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# AE-JE Foundation EE Electrical Machines Revision Quiz

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Question 1

Which of the following is not the method of reducing harmonics?

Question 2

An autotransformer has V1, I1 as input quantities and V2, I2 as output quantities With V2 < V1. The VA transformed from primary to secondary is

Question 3

A synchronous capacitor is

Question 4

A 450V, 50 KVA 1-ϕ alternator has an effective armature resistance of 0.62 Ω. An excitation current of 10A produces 200A armature current on short circuit and an emf 400V on open-circuit. Calculate synchronous reactance

Question 5

Enclosure of motor is made from

Question 6

A three phase, 4-pole and 50 Hz induction motor have rotor copper loss equal to 400 W. The torque developed by the motor at 5% slip will be.

Question 7

A 3-phase induction motor has a full-load slip of 3 percent at normal voltage. What will be the value of slip if it develops the same torque theoretically while operating at 110 percent of normal voltage?

Question 8

For a 3-phase synchronous motor, if air gap is increased, then what will be its effect on voltage regulation?

Question 9

In case of 3- ϕ IM, shaft power is 2700 W and mechanical losses are 180 W. At a slip of 4%, The rotor ohmic losses will be:

Question 10

A stepper motor with stator and rotor teeth of 12 and 10 respectively. The value of single step of stepper motor will be:

Question 11

A 50 kVA, 2200/110V transformer when tested gave S.C. test 90V, 20.5A, 808W (H.V. Side). Calculate the % Voltage regulation at full load with 0.8 p.f. lagging?

Question 12

Potier triangle method is helpful in obtaining the voltage regulation of synchronous machines by determining the armature
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