TNPSC Group 1, 2, 4 Previous Year Question Papers with Answers - 2

Question: 6

When unit current flows through the coil, the coefficient of self induction numerically equal to

(A) magnetic flux linked with the coil

(B) rate of change of current through the coil

(C) voltage lined with the coil

(D) current linked with the coil

Question: 7

Induction motors are used in

(A) fans

(B) fridge

(C) mixies

(D) grinders

Question: 8

In low power AC dynamoes magnetic field is provided by

(A) electromagnets

(B) permanent magnets

(C) cylindrical magnets

(D) horseshoe magnets

Question: 9

Trains are

(A) electric brake

(B) electromagnetic brake

(C) air brake

(D) hydraulic brakes

Question: 10

For direct current, inductive reactance is

(A) less than unity

(B) infinity

(C) unity

(D) zero