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AE 2019 || Day 12 || Electrical Machines Quiz 4

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Question 1

The field flux method of speed control of dc shunt motor is generally used for which one of the following ?

Question 2

A 400V D.C. shunt motor takes 5A at no-load. Ra = 0.5 ohms, Ri = 200 ohms. What is the ratio of speed from full load to no-load, when the D.C. shunt motor lakes 50 A on full load?

Question 3

A transformer may have negative voltage regulation if the load power factor (p.f.) is

Question 4

A cumulative compound dc motor runs at 1500 rpm on full load. If its series field is short circuited, its speed

Question 5

Increasing the air-gap of a squirrel-cage induction motor would result in

Question 6

What are the signs of load angle in an alternator during generator and motor operations, respectively?

Question 7

What is the core loss in a high frequency ferrite core transformer used in SMPS power supply?

Question 8

A starting torque of 80 Nm is developed in an induction motor by an auto-transformer starter with a tapping of 30%. If the tapping of auto-transformer starter is 60%, then what is the starting torque?

Question 9

A 4-pole dc generator is running at 1500 rpm. The frequency of current in the armature winding is

Question 10

A 2300/230 V transformer rated at 500 kVA gives the following values of equivalent resistance and reactance referred to the low voltage side, when a short circuit test is performed on it

Re2= 2mΩ , Xe2= 6mΩ

When the transformer is delivering rated current to a unity pf load, the induced emf will be

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Apr 9ESE & GATE EE