# Engineering/Electric Drives MCQ Questions and Answers Sample Test,Sample questions

## Question: ` A 3-phase induction machine draws active power P and reactive power Q from the grid. If it is operated as a generator then P and Q will be _________`

1.Positive and Negative

2.Negative and Positive

3.Positive and Positive

4.Negative and Negative

Posted Date:-2021-10-31 07:35:15

## Question: ` At low values of slip the electromagnetic torque is directly proportional to ___________`

1.s

2.s2

3.s3

4.s4

Posted Date:-2021-10-31 07:35:15

## Question: ` Calculate the total heat dissipated in a rotor resistor of 14.23 ? when .65 A current flows through it.`

1.6.45 W

2.6.01 W

3.6.78 W

4.6.98 W

Posted Date:-2021-10-31 07:35:15

## Question: ` If induction motor air gap power is 2 KW and mechanically developed power is 1 KW then rotor ohmic loss will be _________ KW.7. `

1.1

2.2

3.3

4.4

Posted Date:-2021-10-31 07:35:15

## Question: ` If induction motor air gap power is 48 KW and gross developed power is 28 KW then rotor ohmic loss will be _________ KW.`

1.10

2.20

3.30

4.40

Posted Date:-2021-10-31 07:35:15

## Question: ` In the rotor voltage injection method when an external voltage source is in phase with the main voltage then speed will ___________`

1.Increase

2.Decrease

3.Remain unchanged

4.First increases then decrease

Posted Date:-2021-10-31 07:35:15

## Question: ` The slope of the V-I curve is 1.1ï¿½. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.`

1..019 ?

2..036 ?

3..075 ?

4..084 ?

Posted Date:-2021-10-31 07:35:15

## Question: ` What is the formula for the maximum active power in the cylindrical rotor synchronous machine? (Eb represents armature emf Vt represents terminal voltage ? represents rotor angle X represents reactance)`

1.Ebï¿½Vtï¿½sin?ï¿½X

2.Ebï¿½Vt2ï¿½X

3.Eb2ï¿½Vtï¿½sin?ï¿½X

4.Ebï¿½Vtï¿½X

Posted Date:-2021-10-31 07:35:15

## Question: `A 16-pole 3-phase 60 Hz induction motor is operating at a speed of 150 rpm. The frequency of the rotor current of the motor in Hz is __________`

1.20

2.40

3.30

4.10

Posted Date:-2021-10-31 07:35:15

## Question: `A 2-pole 3-phase ______ Hz induction motor is operating at a speed of 550 rpm. The frequency of the rotor current of the motor in Hz is 2.`

1.9.98

2.9.71

3.9.12

4.9.37

Posted Date:-2021-10-31 07:35:15

## Question: `A 20-pole 3-phase 90 Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20.`

1.418.56

2.420.12

3.421.23

4.422.45

Posted Date:-2021-10-31 07:35:15

## Question: `A 32-pole 3-phase 70 Hz induction motor is operating at a speed of 112 rpm. The frequency of the rotor current the motor in Hz is __________`

1.40.2

2.46.1

3.40.1

4.40.6

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate mark to space ratio if the system is on for 26.3 sec and off for 24.2 sec.`

1.1.086

2.1.042

3.1.214

4.1.876

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate mark to space ratio if the system is on for 4.3 sec and off for 78.2 sec.`

1.0.054

2.0.047

3.0.039

4.0.018

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the active power in a .154 H inductor.`

1.22 W

2.14 W

3.45 W

4.0 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the active power in a .89 H inductor.`

1.1.535 W

2.0 W

3.2.484 W

4.1.598 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the active power in a 168.12 H inductor.`

1.65 W

2.0 W

3.68 W

4.64 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the active power in an 8.12 F capacitor.`

1.89 W

2.41 W

3.0 W

4.48 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the amplitude of the sinusoidal waveform `

1.710

2.715

3.716

4.718

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the amplitude of the sinusoidal waveform z(t)=.27sin(.369?t+.142?ï¿½4.25).`

1.0.287

2.0.27

3.0.287

4.0.216

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the average value of the sinusoidal waveform x(t)=848sin(1.65?t+2?ï¿½0.68).`

1.0

2.78 V

3.15 V

4. 85 V

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the condition for maximum voltage regulation in the synchronous machine.`

1.?=?s

2.?=2?s

3.?=4?s

4.?=8?s

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the line current in the delta connection when phase current=17 A.`

1.29.44 A

2.24.64 A

3.23.48 A

4.26.56 A

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the line voltage in star connection when phase voltage=45 V.`

1.77.9 V

2.77.6 V

3.77.2 V

4.77.8 V

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the line voltage in the delta connection when phase voltage=45 V.`

