Practice 1000 Electric Drives Multiple Choice Questions with Answers Quiz-1

Q.1.

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

a) Permanent magnet motor
b) DC shunt motor
c) DC series motor
d) DC compound motor

Explanation

Q.2.

What is an electric drive?

a) A machine that converts electrical energy into kinetic energy
b) A machine that converts mechanical energy into electrical energy
c) A machine that converts electrical energy into mechanical energy
d) A machine that converts kinetic energy into electrical energy

Q.3.

Which of the following is used to build a electric drive?

a) Source
b) Motor
c) Control unit
d) All of the mentioned

Q.4.

Which of the following is/are components of an electric drive?

a) Control unit and Power Modulator
b) Electric Motor and Control System
c) Input Command
d) Sensing Device and Electric Motor

Q.5.

Which of the following is a function of electric drive?

a) Transport energy from the storage system to the wheels
b) Transport energy from the control system to the wheels
c) Transport fuel from the electric motor to the wheels
d) Transport fuel from the storage system to the wheels

Q.6.

What are electric drives?

a) Engines of 2-wheelers
b) Laptops
c) Robotics
d) Both a & c

Q.7.

Which of the following exhibits linearly rising load torque characteristics?

a) Rolling Mills
b) Fan load
c) Separately excited dc generator connected to the resistive load
d) Elevators

Explanation

Q.8.

Type-A chopper is used for obtaining which type of mode?

a) Reverse motoring mode
b) Motoring mode
c) Reverse regenerative braking mode
d) Regenerative braking mode

Explanation

Q.9.

Which of the following converter circuit operations will be unstable for a large duty cycle ratio?

a) Boost converter
b) Boost converter and Buck-Boost converter
c) Buck converter
d) Buck-Boost converter

Q.10.

Which of the following devices should be used as a switch for high power and high voltage application?

a) TRIAC
b) Thyristor
c) GTO
d) MOSFET

Explanation

Q.11.

What is the unit of the apparent or complex power?

a) VA
b) ohm
c) Volt
d) VAR

Explanation

Q.12.

Which of the following device is NOT suitable for parallel operation?

a) BJT
b) MOSFET
c) TRIAC
d) IGBT

Q.13.

The frame of an induction motor is made of _________

a) Silicon steel
b) Aluminum
c) Stainless steel
d) Cast iron

Explanation

Q.14.

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

a) Distributed winding
b) Damper bars and short pitch chords
c) Short pitch chords
d) Damper bars

Explanation

Q.15.

Which of the following core has linear characteristics?

a) CRGO core
b) Iron core
c) Air core
d) Steel core

Explanation

Q.16.

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

a) EMF method
b) ASA method
c) ZPF method
d) MMF method

Explanation

Q.17.

The most suitable control-motor application is __________

a) AC one-phase induction motor
b) DC shunt motor
c) AC shunt motor
d) DC separately motor

Q.18.

What is the unit of the distance?

a) atm/m
b) Volt
c) m
d) m/s

Explanation

Q.19.

In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will ___________

a) Decrease
b) First increases then decrease
c) Increase
d) Remain unchanged

Explanation

Q.20.

Which of the following is the unit of displacement?

a) m/s
b) m
c) atm/m
d) Volt

Explanation

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