width due to increase in reverse voltage 
of BJT is 
Hall effect 
Early effect 
Zener effect 
Miller effect 
4. What is the drain current for a 
D-MOSFET having the characteristic 
values IDss of 10 mA, V asmo  of —4 V 
and Il Ds  of + 2 V? 
22.5 mA 
17•5 mA 
12•5 mA 
2•5 mA  
non-inverting op-amp 
feedback op-amp 
high-gain op-amp 
6. What is the frequency of oscillation for an 
RC phase-shift oscillator with R of 10 Icfl 
and C of 0.001 µF in each of its three 
RC sections? 
5.0 kHz 
5.5 kHz 
6 • 0 kHz 
(d) 5.5 kHz 
7. When there is no clock signal applied to 
CMOS logic circuits, they are referred 
to as 
complex CMOS logic circuits 
static CMOS logic circuits 
NMOS transmission gates 
random PMOS logic circuits 
8. One form of NMOS circuit logic that 
minimizes power dissipation and 
maximizes device density is called 
pass transistor logic 
sequential logic circuit 
NMOS SRAM cell 
NMOS transmission gate 
VBY—S—ELX/51A 	 2 
9. The ideal op-amp has 	 12. The light intensity 3 m from a lamp that 
emits 25 W of light energy will be 
1 
infinite voltage gain and zero input 
impedance 
infinite voltage gain and infinite 
bandwidth 
zero voltage gain and infinite CMRR 
zero output impedance and zero 
CMRR 
10. A d.c. voltage supply provides 60 V 
when the output is unloaded. When 
connected to a load, the output drops 
to 56 V. The value of the voltage 
regulation is 
 3.7% 
 5.7% 
 7.1% 
 9.1% 
11. In optical communication, the maximum 
angle in which external light rays may 
strike the air/glass interface and still 
propagate down the fiber is called as 
critical angle 
numerical aperture 
angle of refraction 
acceptance angle  
243 mW/m 2  
232 mW/m 2  
221 mW/m 2  
210 mW/m 2  
13. Two resistances, one of 30 Q and another 
of unknown value, are connected in 
parallel. The total power dissipated 
in the circuit is 450 W when the 
applied voltage is 90 V. The unknown 
resistance is 
45.Q 
35Q 
30Q 
20Q 
14. An electric kettle contains 1. 5 kg of water 
at 15 °C. It takes 15 minutes to raise 
the temperature of water to 95 °C. If the 
heat loss due to radiations and heating 
the kettle is 15 kcalories and the 
supply voltage is 100 V, the current 
taken will be 
8. 0 A 
7 • 1 A 
6. 3 A 
5 -4 A 
VBY-S-ELX/ 51A 
	 3 	 [ P.T.O. 
Page 4


evineatg Service (I
)
) Examy2019 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
T.B.C. : VBY—S—ELX 	 Test Booklet Series 
Serial No. 
TEST BOOKLET 
004 GO 85 
ELECTRONICS AND TELECOMMUNICATION 
ENGINEERING 
Time Allowed : Three Hours 
	 Maximum Marks: 300 
INSTRUCTIONS 
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK 
THAT THIS TEST BOOKLET DOES NOT 
HAVE ANY UNPRINTED OR TORN OR MISSING PAGES 
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET. 
Please note that it is the candidate's responsibility to encode and fill in the Roll Number 
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at 
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render 
the Answer Sheet liable for rejection. 
You have to enter your Roll Number on the Test Booklet in 
the Box provided alongside. DO NOT write anything else on 
the Test Booklet. 
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers). 
You will select the response which you want to mark on the Answer Sheet. In case you feel that 
there is more than one correct response, mark the response which you consider the best. In any 
case, choose ONLY ONE response for each item. 
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in 
the Answer Sheet. 
All items carry equal marks. 
Before you proceed to mark in the Answer Sheet the response to various items in the Test 
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you 
with your Admission Certificate. 
After you have completed filling in all your responses on the Answer Sheet and the examination 
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted 
to take away with you the Test Booklet. 
Sheets for rough work are appended in the Test Booklet at the end. 
Penalty for wrong answers : 
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE. 
There are four alternatives for the answer to every question. For each question for which a 
wrong answer has been given by the candidate, 
one-third (0.33) of the marks assigned to 
that question will be deducted as penalty. 
If a candidate gives more than one answer, it will be treated as a 
wrong answer even if one of 
the given answers happens to be correct and there will be same penalty as above to that 
question. 
