Electrical Drives MCQ

Welcome to your Electrical Drives MCQ

Which of the following are electrical braking methods ?

plugging

dynamic

regenerative

all of the above

None

Which braking is not possible in series motor?

Regenerative braking

Dynamic braking

Counter current braking

Rheostat braking

None

Polarity of supply voltage is reversed in which type of braking?

Regenerative braking

Dynamic braking

Plugging

None of these

None

Full form of VVVF control

variable voltage VAr frequency

VAr variable voltage frequency

variable VAr voltage frequency

variable voltage variable frequency

None

What type electric drive is used in cranes?

Multimotor

Group

Individual

Both A and C

None

Electric drive is becoming more and more popular because

all of below

it provide smooth and easy control

it is cheaper in cost

it is simple and reliable

None

The basic elements of a electric drive are

Electric motor

Control system

Electrical motor and control system

None of the above

None

Speed control by variation of field flux results in

Constant power drive

Constant torque drive

Variable power drive

None of the above

None

High braking torque produced in

plugging.

dynamic braking.

regenerative braking.

none of above.

None

10.

Which speed control method preferred for constant torque drive?

Field control

Armature voltage control

Mechanical loading system

None of above

None

11.

While operating on variable frequency supplies, the AC motor requires variable voltage in order to

protect the insulation

avoid effect of saturation

improve the capabilities of the inverter

protect thyristor from dV / dt

None

12.

Which of the following motor can be referred as a universal motor?

Permanent magnet motor

DC shunt motor

DC series motor

DC compound motor

None

13.

What is the unit of the apparent or complex power?

ohm

Volt

VAR

None

14.

Which of the following are used in preventing the hunting phenomenon in synchronous generators?

Damper winding

Distributed winding

Short pitch chords

Damper bars

None

15.

Which one of the following methods would give a lower than the actual value of regulation of the alternator?

EMF method

ASA method

ZPF method

MMF method

None

16.

What is the unit of the distance?

atm/m

Volt

m/s

None

17.

Which of the following is the correct abbreviation of IFOC?

Insight field oriented control

Indirect field oriented control

Inverter field oriented control

Isolated field oriented control

None

18.

Which starting method is the best method in Induction motor?

Reactance starting

Direct online starting

Star-Delta starting

Autotransformer starting

None

19.

Which of the following motor is a 1-Φ AC motor?

Shunt motor

Capacitor run

Series motor

Synchronous motor

None

20.

Which of the following test is used to determine the conditions where electric motors are being used?

Seismography

Anthropology

Thermography

Geography

None

21.

Which of the following motor is used in recording instruments?

DC motor

Synchronous motor

Induction motor

Reluctance motor

None

22.

Which of the following is used to protect SCR from thermal conditions?

Voltage clamping device

Snubber circuit

Heat sink

Zener diode

None

23.

Which one of the element is used to make R load commutating?

Coil

Resistor

Capacitor

Inductor

None

24.

Current Chopping is most severe in which of the following?

Vacuum Circuit Breaker

Air Blast Circuit Breaker

Oil Circuit Breaker

Air Break Circuit Breaker

None

25.

Which of the following type of grounding is used to suppress the capacitive effect?

Reactance grounding

Peterson coil

Solid grounding

Resistance grounding

None

1 out of 25

Electrical Drives MCQ

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