300 Important DC Generator MCQ Question and Answer | PDF Free Download
1.In a dc shunt generator, the voltage build up is generally restricted due to
- AArmature heating
- BInsulation restriction
- CSaturation of iron
- DSpeed limitation
2.The Voltage regulation of an ideal dc generator is
- AZero
- B10
- C25
- D100
3.The terminal voltage of an over compounded dc generator
- ADecreases with the increase in load current
- BIncreases with the increase in load current
- CRemain constant at all load currents
- DNone of the above
4.In a dc compound generator, “flat compound” characteristic required for certain application, this may be obtained by connecting a variable resistance
- AAcross the series filed
- BIn series with the series filed
- CIn parallel with the shunt filed
- DIn series with the shunt field
5.A cumulatively compounded dc generator is supplying 98610 A at 200 V Now if the series field winding is short circuited the terminal voltage
- AWill remain unaltered at 200 V
- BWill rise to 220 V
- CWill shoot up to a very high value
- DWill become less than 200V
6.A dc generator will be flat compounded if
- AIts terminal voltage remains constant irrespective of the load current supplied by the generator
- BGenerated voltage is in proportion to load current
- CThe generator is capable of producing higher voltage at light load
- DTerminal voltage increases slightly with the load
7.Over or under compounding of a dc generator is achieved by
- AShunting more or less current from the shunt filed
- BShunting more or less current from the series field
- CConnecting is as long shunt
- DConnecting it as short shunt
8.An over compounded dc generator is supplying 800A at full load on 500 V. The resistance of each conductor is 0.02 ohm. The percentage of compounding is
- A1.6%
- B3.2%
- C6.4%
- D12.8%
9.Which of the following dc generator is will be in a position to build up without any residual magnetism in the field?
- ASeries
- BShunt
- CSeparately excited
- DCompound
10.Which of the following dc generator has rising V-I characteristics?
- ASeries
- BShunt
- CCompound
- DNone
11.Which of the following dc generator will have negligible terminal voltage on no load?
- AShunt
- BSeries
- CCompound
- DNone
12.An exciter for turbo generator is a dc ________ generator.
- Ashunt
- Bseries
- Ccompound
- Dseparately excited
13.For a specific open circuit voltage of a dc generator, the short circuit current will be maximum when it is
- ASeparately excited
- BShunt connected
- CCumulatively compounded
- DDifferentially compounded
14.The voltage regulation of a dc generator at full load being zero implies that the generator is
- AShunt connected
- BDifferentially compounded
- CCumulatively compounded
- DSeries connected
15.which of the DC generator has the poorest voltage regulation?
- AShunt
- BOver compounded
- CUnder compounded
- DDifferential compounded
16.The voltmeter connected across a generator reads voltage same at no load and at full load (rated) This generator is a
- AShunt generator
- BSeries generator
- CLevel compound
- DShort shunt compound
17.A dc shunt generator when driven without connecting filed winding shows an open circuit terminal voltage of 12 V. When filed winding is connected and excited the terminal voltage drops to zero because
- AField resistance is higher than critical resistance
- BThere is no residual magnetism in the filed circuit
- CFiled winding has got wrongly connected
- DThere is a fault in armature circuit
18.The residual magnetism of a dc shunt generator can be regained by
- AConnecting the shunt field to a battery
- BRunning the generator on no load for some time
- CGrounding the shunt field
- DReversing the direction of rotation of the generator
19.Flashing of field of dc generator means
- ANeutralization of residual magnetism
- BCreation of residual magnetism by a dc source
- CIncreasing flux density by providing extra ampere turns in field
- DNone of the above
20.A dc series generator is employed
- AAs a booster to maintain constant voltage at the load end of the feeder
- BFor supplying traction load
- CFor supplying industrial load at constant voltage
- DFor battery charging