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SSC JE EE Quiz: Electrical Machine Booster Quiz-10

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Question 1

A synchronous machine is provided with damper winding. At negative slip, the damping torque developed by damper winding acts,

Question 2

Which of the following is true with a regenerative braking?

Question 3

A SCIM having a rated slip of 4% on full load has a starting torque the same as full load torque the starting current is

Question 4

In a case when the field winding is externally excited by d.c battery, an appropriate amount of flux is created in its field winding this process in called

Question 5

What is the output power to the load when the input power to the primary of a transformer is 140 W and 4.8 W is lost to the winding resistance?

Question 6

In a rotor fed induction motor, speed of stator magnetic field with respect to rotor will be

Question 7

A cylindrical rotor alternator with negligible armature resistance operates at

1) Unity p.f. if E_f cosδ = V_t

2) Lagging p.f. if E_f cosδ < V_t

3) Lagging p.f. if E_f cosδ > V_t

4) Zero p.f. lagging if E_f > V_t

Which of these statements is/are correct?

Question 8

When 12 percent of the total flux generated in the primary does not pass through the secondary in a particular transformer, what is the coefficient of coupling for the transformer?

Question 9

The torque which is defined as the maximum torque at any angular rotor position and rated voltage at any frequency applied which is provided by stator winding is defined as

Question 10

The direction of current in compensating winding is ______ to armature winding current, which is responsible for having _______ effect on armature reaction in D.C. machine.

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