Synchronous Motors
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

pull-up torque
None of these
pull-out torque
pull-in torque

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Synchronous Motors
As the load is applied to a synchronous motor, the motor takes more armature current because

The rotor by shifting its phase backward causes motor to take more current
The increased load has to take more current
The back e.m.f. decreases causing an increase in motor current
The rotor strengthens the rotating field causing more motor current

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