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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 EEGeneralApr 24ESE & GATE EE