Q.1.
The frame of an induction motor is usually made of
Q.2.
Rotor rheostat control method of speed control is used for
Q.3.
Which of the following component is usually fabricated out of silicon steel ?
Q.4.
A 3-phaseV,Hz induction motor hasslip. The frequency of rotor e.m.f. willbe
Q.5.
In case of 3-phase induction motors, plugging means
Q.6.
If a 3-phase supply is given to the stator and rotor is short circuited rotor will move
Q.7.
The speed characteristics of an induction motor closely resemble the speedloadcharacteristics of which of the following machines
Q.8.
Which type of bearing is provided in small induction motors to support the rotor shaft?
Q.9.
5 H.P., 50-Hz, 3-phase,V, induction motors are available for the following r.p.m.Which motor will be the costliest ?
Q.10.
Which is of the following data is required to draw the circle diagram for an inductionmotor ?
Q.11.
The vafcie of transformation ratio of an induction motor can be found by
Q.12.
The power scale of circle diagram of an induction motor can be found from
Q.13.
In induction motor, percentage slip depends on
Q.14.
The low power factor of induction motor is due to
Q.15.
Temperature of the stator winding of a three phase induction motor is obtained by
Q.16.
The starting torque of a three phase induction motor can be increased by
Q.17.
The circle diagram for an induction motor cannot be used to determine
Q.18.
Blocked rotor test on induction motors is used to find out
Q.19.
Which motor is preferred for use in mines where explosive gases exist ?
Q.20.
The efficiency of an induction motor can be expected to be nearly