Construction & Working Principle
Applications
Characteristics
Numerical Type
Identification
100
An induction motor can be said analogous to
Transformer
100
Wound rotor induction motor is most appropriate for the applications requiring____________ starting torque.
Variable
100
A 3-phase induction motor is operating at slip ‘s’. If the slip is reversed, its slip at the instant will be ______
2-s
100
A 50 Hz, 3-phase induction motor has a full load speed of 1440 r.p.m. The number of poles in the motor is
4
100
The below diagram belongs to which motor?
Split-Phase Induction Motor
200
Slip rings are usually made of
Phosphor bronze
200
The torque in an induction motor varies as _______ of the voltage.
Square
200
In a three-phase induction motor, the starting torque is maximum when?
R2 = X2
200
For a 4 pole three phase induction motor having synchronous speed of 1500 rpm is operating at 1450rpm. The frequency of the induced emf in rotor is?
100Hz
200
Torque-speed Characteristics belongs to which motor?
Split-Phase Induction Motor
300
The direction/speed of RMF when a three phase supply is given to stator of three phase induction motor is
Synchronous Speed
300
A shaded Pole induction motor can be used for
Toys, Hair dryers, calculators, Photo Copying machine, record players.
300
In an induction motor, what is the ratio of the rotor copper loss to rotor input?
slip
300
For a 4-pole, 3-phase induction motor the rotor speed found is 2100 rpm at 50 Hz. Then the phase sequence of the emf generated will be?
acb
300
In below Circle Diagram AD represents
Torque Line
400
Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have poorer power factor?
A
400
Split-Phase Induction motors are available in the range of
1/20 to 1/2 KW
400
An induction motor X operating at the slip of 3%. An induction motor Y operating at slip of 40%.
Which motor is stable?
X
400
A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the stator filed with respect to stator structure is?(In rad/sec)
157 rad/sec
400
In below Circle Diagram CD represents
Rotor Cu Loss
500
How a three phase induction motor operates when rotor frequency is equal to stator frequency?
It will not operate
500
Capacitor start induction motors are having _______ starting torque.
High
500
At standstill the equivalent of the 3-phase induction motor is similar to
Short-circuited two winding transformer
500
In a three phase induction motor, voltage between the slip rings at standstill is 50 V. At full load the slip is 0.04. The voltage between slip rings at full load is?
2V
500
The torque slip characteristic of the induction motor is
Identify the slip region.
Low Slip Region