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EE- II - UNIT 4 - DC GENERATOR -

Total questions: 35

Worksheet time: 18mins

Name
Class
Date
1.

DC Generator converts --------------------energy into DC ----------energy.

a)

mechanical, electrical

b)

electrical, mechanical

c)

kinetic, mechanical

d)

potential, electrical

2.

DC Generators works on the ---------- principle

a)

Lenz's law

b)

Lorentz Law

c)

ohm's law

d)

Faraday's law of ElectromagneticInduction

3.

DC stands for ----------------------------

a)

direct control

b)

division control

c)

division current

d)

direct current

4.

Yoke is made of -------------material.

a)

silicon steel

b)

carbon steel

c)

Cast iron or cast steel

d)

plastic

5.

EMF equation for DC generator is -------------

a)

Eg = PΦNZ / 120A

b)

Eg = PΦNZ / 60A

c)

Eg = PΦNA / 60Z

d)

Eg = PΦNZ / 160A

6.

Which part is converts AC into DC in the DC generator?

a)

yoke

b)

Brush

c)

Bearings

d)

commutator

7.

The induced current in the DC generator can be found by ---------

a)

Faraday's law

b)

Fleming's Right Hand Rule

c)

Ohm's law

d)

Lowrent'z law

8.

Eg = PΦNZ / 60A what is Z?

a)

Impedance

b)

Armature Conductor

c)

field winding

d)

field coil

9.

RPS stands for ----------------

a)

Revolutions per Second

b)

Revolutions Per Slot

c)

Revolutions per Section

10.

Speed (N) is measured by ------

a)

RPM

b)

second

c)

Minutes

d)

KM

11.

WHICH TYPE OF DC GENERATOR HAS TWO FIELD WINDINGS?

a)

SERIES

b)

SHUNT

c)

COMPOUND

12.

EFFICIENCY OF DC GENERATOR IS RATIO BETWEEN ----- TO----

a)

INPUT POWER,OUTPUT POWER

b)

OUTPUT POWER,INPUT POWER

c)

INPUT GAIN/=,OUTPUT GAIN

13.

MARK THE LOSSES WHICH OCCURS IN DC GENERATOR

a)

COPPER LOSS

b)

IRON LOSS

c)

STRAY LOSS

d)

MECHANICAL LOSS

14.

WHICH IS VARIABLE LOSS?

a)

ARMATURE COPPER LOSS

b)

FIELD COPPER LOSS

c)

BRUSH CARBON RESISTANCE

15.

EFFICIENCY OF RELIABLE DC GENERATOR

a)

90% - 99%

b)

85% - 95%

c)

50% - 69%

d)

70% - 84%

16.

differentiate between self excted and separately excited dc generator

4 lines
17.

explain the concept of commutation

4 lines
18.
Separately excited field generators has 
a)
Permanent magnet 
b)
Electromagnet 
c)
Residual magnetism 
19.
In separately excited field generators, the stator produces its magnetic field 
a)
by external source of dc current 
b)
by current from armature 
c)
by permanent magnets 
20.
In self excited field generators, the stator strengthens its magnetic field 
a)
by external source of dc current 
b)
By current from armature 
c)
By permanent magnet
21.

What it is?

a)

Armature

b)

Commutator

c)

Brush

d)

Magnet

22.

What is the main part shown in the picture?

a)

spring

b)

carbon brush

c)

copper brush

d)

copper lug

23.

This is a....................DC generator

a)

Self Exicted

b)

Seperately Excited

c)

Permanent Magnet

d)

none

24.

According to the ............................self-excited DC generators can be classified .

a)

position of the armature coils

b)

Position of Commutator

c)

position of the field coils

d)

none

25.

This is a....................DC generator

a)

Series Wound

b)

shunt wound

c)

compound wound

d)

none

26.

field coils are internally connected with the armature in .....

a)

none

b)

seperately excited

c)

permanent magnet

d)

self excited

27.

whole current flows through the field coils as well as the load in ........generator

a)

Series Wound

b)

Shunt Wound

c)

Compound Wound

d)

all the above

28.

the voltage in the field winding is same as the voltage across the terminal in ............generator

a)

Series Wound

b)

Shunt Wound

c)

Compound Wound

d)

all the above

29.

Compound wound generators have

a)

series winding

b)

shunt winding

c)

series & shunt winding

d)

none

30.

This is a ...........generator

a)

short shunt compound wound generator

b)

long shunt compound wound generator.

c)

short short compound wound generator.

d)

long long compound wound generator.

31.

In ..............generators ,shunt field winding is in parallel with both series field and armature winding

a)

short shunt compound wound generator

b)

long shunt compound wound generator.

c)

short short compound wound generator.

d)

long long compound wound generator.

32.

Flux due to stator poles called

a)

Main flux

b)

armature flux

c)

both main & armature flux

d)

all the above

33.

Flux due to current in armature called

a)

Main flux

b)

armature flux

c)

both main & armature flux

d)

all the above

34.

ARMATURE REACTION is

a)

none of these

b)

mutual action between armature & stator

c)

mutual action of main field flux on the armature flux

d)

mutual action of armature flux on the main field flux

35.

An exciter for a turbo generator is a

a)

Separately excited DC generator

b)

shunt generator

c)

series generator

d)

compound generator

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