MCQ's on Basic 3 Electrical

MCQ's on Basic Electrical

Question 21

If P is the power of a star-connected system then the power in the equivalent delta system is

  (a) P/3

  (b) P 

  (c) 3P

  (d) None of the above

The correct answer is (c) 3P

Question 22

Inductor does not allow sudden change of 

  (a) Voltage

  (b) Current

  (c) Power

  (d) Resistance

The correct answer is (b) Current

Question 23

Capacitor does not allow sudden change of 

  (a) Voltage

  (b) Current

  (c) Power

  (d) Resistance

The correct answer is (a) Voltage

Question 24

For domestic purposes, how are circuits connected?

  (a) Straight

  (b) Parallel

  (c) Serial

  (d) Series

The correct answer is (b) Parallel

Question 25

The instrument which is used to detect electric current is known as?

  (a) Voltmeter

  (b) Rheostat

  (c) Wattmeter

  (d) Galvanometer

The correct answer is (d) Galvanometer

Question 26

The objective of earthing or grounding is

  (a) To provide as low resistance possible to the ground

  (b) To provide as high resistance possible to the ground

  (c) To provide flow of positive, negative and zero sequence current

  (d) None of these

The correct answer is (a) To provide as low resistance possible to the ground

Question 27

A closed switch has a resistance of?

  (a) Zero

  (b) 10 ohms

  (c) 25 ohms

  (d) Infinity

The correct answer is (a) Zero

Question 28

Eddy current loss will depends on

  (a) Frequency

  (b) Flux density

  (c) Thickness

  (d) All of the above

The correct answer is (d) All of the above

Question 29

Nichrome wire is an alloy of 

  (a) Lead and Zinc

  (b) Chromium and Vanadium

  (c) Nickel and chromium 

  (d) Copper and silver

The correct answer is (c) Nickel and Chromium

Question 30

One Joule per Coulomb is called?

  (a) Volt

  (b) Ampere

  (c) Gauss

  (d) Farad

The correct answer is (a) Volt