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JE 2019 || Day 24 || Synchronous Machines Quiz 3

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Question 1

Leading power factor synchronous motors cost ……………. the unity p.f. motors.

Question 2

A 18.65 kW, 220 V, 50 Hz, 4-pole, y-connected synchronous motor is running with a light load. The load angle is

(elect.) and back e.m.f. generated per phase in 110 V. If the armature resistance per phase is

and synchronous reactance/ phase is

armature current/phase is ………………

Question 3

A 18.65 kW, 220 V, 50 Hz, 4-pole, y-connected synchronous motor is running with a light load. The load angle is

(elect.) and back e.m.f. generated per phase in 110 V. If the armature resistance per phase is

and synchronous reactance/ phase is

the p.f. of the motor is …………..

Question 4

A 3-phase induction motor draws 1000 kVA at a p.f. of 0.8 lag. A synchronous motor is connected in parallel to draw an additional 750 kVA at a power factor of 0.6 lead. The p.f. of the total load supplied by the main is

Question 5

An induction motor and a synchronous motor are connected to a common feeder line. To operate the feeder line at unity p.f., the synchronous motor should be

Question 6

The full-load slip of a synchronous motor is ……………..

Question 7

A synchronous motor runs at only one speed (i.e. synchronous speed) because it ………………

Question 8

In a synchronous motor _____________.

Question 9

In an alternator, the armature reaction is purely cross-magnetising at a power factor of

Question 10

For a given load, the armature current of a synchronous motor will be minimum for ………….. power factor.

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ESE & GATE EE General

Apr 24ESE & GATE EE