Exam 2: Synchronous Motor: Part B

Which of the following motors is non-self starting ?

In which of the following motors the stator and rotor fields rotate simultaneously ?

The ratio of starting torque to running torque in a synchronous motor is

In a synchronous motor, the maximum power developed depends on all of the following except

In a synchronous motor, the damping winding is generally used to

In a 3-phase synchronous motor, the negative phase sequence exists when the motor is

Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current ?

The maximum speed variation in a 3-phase synchronous motor is

By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

The effect of increasing the load on a synchronous motor running with normal excitation is to

The magnitude of field flux in a 3-phase synchronous motor

The speed of a synchronous motor

In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be

In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on

The torque angle, in a synchronous motor, is the angle between

A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have

In a synchronous motor, V-curves represent relation between

Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?

A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed

In a synchronous motor, damper windings are provided on