1.46 V

2.47 V

3.45 V

4.78 V

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the maximum value of slip when rotor resistance is 2 ? and rotor reactance is 3 ?.`

1.0.66

2.0.33

3.0.44

4.0.99

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the moment of inertia of the sphere having a mass of 8.4 kg and radius of 61 cm.`

1.3.124 kgm2

2.3.125 kgm2

3.4.545 kgm2

4.5.552 kgm2

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the peak value of sinusoidal waveform if the r.m.s value is 21 V.29.69 V`

1.29.69 V

2.48.74 V

3.69.23 V

4.25.74 V

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the power factor angle during the resonance condition.`

1.0ï¿½

2.10ï¿½

3.80ï¿½

4.90ï¿½

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the power factor if the power angle is 36.86ï¿½.`

1.0.8

2.0.4

3.0.6

4.1

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the reactive power in a 2.2 ? resistor.`

1.1.5 VAR

2.2.6 VAR

3.0 VAR

4.1.9 VAR

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the reactive power in a 7.2545 ? resistor.`

1.1.221 VAR

2.2.611 VAR

3.0 VAR

4.1.997 VAR

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the time period of the waveform i(t)=sin(?t+6?ï¿½4)+sin(?t+5?ï¿½6).`

1.2 sec

2.4 sec

3.5 sec

4.3 sec

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the time period of the waveform v(t)=12sin(8?t+8?ï¿½15)+144sin(2?t+?ï¿½6)+ 445sin(?t+7?ï¿½6).`

1.8 sec

2.4 sec

3.7 sec

4.3 sec

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the time period of the waveform z(t)=24sin(?t+?ï¿½4)+4sin(2?t+?ï¿½6).`

1.2 sec

2.3 sec

3.4 sec

4.1 sec

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the total heat dissipated in a resistor of 44 ? when 0 A current flows through it.`

1.0 W

2.2 W

3.1.5 W

4..3 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the total heat dissipated in a resistor of 50 ? when 1.4 A current flows through it.`

1.98 W

2.92 W

3.91 W

4.93 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the total heat dissipated in a rotor resistor of 21 ? when .81 A current flows through it.`

1.13.77 W

2.12.56 W

3.46.45 W

4.13.98 W

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the value of the duty cycle if the system is on for 1 sec and off for 0 sec.1`

1.1

2.0.4

3.0.1

4.0.6

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the value of the duty cycle if the system is on for 5 sec and off for inf sec.12. `

1.0

2.0.4

3.0.2

4.0.1

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the value of the frequency of the AC supply in India.`

1.0 Hz

2.50 Hz

3.49 Hz

4.60 Hz

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the value of the time period if the frequency of the signal is .07 sec.`

1.14.28 sec

2.14.31 sec

3.14.23 sec

4.14.78 sec

Posted Date:-2021-10-31 07:35:15

## Question: `Calculate the voltage regulation in the synchronous machine if the no-load voltage is 12 V and the full load voltage is 15V.`

1.-20%

2.-40%

3.-60%

4.-80%

Posted Date:-2021-10-31 07:35:15

## Question: `If induction motor air gap power is 1.8 KW and gross developed power is .1 KW then rotor ohmic loss will be _________ KW.`

1.1.7

2.2.7

3.3.7

4.4.7

Posted Date:-2021-10-31 07:35:15

## Question: `If induction motor air gap power is 10 KW and mechanically developed power is 8 KW then rotor ohmic loss will be _________ KW.`

1.1

2.2

3.3

4.4

Posted Date:-2021-10-31 07:35:15

## Question: `If induction motor air gap power is 67 KW and mechanically developed power is 26 KW then rotor ohmic loss will be _________ KW.`

1.41

2.42

3.43

4.44

Posted Date:-2021-10-31 07:35:15

## Question: `If induction motor rotor power is 157.5 KW and gross developed power is 79.9 KW then rotor ohmic loss will be _________ KW.`

1.77.5

2.77.6

3.76.9

4.77.1

Posted Date:-2021-10-31 07:35:15

## Question: `If induction motor rotor power is 157.5 KW and gross developed power is 79.9 KW then rotor ohmic loss will be _________ KW.`

1.77.5

2.77.6

3.76.9

4.77.1

Posted Date:-2021-10-31 07:35:15

## Question: `In a DC series motor the e.m.f developed is proportional to _______`

1.Nï¿½Ia

2.Nï¿½Ia2

3.Nï¿½Ia3

4.Nï¿½Ia.5

Posted Date:-2021-10-31 07:35:15

## Question: `In a DC shunt motor the e.m.f developed is proportional to ___________`

1.Ia

2.Ia2

3.Ia3

4.Iao

Posted Date:-2021-10-31 07:35:15

## Question: `In the chopper circuit commutation times are _______`

1.Current commutation is equal to voltage commutation

2.Current commutation is less as compared to that of voltage commutation

3.Current commutation is more as compared to that of voltage commutation

4.Both commutation techniques are not comparable

Posted Date:-2021-10-31 07:35:15

## Question: `In the rotor voltage injection method when an external voltage source is in opposite phase with the main voltage then speed will ___________`

