Electrical Engineering Questions And Answers :: Power Systems: part3

Electrical Engineering : Power Systems QUESTIONS AND ANSWERS :: part3 : 16 to 20

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

16.The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be

230 V
460 V
115 V
65 V

17.If an induction machine is run at above synchromous speed, it acts as

a synchronous motor
an indcution generator
an inductor motor
none of the above

18.For certain geometry and operating voltage of the uncompensated transmission line, the ratio of power transfer capability to the surge inpedance loading with increase in length

remains unchanged

19.For any fixed degree of inductive shunt compensation, additional series capacitive compensation

increase the effective length of line
increase virtual surge impedance line
decrease virtual surge impedance loading of the line
none of the above

20.For reducing tower footing resistance it is better to Use

chemical and ground rods only
chemical and counterpoise only
ground rod and counterpoise only
chemical, ground rods and counterpoise

More Power Systems QUESTIONS AND ANSWERS available in next pages

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