Model Question (1) on KSEB SUB Engineer (Kerala PSC)

1.The breadth factor of a 3 phase ac winding is about :

(a) 0.96 (b) 0.7

(c) 0.5 (d) 0.85

2.In a non – salient pole synchronous machine the distribution of mmf

around the air gap is?

(a) Rectangular Wave (b) Sinusoidal Wave

3.The principle of working of a transformer is?

Mutual Induction

4.Iron loss of transformer is measured by?

Low PF wattmeter

5.The secondary distribution transformer must be?

Delta

6.The secondary of a current transformer is never?

Never left open circuited

7.A transformer will have zero regulation at--------------- power factor?

Leading

8.A humming sound is produced in a distribution transformer due to the?

Vibration of the core

9. The rating of transformer is expressed in?

KVA

10.The core of transformer is made of?

Silicon Steel

Q world