1.Increase

2.Decrease

3.Remain unchanged

4.First increases then decrease

Posted Date:-2021-10-31 07:35:15

## Question: `R.M.S value of the periodic square waveform of amplitude 72 V.`

1.72 V

2.56 V

3.12 V

4.33 V

Posted Date:-2021-10-31 07:35:15

## Question: `R.M.S value of the sinusoidal waveform q(t)=2.11cos(87.25t+78?ï¿½478.23).`

1.1.49 V

2.1.56 V

3.1.12 V

4.1.78 V

Posted Date:-2021-10-31 07:35:15

## Question: `R.M.S value of the sinusoidal waveform v(t)=211sin(7.25t+7?ï¿½78.3).`

1.149.19 V

2.156.23 V

3.116.57 V

4.178.64 V

Posted Date:-2021-10-31 07:35:15

## Question: `R.M.S value of the sinusoidal waveform V=48sin(6.5?t+89?ï¿½46.8).`

1.33.94 V

2.33.56 V

3.33.12 V

4.33.78 V

Posted Date:-2021-10-31 07:35:15

## Question: `The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______`

1.Efficiency is higher

2.Power factor is higher

3.Slip is larger

4.Starting current is lower

Posted Date:-2021-10-31 07:35:15

## Question: `The generated e.m.f from 4-pole armature having 1 conductors driven at 1 rev/sec having flux per pole as 10 Wb with wave winding is ___________`

1.30 V

2.40 V

3.70 V

4.20 V

Posted Date:-2021-10-31 07:35:15

## Question: `The most suitable control-motor application is __________`

1.AC shunt motor

2.DC separately motor

3.AC one-phase induction motor

4.DC shunt motor

Posted Date:-2021-10-31 07:35:15

## Question: `The no-load circuit test on a 3-? induction motor is conducted at a rotor speed of _______`

1.Zero

2.< Ns

3.> Ns

4.Ns

Posted Date:-2021-10-31 07:35:15

## Question: `The phase difference between voltage and current in the choke coil.`

1.90ï¿½

2.40ï¿½

3.50ï¿½

4.68ï¿½

Posted Date:-2021-10-31 07:35:15

## Question: `The power factor of a squirrel cage induction motor generally is ___________`

1..6-.8

2..1-.2

3..2-.4

4..5-.7

Posted Date:-2021-10-31 07:35:15

## Question: `The power factor of a squirrel cage induction motor is ___________`

3.Low at the light and heavy loads both

Posted Date:-2021-10-31 07:35:15

## Question: `The power factor of a squirrel cage induction motor is ___________`

3.Low at the light and heavy loads both

Posted Date:-2021-10-31 07:35:15

## Question: `The short circuit test on a 3-? induction motor is conducted at a rotor speed of _______`

1.Zero

2.< Ns

3.> Ns

4.Ns

Posted Date:-2021-10-31 07:35:15

## Question: `The slope of the V-I curve is 13.89ï¿½. Calculate the value of resistance.`

1..247 ?

2..345 ?

3..231 ?

4..222 ?

Posted Date:-2021-10-31 07:35:15

## Question: `The slope of the V-I curve is 180o. Calculate the value of resistance. The graph is parallel to the x-axis.9. `

1.1.47 ?

2.1.81 ?

3.0 ?

4.4.12 ?

Posted Date:-2021-10-31 07:35:15

## Question: `The slope of the V-I curve is 35.48ï¿½. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.`

1.0.452 ?

2.0.462 ?

3.0.752 ?

4.0.712 ?

Posted Date:-2021-10-31 07:35:15

## Question: `The slope of the V-I curve is 39.1ï¿½. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.`

1..81 ?

2..36 ?

3..75 ?

4..84 ?

Posted Date:-2021-10-31 07:35:15

## Question: `The slope of the V-I curve is 9.1ï¿½. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.`

1.16 ?

2.26 ?

3.25 ?

4.44 ?

Posted Date:-2021-10-31 07:35:15

## Question: `The value of slip at which maximum torque occurs ________`

1.R2ï¿½X2

2.4R2ï¿½X2

3.2R2ï¿½X2

4.R2ï¿½3X2

Posted Date:-2021-10-31 07:35:15

## Question: `What is the unit of the distance?`

1.m

2.m/s

3.atm/m

4.Volt

Posted Date:-2021-10-31 07:35:15

## More MCQS

##### R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!