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GATE EE 2021 : Electrical Machines Quiz 7
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Question 1
Which of the following statement is incorrect w.r.t synchronous generators?
Question 2
A synchronous motor is:
Question 3
A 3-phase synchronous motor has 12 poles and operates from 440 V, 50 Hz supply. If it takes a line current of 100 A at 0.8 power factor leading, its speed and torque are nearly
Question 4
A 3-phase, 50 Hz, 8-pole alternator has a star-connected winding with 120 slots and 8 conductors per slot. The flux per pole is 0.05 Wb, sinusoidally distributed. The line voltage is
Question 5
A 3-phase, 16-pole synchronous generator has a resultant air-gap flux of 0.06 Wb per pole. The stator has 2 slots per pole per phase and 4 conductors per slot are accommodated into layers. The coil span is 150o electrical. The ratio of the pitch factor to distribution factor is ____.
Question 6
A alternator is running overexcited with Ef = 1.35 p.u. This machine has synchronous reactance of 1.1 p.u is delivering a synchronous power of 0.7 p.u to the bus bar.
If the prime mover torque is increased by 3% , than % change in the reactive power output of the generator will be _____________
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Oct 10ESE & GATE EE
