Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. ____ motor is most suitable for punch presses
a. shunt
b. series
c. differential compound
d. cumulative compound
Q. In a vaccum cleaner, we generally use ____ motor
a. shunt
b. cumulative - compound
c. series motor
d. differetial compounded
Q. The most suitable motor for elevators is the ___ motor.
a. series
b. shunt
c. differential compound
d. cumulative compound
Q. The friction and windage losses in a DC motor depends upon ____.
a. speed
b. flux
c. armature current
d. field and armature resistance
Q. A motor takes a large starting currents because _____.
a. the armature resistance is high
b. back emf is low
c. shunt field is produce weak field
d. none of the above
Q. Excessive sparking at the brushes may be caused due to _____.
a. dirt on the commutator
b. loose coupling
c. misalignment of machine
d. worn bearing
Q. The armature torque of a DC motor running of 800rpm is 99.3Nm and shaft torque is 93.3Nm. The iron and friction losses are__.
a. 502w
b. 400w
c. 200w
d. 300w
Q. Which motor should not be used for centrifugal pumps?
a. shunt
b. series
c. cumulatively compound
d. differenctially compound
Q. If the applied voltage to a DC machine is 230V, then back emf for maximum power developed is ___.
a. 200v
b. 230v
c. 115v
d. 460v
Q. A DC motor runs at 1725rpm at full load and 1775rpm at no load. The speed regulation is _____.
a. 0.047
b. 0.029
c. 0.076
d. 0.015
Q. The resistance of the shunt field winding as compared to series field winding is ____.
a. less
b. more
c. the same
d. none of the above
Q. The field winding of a machine designed for separate excitation is
a. of the shunt field type
b. of the series field type
c. either of the two
d. none of the above
Q. In a DC compound machine,
a. shunt field winding plays dominent role
b. series field winding plays dominent role
c. either can play dominent role
d. both play equally dominent role
Q. A DC shunt motor is rotating at 267 rad/sec and developing 57.2Nm of torque. How many kilowatts of mechanical power are developed?
a. 9.8kw
b. 15.3kw
c. 17.8kw
d. 11.2kw