23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open а. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because
23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open а. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because
Chapter51: Electric And Electronic Braking
Section: Chapter Questions
Problem 2SQ: Differentiate between the AC and DC magnetic fields applied to an induction motor stator.
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Transcribed Image Text:23. When the circuit breaker is always tripping, most likely
There is an overloading
c. The supply line are open
a.
b.
There is an over current
d. The load is removed
24. The synchronous motor is not inherently self- starting because
the rotating magnetic field does not have enough poles
b. the rotating magnetic field is produced by only 50 HZ frequency currents
the force required to accelerate the rotor is to the synchronous speed in an instant is
d. the starting devices to accelerate the rotor to near synchronous speed is absent
25. Synchronous motor has speed
a. slight drop in speed on full load
b.high speed at low torque
а.
с.
c. constant speed
d. low speed at high -
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