Time Left - 06:00 mins

SSC JE 2017: Electrical Machines Rankers Quiz 4

Attempt now to get your rank among 1258 students!

Question 1

Two d.c. series motors connected in series draw current I from supply and run at speed N. When the same two motors are connected in parallel taking current I from the supply, the speed of each motor will be:

Question 2

If the supply polarity to the armature terminals of a separately excited d.c. motor is reversed, the motor will run under

Question 3

A 3-phase alternator generates an open circuit phase voltage of 4000 V when exciting current is 50 A; the short-circuit current for the same excitation being 800 A. The synchronous reactance per phase is ……………… .

Question 4

Two single-phase ac motors A and B operate from a 1000 V supply. A consumes 2 kW at a power factor of 0.8 (lagging) and B consumes 1 kW at a power factor of 0.5 (lagging). The total current drawn from the supply is approximately

Question 5

If the centrifugal switch of a single-phase resistance split induction motor does not open after starting of motor, the motor

Question 6

Which of the following condition is NOT mandatory for alternators working in parallel?

Question 7

Low frequency operation of a.c. series motor in traction application:

Question 8

What is the efficiency of transformer compared with that of electrical motors of the same power?

Question 9

If K is the phase – to – phase voltage ratio, then the line-to-line voltage ratio in a 3-phase Y - Δ transformer is

Question 10

In an autotransformer of voltage ratio

V₁ > V2, the fraction of power transferred inductively is proportional to

1258 attempts
2 upvotes
23 comments

Tags :

ESE & GATE EE Electrical Machines

Jun 15ESE & GATE EE