Behaviour of Synchronous Motor On Loading - MCQs

Behaviour of Synchronous Motor On Loading - MCQs

Q1. With increase in load, the speed of synchronous motor

a. Increases
b. Decreases
c. Remains constant
d. None of the above

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Q2. Back emf in case of synchronous motor depends on the

a. Excitation given to the field winding
b. Speed
c. Both (a) and (b)
d. None of the above

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Q3. If the load on a synchronous motor increases then its

a. Current drawn by motor increases and load angle decreases
b. Current drawn by motor decreases and load angle remains constant
c. Current drawn by motor remains constant and load angle increases
d. Current drawn by motor increases and load angle also increases

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Q4. In a synchronous motor the torque produced will be maximum when load angle is equal to

a. 0° electrical
b. 90° electrical
c. 180° electrical
d. 360° electrical

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Q5. Practically in a synchronous motor, the pull-out torque will occur when the torque angle is nearly equal to

a. 30° electrical
b. 45 ° electrical
c. 60 ° electrical
d. 75 ° electrical

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Q6. For a synchronous motor, as the load angle reaches up to 90 ° electrical i.e. half a pole pitch, then the magnetic locking between the stator and rotor

a. No longer exist
b. Will be strongest
c. Will be weakest
d. None of these

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Q7. The impedance angle or internal machine angle (°) of a synchronous motor is equal to

a. tan^-1X_s / R_a
b. tan^-1 R_s / X_a
c. tan^-1 X_s / Z_a
d. tan^-1 Z_s / R_a

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