Top 150+ Solved DC Generators MCQ Questions Answer
Q. In a D.C. generator in case the resistance of the field winding is increased, then outputvoltage will
a. increase
b. decrease
c. remain unaffected
d. fluctuate heavily
Q. An exciter for a turbo generator is a
a. separately excited generator
b. shunt generator
c. series generator
d. compound generator
Q. In case of a flat compounded generator
a. voltage generated is less than the rated voltage
b. generated voltage is proportional to the load on the generator
c. voltage remains constant irrespec¬tive of the load
d. speed varies in proportion to the load on the generator
Q. Which of the following generator will have negligible terminal voltage while running onno-load ?
a. Series generator
b. Shunt generator
c. Compound generator
d. Separately excited generator
Q. Which of the following D.C. generators will be in a position to build up without anyresidual magnetism in the poles ?
a. Series generator
b. Shunt generator
c. Compound generator
d. None of the above
Q. In over compounded generator, full load terminal voltage is
a. almost zero
b. less than noload terminal voltage
c. more than noload terminal voltage
d. equal to no-load terminal voltage
Q. In a level compounded D.C. generator, full load terminal voltage is
a. negligibly low
b. equal to no-load terminal voltage
c. more than no-load terminal voltage
d. less than no-load terminal voltage
Q. The terminal voltage of a D.C. shunt generator drops on load because of all of thefollowing reasons except
a. armature reaction
b. armature resistance drop
c. field weakening due to armature reaction and armature
d. commutation
Q. In a D.C. generator
a. external resistance = internal char-acteristic - armature reaction
b. internal characteristic = magnetisation characteristic - ohmic drop
c. external characteristic = magnetisation characteristic - ohmic drop - armature reaction
d. magnetisation characteristic = external characteristic
Q. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armaturevoltage wave
a. will be zero
b. will be of 5 Hz
c. willbeof5xiVHz
d. will be of v Hz 5
Q. A 220 V D.C. generator is run at full speed without any excitation. The open circuitvoltage will be
a. zero
b. about 2 V
c. about 50 V
d. 220 V
Q. In a separately excited generator supplying rated load the armature reaction ,
a. is always present
b. is always absent
c. may be sometimes present
d. none of the above
Q. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed willbe
a. zero
b. small
c. the same as rated voltage
d. high
Q. Armature reaction in a generator results in
a. demagnetisation of leading pole tip and magnetisation of trailing pole tip
b. demagnetisation of trailing pole tip and magnetisation of leading pole tip
c. damagnetising the centre of all poles
d. magnetising the centre of all poles
Q. Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
a. Series field
b. Compensating field
c. Inter pole field
d. Shunt field