Electrical Machines Objective Questions
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The results of a slip test for determining direct axis (X_{d}) and quadrature axis (X_{q}) reactances of a star connected salient pole alternator are given below Phase values: V_{max} = 108 V ; V_{min} = 96 V I_{max} = 12 A ; I_{min} = 10 A Hence the two reactances will be
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Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?
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For a 3phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be
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Universal motors are used in
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In which of the following motors DC excitation is not required?
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Synchronising power of a synchronous motor varies
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In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then
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In a synchronous motor torque or load angle δ  with increase in load
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In synchronous motor the torque is proportional to
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Which of the following motor has more stability
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Stepper motor is used in
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The synchronous reactance( Xs) is the
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The leakage reactance of a 3phase alternator is determined by performing
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Stability of a synchronous motor  with the increase in excitation.
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In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will
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In synchronous generator V curve is drawn between
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When excitation is increased (over excitation), the synchronous generator operates at
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Slip test is performed to determine
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Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?
Correct!
Wrong!

Number of slip rings in 3phase synchronous motor will be
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In synchronous generator, inverted V curve is drawn between
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Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?
Correct!
Wrong!

A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?
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Damper winding is used to
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Reactive power generated or delivered significantly depends on
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Maximum power developed by a synchronous motor depends on
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Synchronous reactance of an alternator represents
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In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased
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Synchronous condensers are used to
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Which of the following statement is correct, if short circuit ratios is high
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