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SSC JE EE Quiz: Electrical Machine Booster Quiz-15

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Question 1

Distribution transformers have core loss

Question 2

An electric motor with constant output power will have Torque Speed characteristics in the form of

Question 3

In 3-phase synchronous generator resultant flux density is how many time maximum flux density

Question 4

For differential protection of power transformer (delta-delta) the current transformers will have

Question 5

For an induction motor, at normal operating voltage, slip is 0.02. At what slip, same torque will be developed provided the voltage is 20% below the normal voltage.

Question 6

The power input to the 3-phase, 4 pole 50 Hz induction motor is 80 kW. If rotor is rotating at 1425 rpm then, rotor cupper loss is

Question 7

For a shunt motor, consider the following,

(i) Developed torque = 20 N-m

(ii) Armature current = 40 A

Now this motor is converted to cummulative compound motor by adding series field winding. Now its

(i) Armature current = 60 A

(ii) flux = 1.2 times initial flux

Developed torque for cummulative compound motor is ______N-m.

Question 8

A synchronous generator connected to an infinite bus is overexcited. From the point of view of the system (considering only the reactive power), the machine acts as

Question 9

What is determined by the Blocked rotor test of squirrel cage induction motor ?

Question 10

Which among the following type of transformer have smallest size with same electrical specification?

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Oct 29AE & JE Exams