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Power Systems QUESTIONS AND ANSWERS

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 2024 and IES 2024 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

increases

remains unchanged

decreases

uncertain

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