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Short circuit in a system causes which type of faults (1) Series (2) Shunt (3) Symmetrical (4) All of the above

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During 3-phase short circuit on a unloaded alternator, the dc component may be zero in (1) One phase only (2) Any two phases (3) All three phases (4) None of the above 

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1 answer 38 views

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A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at  (A) 50.0% of the rated current (B) 64.0% of the rated current (C) 80.0% of the rated current (D) 88.8% of the rated current

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1 answer 28 views

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 18 views

The magnitude of the open-circuit and short circuit input impedance of a transmission line are 100 ohm and 25 ohm respectively. The characteristic impedance of line is:  (1) 25 ohm (2) 50 ohm (3) 75 ohm (4) 100 ohm

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0 answers 29 views

With the help of a schematic diagram explain how a overcurrent relay protects a line during short circuit fault. 

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
1 answer 19 views

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For internal faults in generator, the primary protection is provided by (1) Earth fault relay (2) Differential relay (3) Induction type inverse definite minimum time relay (4) Definite minimum time relay 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
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Which of the following circuit breaker is generally used in railway electrification ?   (a) Air Blast circuit breaker (b) Minimum Oil circuit breaker (c) Bulk Oil circuit breaker (d) SF6 circuit breaker  

asked Apr 10, 2018 in Electrical Engineering by Shimroz123

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