If a question is left blank, i.e., no answer is given by the candidate, there will be 
no penalty 
for that question. 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
(I) 
5. In the Wien bridge oscillator, the 00 
phase-shift is met by using lead-lag 
network and by using 
(a) inverting op-amp 
1. Consider a common-emitter current gain 
of p = 150 and a base current of 
in  = 15 µA. If the transistor is biased in 
the forward active mode, the collector 
and emitter current will be 
2.25 mA and 2.27 mA 
3.25 mA and 2.27 mA 
2.25 mA and 1•37 mA 
3.25 mA and 1•37 mA 
2. The input to a bridge rectifier is 230 V 
(r.m.s.), 50 Hz. The d.c. output voltage 
and the ripple factor with 
RL 
 of 100 SI 
and capacitor filter of 100012F are 
207 V and 0.028 
325 V and 0 • 028 
207 V and 0.020 
325 V and 0.020 
3. The effect of reduction in effective base 
width due to increase in reverse voltage 
of BJT is 
Hall effect 
Early effect 
Zener effect 
Miller effect 
4. What is the drain current for a 
D-MOSFET having the characteristic 
values IDss of 10 mA, V asmo  of —4 V 
and Il Ds  of + 2 V? 
22.5 mA 
17•5 mA 
12•5 mA 
2•5 mA  
non-inverting op-amp 
feedback op-amp 
high-gain op-amp 
6. What is the frequency of oscillation for an 
RC phase-shift oscillator with R of 10 Icfl 
and C of 0.001 µF in each of its three 
RC sections? 
5.0 kHz 
5.5 kHz 
6 • 0 kHz 
(d) 5.5 kHz 
7. When there is no clock signal applied to 
CMOS logic circuits, they are referred 
to as 
complex CMOS logic circuits 
static CMOS logic circuits 
NMOS transmission gates 
random PMOS logic circuits 
8. One form of NMOS circuit logic that 
minimizes power dissipation and 
maximizes device density is called 
pass transistor logic 
sequential logic circuit 
NMOS SRAM cell 
NMOS transmission gate 
VBY—S—ELX/51A 	 2 
9. The ideal op-amp has 	 12. The light intensity 3 m from a lamp that 
emits 25 W of light energy will be 
1 
infinite voltage gain and zero input 
impedance 
infinite voltage gain and infinite 
bandwidth 
zero voltage gain and infinite CMRR 
zero output impedance and zero 
CMRR 
10. A d.c. voltage supply provides 60 V 
when the output is unloaded. When 
connected to a load, the output drops 
to 56 V. The value of the voltage 
regulation is 
 3.7% 
 5.7% 
 7.1% 
 9.1% 
11. In optical communication, the maximum 
angle in which external light rays may 
strike the air/glass interface and still 
propagate down the fiber is called as 
critical angle 
numerical aperture 
angle of refraction 
acceptance angle  
243 mW/m 2  
232 mW/m 2  
221 mW/m 2  
210 mW/m 2  
13. Two resistances, one of 30 Q and another 
of unknown value, are connected in 
parallel. The total power dissipated 
in the circuit is 450 W when the 
applied voltage is 90 V. The unknown 
resistance is 
45.Q 
35Q 
30Q 
20Q 
14. An electric kettle contains 1. 5 kg of water 
at 15 °C. It takes 15 minutes to raise 
the temperature of water to 95 °C. If the 
heat loss due to radiations and heating 
the kettle is 15 kcalories and the 
supply voltage is 100 V, the current 
taken will be 
8. 0 A 
7 • 1 A 
6. 3 A 
5 -4 A 
VBY-S-ELX/ 51A 
	 3 	 [ P.T.O. 
15. A heater element is made of nichrome 
wire having resistivity equal to 
100 x 10-8  Q m and diameter of 
0.4 ram. The length of the wire 
required to get a resistance of 40 Q 
will be nearly 
9m 
7  m 
5 m 
3 m 
16. A car is travelling at 72 km/h. If the 
length of an axle is 2 m and the vertical 
component of the earth's magnetic field 
is 40 ab/m2, the e.m.f. generated in 
the axle of the car is 
2 6 mV 
2.2 mV 
1- 6 mV 
1.2 mV  
18. An inductor of 0•S H inductance and 
90 Q resistance is connected in parallel 
with a 20 AF capacitor. A voltage of 
230 V at 50 Hz is maintained across the 
circuit. The total power taken from the 
source is nearly 
 588 W 
 145W 
 135 W 
 125 W 
19. A 240 V shunt motor with the armature 
resistance of 0.1 Q runs at 850 r.p.m. 
for an armature current of 70 A. If its 
speed is to be reduced to 650 r.p.m., the 
resistance to be placed in series for an 
armature current of 50 A is nearly 
 082Q 
 1 14 Q 
 124Q 
 1. 34 Q 
17. In a telephone receiver, the size of each of 
the two poles is 1.2 cm x 0.2 cm and 
the flux between each pole and the 
diaphragm is 3 x 10-8  Wb. The force 
attracted to the poles will be nearly 
0.15 N 
0.20 N 
0. 30 N 
0.40 N  
20. A 200 V d.c. shunt motor with armature 
resistance of 0.2 £1 and carrying a 
current of 50 A is running at 960 r.p.m. 
