Time Left - 12:00 mins

JE 2019 || Day 22 || Synchronous Machines Quiz 1

Attempt now to get your rank among 820 students!

Question 1

If a 3 phase alternator is short circuited at its terminal, then the initial value of short circuit current will be limited by ________.

Question 2

Alternators are classified into _________.

Question 3

The synchronous motor runs on ____

Question 4

Hydrogen is used in large alternators mainly to

Question 5

Alternators are usually designed to generate which type of a.c. voltage?

Question 6

A-4 pole, 75 kW,

Y-connected, 50 Hz, 440 V synchronous motor operates at rated condition with 0.8 p.f. leading. The motor efficiency excluding field and stator losses is 95% and

, what is the power angle?

Question 7

A 208 V, 45 kVA, 0.8 p.f. leading,

connected, 60 Hz synchronous motor has a synchronous reactance of

and negligible armature resistance. Its friction and windage losses are 1.5 kW and its core losses are 1 kW. Initially, the shaft is supplying a 15 h.p. load and the motors p.f. is 0.8 leading. The magnitude and phase angle of armature current is

Question 8

_____is an unexcited single phase synchronous motor.

Question 9

For V-curves for a synchronous motor the graph is drawn between:

Question 10

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

820 attempts
2 upvotes
11 comments

Tags :

ESE & GATE EE General

Apr 22ESE & GATE EE