TECHNICAL APTITUDE
Q1:- For highest power gain, what configuration is used
(1) CC (2) CE (3) CB (4) CS
Answer :-2
Q2:- An SCR has ...... PN junctions
(1) Two (2) Four
(3) Three (4) One
Answer :-3
Answer :-3
Q3:- A pole pitch in electrical machine is
(1) Equal to 180° electrical
(2) Equal to 180° mechanical
(3) Less than 180° electrical
(4) Greater than 180° electrical
Answer :-1
(2) Equal to 180° mechanical
(3) Less than 180° electrical
(4) Greater than 180° electrical
Answer :-1
Q4:-Which of the following compensator will increase the bandwidth of the system
(1) Phase lag
(2) Phase lead
(3) Lag-lead
(4) None of these
Answer :-1
(2) Phase lead
(3) Lag-lead
(4) None of these
Answer :-1
Q5:-To increase power transfer capability of a long transmission line, we should:
(1) Increase line resistance
(2) Increase transmission voltage
(3) Decrease line reactance
(4) Both (2) & (3)
Answer :-4
Q6:-The instantaneous voltage and current across a load is v = 50 sin given by v = 50 sin (314 t–π/6) volts and i = 10 sin (314 t–π/6) amperes, respectively. The active power consumed by the load is:
Q6:-The instantaneous voltage and current across a load is v = 50 sin given by v = 50 sin (314 t–π/6) volts and i = 10 sin (314 t–π/6) amperes, respectively. The active power consumed by the load is:
(1) 500 watts
(2) 125 watts
(3) 1000 watts
(4) None of these
Answer :-2
(4) None of these
Answer :-2
Q7:- Drop in alternator frequency is corrected by:
(1) Damper winding
(2) Increased prime mover output
(3) Automatic voltage regulator
(4) None of these
Answer :-2
Answer :-2
Q8:-In a galvanometer, the deflection becomes one half
when the galvanometer is shunted by a 20 ohm resistor. The galvanometer resistance is:
(1) 5 ohm
(2) 10 ohm
(3) 40 ohm
(4) 20 ohm
(4) 20 ohm
Answer :-2
Q9:-In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is:
(1) 400 Hz
(2) 800 Hz
(3) 1200 Hz
(4) None of these
Answer :-3
Q10:-Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:
(1) 1
(2) 0.5
(3) 0.75
(4) 0.33
Answer :-2
Q11:- Which of the following are constant losses in Transformers?
(1) Winding losses
(2) Core losses
(3) Both Winding & core losses
(4) None of these
Answer :-2
Q12:-Deep bar rotor construction is used in three phase induction motors to mainly:
(1) Control speed
(2) Control power factor
(3) Increase starting torque
(4) None of these
Answer :-3
Q13:- Two transformers with identical voltage ratings are working in parallel to supply common load. The percentage impedance of one transformer is higher compared to that of other. The load sharing between the two transformer will:
(1) Be proportional to their percentage impedance
(2) Be independent of their percentage impedance
(3) Be inversely proportional to their respective impedance
(4) Depend on the resistance to leakage reactance ratio of each transformer
Answer :-3
Q14:- Number of comparators required for an 8 bit flash ADC is:
(1) 8
(2) 16
(3) 255
(4) 256
Answer :-3
Q15:- A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance R. A voltmeter having a resistance of 1.2 kΩ is connected across 600 ohm resistances and reads 5 V. The value of resistance R shall be:
(1) 1.2 kΩ
(2) 2.4 kΩ
(3) 120 kΩ
(4) 400 kΩ
Answer :-2
Q16:- A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is:
(1) Slip frequency
(2) Supply frequency
(3) Frequency corresponding to rotor speed
(4) Zero
Answer :-1
Q17:- From source Vs= 200cosωt, a load draws current Im=2.5 at power factor 0.6 lagging. The load impedance is
(1) 48+64j
(2) 40 +50j
(3) 30+64j
(4) 48+ 50j
Answer :-1
Q18:-Two capacitor C1 and C2 have C1=20µF and C2= 30µF C2= 30µF are connected in parallel across a 100V source. The net capacitance of the circuit is?
(1) 50 µF
(2) 10 µF
(3) 12 µF
(4) 60µµ
Answer :-1
Q19:-Power-factor of industrial arc and induction furnace is:
(1) High lagging
(2) High leading
(3) Low lagging
(4) Very low lagging
Answer :-4
Q20:-A 100mA meter has accuracy of ± 2%. Its accuracy while reading 50mA will be:
(1) ± 1%
(2) ± 2%
(3) ± 4%
(4) ± 20%
Answer :-3
Q9:-In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is:
(1) 400 Hz
(2) 800 Hz
(3) 1200 Hz
(4) None of these
Answer :-3
Q10:-Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:
(1) 1
(2) 0.5
(3) 0.75
(4) 0.33
Answer :-2
Q11:- Which of the following are constant losses in Transformers?
(1) Winding losses
(2) Core losses
(3) Both Winding & core losses
(4) None of these
Answer :-2
Q12:-Deep bar rotor construction is used in three phase induction motors to mainly:
(1) Control speed
(2) Control power factor
(3) Increase starting torque
(4) None of these
Answer :-3
Q13:- Two transformers with identical voltage ratings are working in parallel to supply common load. The percentage impedance of one transformer is higher compared to that of other. The load sharing between the two transformer will:
(1) Be proportional to their percentage impedance
(2) Be independent of their percentage impedance
(3) Be inversely proportional to their respective impedance
(4) Depend on the resistance to leakage reactance ratio of each transformer
Answer :-3
Q14:- Number of comparators required for an 8 bit flash ADC is:
(1) 8
(2) 16
(3) 255
(4) 256
Answer :-3
Q15:- A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance R. A voltmeter having a resistance of 1.2 kΩ is connected across 600 ohm resistances and reads 5 V. The value of resistance R shall be:
(1) 1.2 kΩ
(2) 2.4 kΩ
(3) 120 kΩ
(4) 400 kΩ
Answer :-2
Q16:- A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is:
(1) Slip frequency
(2) Supply frequency
(3) Frequency corresponding to rotor speed
(4) Zero
Answer :-1
Q17:- From source Vs= 200cosωt, a load draws current Im=2.5 at power factor 0.6 lagging. The load impedance is
(1) 48+64j
(2) 40 +50j
(3) 30+64j
(4) 48+ 50j
Answer :-1
Q18:-Two capacitor C1 and C2 have C1=20µF and C2= 30µF C2= 30µF are connected in parallel across a 100V source. The net capacitance of the circuit is?
(1) 50 µF
(2) 10 µF
(3) 12 µF
(4) 60µµ
Answer :-1
Q19:-Power-factor of industrial arc and induction furnace is:
(1) High lagging
(2) High leading
(3) Low lagging
(4) Very low lagging
Answer :-4
Q20:-A 100mA meter has accuracy of ± 2%. Its accuracy while reading 50mA will be:
(1) ± 1%
(2) ± 2%
(3) ± 4%
(4) ± 20%
Answer :-3
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