If the flux is reduced by 10% at constant 
torque and with negligible iron and 
friction losses, the speed will be nearly 
1280 r.p.m. 
1170 r.p.m. 
1100 r.p.m. 
1060 r.p.m. 
VBY-S-ELX/51A 	 4 
Page 5


evineatg Service (I
)
) Examy2019 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
T.B.C. : VBY—S—ELX 	 Test Booklet Series 
Serial No. 
TEST BOOKLET 
004 GO 85 
ELECTRONICS AND TELECOMMUNICATION 
ENGINEERING 
Time Allowed : Three Hours 
	 Maximum Marks: 300 
INSTRUCTIONS 
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK 
THAT THIS TEST BOOKLET DOES NOT 
HAVE ANY UNPRINTED OR TORN OR MISSING PAGES 
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET. 
Please note that it is the candidate's responsibility to encode and fill in the Roll Number 
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at 
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render 
the Answer Sheet liable for rejection. 
You have to enter your Roll Number on the Test Booklet in 
the Box provided alongside. DO NOT write anything else on 
the Test Booklet. 
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers). 
You will select the response which you want to mark on the Answer Sheet. In case you feel that 
there is more than one correct response, mark the response which you consider the best. In any 
case, choose ONLY ONE response for each item. 
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in 
the Answer Sheet. 
All items carry equal marks. 
Before you proceed to mark in the Answer Sheet the response to various items in the Test 
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you 
with your Admission Certificate. 
After you have completed filling in all your responses on the Answer Sheet and the examination 
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted 
to take away with you the Test Booklet. 
Sheets for rough work are appended in the Test Booklet at the end. 
Penalty for wrong answers : 
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE. 
There are four alternatives for the answer to every question. For each question for which a 
wrong answer has been given by the candidate, 
one-third (0.33) of the marks assigned to 
that question will be deducted as penalty. 
If a candidate gives more than one answer, it will be treated as a 
wrong answer even if one of 
the given answers happens to be correct and there will be same penalty as above to that 
question. 
If a question is left blank, i.e., no answer is given by the candidate, there will be 
no penalty 
for that question. 
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO 
(I) 
5. In the Wien bridge oscillator, the 00 
phase-shift is met by using lead-lag 
network and by using 
(a) inverting op-amp 
1. Consider a common-emitter current gain 
of p = 150 and a base current of 
in  = 15 µA. If the transistor is biased in 
the forward active mode, the collector 
and emitter current will be 
2.25 mA and 2.27 mA 
3.25 mA and 2.27 mA 
2.25 mA and 1•37 mA 
3.25 mA and 1•37 mA 
2. The input to a bridge rectifier is 230 V 
(r.m.s.), 50 Hz. The d.c. output voltage 
and the ripple factor with 
RL 
 of 100 SI 
and capacitor filter of 100012F are 
207 V and 0.028 
325 V and 0 • 028 
207 V and 0.020 
325 V and 0.020 
3. The effect of reduction in effective base 
width due to increase in reverse voltage 
of BJT is 
Hall effect 
Early effect 
Zener effect 
Miller effect 
4. What is the drain current for a 
D-MOSFET having the characteristic 
values IDss of 10 mA, V asmo  of —4 V 
and Il Ds  of + 2 V? 
22.5 mA 
17•5 mA 
12•5 mA 
2•5 mA  
non-inverting op-amp 
feedback op-amp 
high-gain op-amp 
6. What is the frequency of oscillation for an 
RC phase-shift oscillator with R of 10 Icfl 
and C of 0.001 µF in each of its three 
RC sections? 
