DC Generators Multiple Choices Questions and Answers DC Generators MCQ

DC GENERATORS MCQ

This DC Generator MCQ (Multiple Choice Questions) quiz is carefully designed for engineering students, diploma holders, and electrical professionals preparing for competitive exams, interviews, or academic tests. It covers all essential topics such as construction, working principle, EMF equation, armature reaction, and types of DC generators.

Use this quiz to:

Reinforce your understanding of DC generators.

Test your conceptual and numerical knowledge.

Prepare for exams like GATE, SSC JE, RRB, UPSC, PSU interviews, and university exams.

How Field winding of a excited DC generator will be powered?

Residial magnetism

By Armature winding

No DC power required

External DC supply

None

Whiich one of the following is not a type of DC Generator

Compound

Series

Shunt

Induction

None

Iron losses in DC machines occur at ____________.

Armature

Commutator

Terminals

Poles

None

Find the induced EMF in a DC machine with P poles, Z number of conductors, operating at N revolutions per minute.

$ \frac{P \phi NZ}{60 A} $

$ \frac{P \phi Z}{60} $

$ \frac{P \phi Z}{A} $

$ \frac{P \phi Z}{60 A} $

None

The EMF equation of DC generated expressed as

e = B?LN

e= V - IR

$\frac{P?NZ}{60 A}$

e = PN

None

In a DC machine, the current flow is ______________ in nature.

DC Current

Pulsating current

Alternating current

Saw tooth current

None

In a DC machine, the generated EMF is proportional to __________.

Amount of flux cuts by conductor

Speed of the Armature

Both Amount of flux cuts by conductor and Speed of the armature

External load connected with DC machine

None

Silicon steel laminations are used in the armature core of a DC machine because __________.

to reduce friction and wind age losses

to reduce hysteresis losses

To reduce copper losses

to reduce eddy current losses

None

The component of a DC machine that rotates is called the ____________

Yoke

Rotor

stator

Armature

None

10.

The fundamental working principle of a DC generator is

Faraday's laws of Electro magnetic induction

Kirchoff's law

Ampere current law

Lenz's Law

None

11.

Which one of the following part is DC generator convers AC supply into DC supply

Stator Winding

Commutator

Both stator and armature windings

Armature winding

None

12.

Which type of DC generator has field winding connected in parallel with the armature

Shunt generator

Differential compound generator

Compound generator

Series generator

None

13.

What is the important effect occurs during armature reaction in a DC Generator

Terminal voltage increases

Field current increases

Armature current increases

Distortion of main magnetic field

None

14.

Let $\phi$ be the flux per pole in a DC machine. Find the average flux available in the yoke

$1.1 \phi$

$0.5 \phi$

$\phi$

$1.2 \phi$

None

15.

A DC machine?s yoke is typically manufactured from _______________.

Good magnetic materials

Poor Magnetic materials

Mica

Plastics

None

16.

Find the induced EMF in a DC machine with P poles, Z number of conductors, operating at N revolutions per minute.

$\frac{P \phi Z}{60} $

$\frac{P \phi Z}{A} $

$\frac{P \phi NZ}{60 A} $

$\frac{P \phi Z}{60 A} $

None

17.

Carbon brushes in a DC machine serve the purpose of ____________

Holding the armature

Providing path to electric current

As a brake

Prevent Sparking

None

18.

The function of brushes used in DC generator

Collect current from the armature

For smooth rotaion of armature

Support for armature

Supply Current to field winding

None

19.

The efficienvy of DC Generator is maximum when

Variable losses = constant losses

constan losses in equal to zero

Mechanical losses = Iron losses

Iron losses = copper losses

None

20.

Assuming the flux in the air gap of a DC machine is $\phi$, state the flux through the armature winding

$0.8 \phi$

$\frac{\phi}{2}$

$1.2 \phi$

$\phi$

None

21.

Hysterisis losses and Eddy current losses classified under following category

Stray Losses

Copper Losses

Iron Losses

Mechanical Losses

None

1 out of 3

Name

Time's up

DC GENERATORS MCQ

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