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GATE 2022 : Electrical Machines Quiz- 75

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Question 1Multiple Correct Options

Consider the following statements, which of the below statements is/are correct?

Question 2

For a coil, each turn faces (2t4 – t3 – 2t) milliwebers of flux. The value of induced EMF in coil for 100 turns coil at 2 sec is, (in Volts).

Question 3

A commutator rotates at 800 rpm and has diameter of 0.5 m. If width of brush is 1.5 cm, then time of commutation in msec is ______.

Question 4

A 50 kW, 50 Hz, 4 Pole, slip ring induction motor has a full load slip of 0.If its mechanical losses are 5% of the output, then full load electromagnetic torque is______Nm.

Question 5Multiple Correct Options

A 6-pole, 50 Hz, 3-phase, Induction motor running on full load develops a useful Torque of 160 Nm and the rotor emf is observed to make 120 cycle/min. Choose the correct option:

Question 6Multiple Correct Options

A 240 V series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. Then find what resistance must be added to obtain rated torque at starting and back emf (Eb) at starting.
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Posted by:

Chetan GoyalChetan GoyalMember since Mar 2021
AIR 1805, GATE2021
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