Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. The torque developed by a 3-phase induction motor during starting
a. depends on rotor induced emf during starting
b. rotor induced emf during running condition
c. does not depend on rotor induced emf
d. none of these
Q. Condition for maximum torque developed during starting by a three phase induction motor is
a. r2 = x2
b. r2 =s x2
c. r2 /s x2
d. x2/r2
Q. Condition for maximum torque developed during running by a three phase induction motor is
a. r2 = x2
b. r2 =s x2
c. r2 /s x2
d. x2/r2
Q. Starting torque depends on
a. rotor resistance and rotor reactance during starting
b. supply voltage
c. both 1 and 2
d. none of these
Q. Torque developed by three phase induction motor
a. depends on power factor of rotor
b. depends on power factor of stator
c. does not depend on on power factor of rotor or stator
d. both 1 and 2
Q. The power factor of induction motor is during running condition
a. depend on slip
b. is independent of slip
c. rotor reactance
d. both b and c
Q. The torque developed by three phase induction motor depends on following three factors
a. speed, frequency, number of poles
b. voltage, current and stator impedance
c. synchronous speed, rotor speed and frequency
d. rotor emf, rotor current and rotor p.f
Q. When load is placed in three phase induction motor, its speed
a. decreases
b. increases
c. remains unchanged
d. becomes zero
Q. When load is connected to three phase induction motor is increased, then its slip
a. decreases
b. increases
c. remains unchanged
d. becomes zero
Q. When load is connected to three phase induction motor is increased, then its rotor induced emf
a. decreases
b. increases
c. remains unchanged
d. becomes zero
Q. When load is placed in three phase induction motor its current
a. decreases
b. increases
c. remains unchanged
d. becomes zero
Q. When load is placed in three phase induction motor, its torque
a. decreases
b. increases
c. remains unchanged
d. becomes zero
Q. Maximum torque during running condition developed by three phase induction motor can be obtained by changing rotor resistance
a. in squirrel cage type motor
b. in slip ring type motor
c. in both 1 and 2
d. none of these
Q. There is no electrical connection between stator and rotor, still power is transffered from stator to rotor through
a. magnetic flux
b. air
c. water
d. conductor