36. If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is
37. In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
38. If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
39. Synchronous motors are generally not self-starting because
40. The synchronous motor is not inherently self-starting because
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