Electrical Machines Questions and Answers – Synchronous Motors
Synchronous Motor Phasor Diagram
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From the figure shown below for the OCC and SCC of a three phase alternator, the point ‘L’ corresponds to _______ and the point ‘A’ can be obtained by _____ the alternator.
Correct!
Wrong!

Switched reluctance motors are basically
Correct!
Wrong!

Identify the over excited alternator operating at zpf.
Correct!
Wrong!

Synchronous motor delivers lagging power at
Correct!
Wrong!

For the above graph depicting the performance of a synchronous motor, coordinates ‘x’ and ‘y’ are respectively?
In the ‘V’ curve shown in the above figure for a synchronous motor, the parameter of x and y coordinates are, respectively
In the ‘V’ curve shown in the above figure for a synchronous motor, the parameter of x and y coordinates are, respectively
Correct!
Wrong!

The operating point for an over excited alternator working near zpf lagging power factor gives ‘A’ as the operating point. Then if the same machine is working as an over excited synchronous motor will give same operating point at
Correct!
Wrong!

Below is the phasor diagram of synchronous generator.If the machine is made to run as synchronous motor, what will be the new phasor diagram?
Correct!
Wrong!

We can increase the torque of a reluctance synchronous motor if we
Correct!
Wrong!

Below is the phasor diagram of synchronous generator.If the machine is made to run as synchronous motor, what will be the phasor diagram changes then?
Correct!
Wrong!

The voltage equation of synchronous motor is
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Wrong!

A 420 V synchronous motor is working at 30° lagging load. What can be the expected phasor?
Correct!
Wrong!

The synchronous motor is operating at upf load. The most suitable phasor will be?
Correct!
Wrong!

Identify the over excited synchronous motor operating at zpf.
Correct!
Wrong!

The zero power factor of an alternator can be obtained by _________ at rated Ia.
Correct!
Wrong!

In the figure below, the point ‘F’ corresponds to _______ which can be obtained by ________
Correct!
Wrong!
