# 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

1.s

2.s2

3.s3

4.s4

1.6.45 W

2.6.01 W

3.6.78 W

4.6.98 W

1.1

2.2

3.3

4.4

1.10

2.20

3.30

4.40

## 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

1..019 ?

2..036 ?

3..075 ?

4..084 ?

## 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

1.20

2.40

3.30

4.10

1.9.98

2.9.71

3.9.12

4.9.37

1.418.56

2.420.12

3.421.23

4.422.45

1.40.2

2.46.1

3.40.1

4.40.6

1.1.086

2.1.042

3.1.214

4.1.876

1.0.054

2.0.047

3.0.039

4.0.018

1.22 W

2.14 W

3.45 W

4.0 W

1.1.535 W

2.0 W

3.2.484 W

4.1.598 W

1.65 W

2.0 W

3.68 W

4.64 W

1.89 W

2.41 W

3.0 W

4.48 W

1.710

2.715

3.716

4.718

1.0.287

2.0.27

3.0.287

4.0.216

1.0

2.78 V

3.15 V

4. 85 V

1.?=?s

2.?=2?s

3.?=4?s

4.?=8?s

1.29.44 A

2.24.64 A

3.23.48 A

4.26.56 A

1.77.9 V

2.77.6 V

3.77.2 V

4.77.8 V

1.46 V

2.47 V

3.45 V

4.78 V

1.0.66

2.0.33

3.0.44

4.0.99

1.3.124 kgm2

2.3.125 kgm2

3.4.545 kgm2

4.5.552 kgm2

1.29.69 V

2.48.74 V

3.69.23 V

4.25.74 V

1.0ï¿½

2.10ï¿½

3.80ï¿½

4.90ï¿½

1.0.8

2.0.4

3.0.6

4.1

1.1.5 VAR

2.2.6 VAR

3.0 VAR

4.1.9 VAR

1.1.221 VAR

2.2.611 VAR

3.0 VAR

4.1.997 VAR

1.2 sec

2.4 sec

3.5 sec

4.3 sec

1.8 sec

2.4 sec

3.7 sec

4.3 sec

1.2 sec

2.3 sec

3.4 sec

4.1 sec

1.0 W

2.2 W

3.1.5 W

4..3 W

1.98 W

2.92 W

3.91 W

4.93 W

1.13.77 W

2.12.56 W

3.46.45 W

4.13.98 W

1.1

2.0.4

3.0.1

4.0.6

1.0

2.0.4

3.0.2

4.0.1

1.0 Hz

2.50 Hz

3.49 Hz

4.60 Hz

1.14.28 sec

2.14.31 sec

3.14.23 sec

4.14.78 sec

1.-20%

2.-40%

3.-60%

4.-80%

1.1.7

2.2.7

3.3.7

4.4.7

1.1

2.2

3.3

4.4

1.41

2.42

3.43

4.44

1.77.5

2.77.6

3.76.9

4.77.1

1.77.5

2.77.6

3.76.9

4.77.1

1.Nï¿½Ia

2.Nï¿½Ia2

3.Nï¿½Ia3

4.Nï¿½Ia.5

1.Ia

2.Ia2

3.Ia3

4.Iao

## 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

## 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

1.72 V

2.56 V

3.12 V

4.33 V

1.1.49 V

2.1.56 V

3.1.12 V

4.1.78 V

1.149.19 V

2.156.23 V

3.116.57 V

4.178.64 V

1.33.94 V

2.33.56 V

3.33.12 V

4.33.78 V

## 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

1.30 V

2.40 V

3.70 V

4.20 V

## 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

1.Zero

2.< Ns

3.> Ns

4.Ns

1.90ï¿½

2.40ï¿½

3.50ï¿½

4.68ï¿½

1..6-.8

2..1-.2

3..2-.4

4..5-.7

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

3.Low at the light and heavy loads both

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

3.Low at the light and heavy loads both

1.Zero

2.< Ns

3.> Ns

4.Ns

1..247 ?

2..345 ?

3..231 ?

4..222 ?

1.1.47 ?

2.1.81 ?

3.0 ?

4.4.12 ?

1.0.452 ?

2.0.462 ?

3.0.752 ?

4.0.712 ?

1..81 ?

2..36 ?

3..75 ?

4..84 ?

1.16 ?

2.26 ?

3.25 ?

4.44 ?

1.R2ï¿½X2

2.4R2ï¿½X2

3.2R2ï¿½X2

4.R2ï¿½3X2

1.m

2.m/s

3.atm/m

4.Volt

## More MCQS

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