7/27/2019 Electrical Important Mcqs

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Joined:

22 Jul2006Posts: 34

05 Nov 2008 4:24 bout electronics related mcq's.....

1) What is the distance between the EHV lines?a)8m b)11m c)4m d)14m

2) At present how many HVDC lines are there in india?

a)none b)one c)two d)more than two

3) What is the approximate peak overshoot for a unity feedback system with damping factor 0.6?

a)10% b)5% c)15% d)20%

4) What is the distance between the EHV lines and earth?a)8m b)11m c)18m d)15m

5) What happens to the value of inductance when self GMD is doubled?

6) At what frequency corona loss is more?a) 50Hzb) 60Hz

7) Burden of current transformers is measured in..a) Wattsb) Volt Amperesc) Ampere Hoursd) Joules

Large no of thyristors are used in HVDC transmission to improve______

a) current ratingb) voltage ratingc) Thyristers are available at high ratings

9) _________is connected to reduce frequency errors in ammeter.a) shunt capacitorb) series inductancec) shunt inductance

10)The principle used in megger?a) electrostatic effectb) magnetic effectc) Induction effect

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umang

Joined:22 Jul2006

Posts: 34

05 Nov 2008 13:34 Re: bout electronics related mcq's.....tags: in distribution lines_____electrodynamometer pressure coilin ehv lines x/r=10

> damping is proportional to gain, sqrtof gain, 1/gain or 1/sqrt of gain

> In electrodynamometer type wattmeter the error is due to..

a) pressure coil inductanceb) pressure coil resistance

> In distribution lines_____a) X/R10c) X/R>1d) X/R In EHV lines _____a) X/R=10b) X/R=100> Insulators in EHV lines are designed based on_____a) switching voltages

b) peak voltagesc) coronad) lightning voltages

> The value of restriking voltage depends on______a) inductance of lineb) capacitance of linec) bothd) none

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