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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 (2t

^{4}– t^{3}– 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 (E

_{b}) at starting.- 365 attempts
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Jul 14ESE & GATE EE

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