5.0 kHz 
5.5 kHz 
6 • 0 kHz 
(d) 5.5 kHz 
7. When there is no clock signal applied to 
CMOS logic circuits, they are referred 
to as 
complex CMOS logic circuits 
static CMOS logic circuits 
NMOS transmission gates 
random PMOS logic circuits 
8. One form of NMOS circuit logic that 
minimizes power dissipation and 
maximizes device density is called 
pass transistor logic 
sequential logic circuit 
NMOS SRAM cell 
NMOS transmission gate 
VBY—S—ELX/51A 	 2 
9. The ideal op-amp has 	 12. The light intensity 3 m from a lamp that 
emits 25 W of light energy will be 
1 
infinite voltage gain and zero input 
impedance 
infinite voltage gain and infinite 
bandwidth 
zero voltage gain and infinite CMRR 
zero output impedance and zero 
CMRR 
10. A d.c. voltage supply provides 60 V 
when the output is unloaded. When 
connected to a load, the output drops 
to 56 V. The value of the voltage 
regulation is 
 3.7% 
 5.7% 
 7.1% 
 9.1% 
11. In optical communication, the maximum 
angle in which external light rays may 
strike the air/glass interface and still 
propagate down the fiber is called as 
critical angle 
numerical aperture 
angle of refraction 
acceptance angle  
243 mW/m 2  
232 mW/m 2  
221 mW/m 2  
210 mW/m 2  
13. Two resistances, one of 30 Q and another 
of unknown value, are connected in 
parallel. The total power dissipated 
in the circuit is 450 W when the 
applied voltage is 90 V. The unknown 
resistance is 
45.Q 
35Q 
30Q 
20Q 
14. An electric kettle contains 1. 5 kg of water 
at 15 °C. It takes 15 minutes to raise 
the temperature of water to 95 °C. If the 
heat loss due to radiations and heating 
the kettle is 15 kcalories and the 
supply voltage is 100 V, the current 
taken will be 
8. 0 A 
7 • 1 A 
6. 3 A 
5 -4 A 
VBY-S-ELX/ 51A 
	 3 	 [ P.T.O. 
15. A heater element is made of nichrome 
wire having resistivity equal to 
100 x 10-8  Q m and diameter of 
0.4 ram. The length of the wire 
required to get a resistance of 40 Q 
will be nearly 
9m 
7  m 
5 m 
3 m 
16. A car is travelling at 72 km/h. If the 
length of an axle is 2 m and the vertical 
component of the earth's magnetic field 
is 40 ab/m2, the e.m.f. generated in 
the axle of the car is 
2 6 mV 
2.2 mV 
1- 6 mV 
1.2 mV  
18. An inductor of 0•S H inductance and 
90 Q resistance is connected in parallel 
with a 20 AF capacitor. A voltage of 
230 V at 50 Hz is maintained across the 
circuit. The total power taken from the 
source is nearly 
 588 W 
 145W 
 135 W 
 125 W 
19. A 240 V shunt motor with the armature 
resistance of 0.1 Q runs at 850 r.p.m. 
for an armature current of 70 A. If its 
speed is to be reduced to 650 r.p.m., the 
resistance to be placed in series for an 
armature current of 50 A is nearly 
 082Q 
 1 14 Q 
 124Q 
 1. 34 Q 
17. In a telephone receiver, the size of each of 
the two poles is 1.2 cm x 0.2 cm and 
the flux between each pole and the 
diaphragm is 3 x 10-8  Wb. The force 
attracted to the poles will be nearly 
0.15 N 
0.20 N 
0. 30 N 
0.40 N  
20. A 200 V d.c. shunt motor with armature 
resistance of 0.2 £1 and carrying a 
current of 50 A is running at 960 r.p.m. 
If the flux is reduced by 10% at constant 
torque and with negligible iron and 
friction losses, the speed will be nearly 
1280 r.p.m. 
1170 r.p.m. 
1100 r.p.m. 
1060 r.p.m. 
VBY-S-ELX/51A 	 4 
21. Which of the following statements are 	 23. Which of the following statements are 
correct for d.c. shunt motor? 	 correct for a fully charged lead-acid cell? 
Speed of a shunt motor is 
sufficiently constant. 
For the same current input, its 
starting torque is not as high as 
that of a series motor. 
The motor can be directly coupled 
to a load such as a fan whose 
torque increases with speed. 
Select the correct answer using the code 
given below. 
2 and 3 only 
1 and 3 only 
1 and 2 only 
1, 2 and 3 
22. Consider the following materials : 
Lead peroxide 
Sponge lead 
Dilute sulphuric acid  
Gassing occurs at both electrodes. 
The terminal voltage is 2 6 V. 
The specific gravity of the 
electrolyte is 1.21. 
Select the correct answer using the code 
given below. 
1 and 2 only 
1 and 3 only 
2 and 3 only 
1, 2 and 3 
24. Which of the following statements are 
correct for synchronous motors? 
Synchronous motors are well-
suited for direct connection to 
reciprocating compressors. 
Over-excited synchronous motors 
are most commonly used for power 
factor improvement. 
Synchronous motors are generally 
used for current regulation of long 
transmission lines. 
Which of the above are active materials 
of a lead-acid battery? 
1 and 2 only 
1 and 3 only 
2 and 3 only 
1, 2 and 3 
Select the correct answer using the code 
given below. 
1, 2 and 3 
1 and 3 only 
1 and 2 only 
2 and 3 only 
VBY-S-ELX/51A 
	 5 	 [ P.T.O.