Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. Q. In DOL starter NO(Normally open) contact is used as
a. start push button
b. stop push button
c. a and b
d. none of the above
Q. In DOL starter NC(Normally closed) contact is used as
a. start push button
b. stop push button
c. a and b
d. none of the above
Q. The advantage of Autotransformer starter over stator resistance starter is
a. produces more torque
b. produces less losses
c. smooth variation of speed
d. none of the above
Q. The rotor speed of a 6 pole 50Hz induction motor is 960 r.p.m. The percentage slip is ____.
a. 0.03
b. 0.04
c. 0.05
d. 0.02
Q. The torque developed in an induction motor is nearly proportional to
a. 1/v
b. v
c. v^2
d. none of these
Q. The air gap between the stator and rotor of a 3 phase induction motor ranges from
a. 2 cm to 4 cm
b. 0.4mm to 4mm
c. 1cm to 2cm
d. 4cm to 6cm
Q. A 4 pole, 440V, 50Hz induction motor is running at a slip of 4%. The speed of motor is ____.
a. 1260 rpm
b. 1440rpm
c. 1500rpm
d. 1560rpm
Q. A 4 pole, 50Hz induction motor runs at a speed of 1440rpm. The frequency of the rotor induced emf is _____.
a. 3hz
b. 2.5hz
c. 2hz
d. 1hz
Q. The torque of 3 phase induction motor depends on__.
a. part of rotating magnetic field reacting with stator
b. rotor current is running condition
c. rotor power factor in running condition
d. all of these
Q. The constant 'k' in the torque equation of a 3 phase induction motor depends
a. supply voltage
b. rotor current in running condition
c. synchronous speed
d. all of these