Basic electrical MCQ #4

1) Number of parallel paths in wave winding is:

     (a) 4

     (b) 3

     (c) 2

     (d) 6

2) Which of the following is a secondary cell?

     (a) Lead acid cell

     (b) Voltaic cell

     (c) Leclanche cell

     (d) Dry cell

3) Unit of reluctance:

     (a) Weber Turns/Ampere

     (b) Henry

     (c) Weber Turns

     (d) Ampere Turns/Weber

4) A DC generator works on the principle of

     (a) Faraday’s laws of electrolysis

     (b) Faraday’s laws of electromagnetism induction

     (c) Fleming’s left-hand rule

     (d) Mutual induction

5) The back e.m.f. of a DC motor depends on:

     (a) Field flux

     (b) Shape of conductors

     (c) Types of commutator

     (d) Brush material

ANSWER: | 1-c | 2-a | 3-d | 4-b | 5-a|

6) Which of the following machine will be preferred to charge the batteries?

    a) Compound generator

    b) Series motor

    c) Shunt generator

    d) Series generator

7) An induction motor with 1000 rpm speed will have

    a) 8 poles

    b) 6 poles

    c) 4 poles

    d) 2 poles

8) Insulation resistance is measured in

     (a) Nano ohms

     (b) Mega watts

     (c) Mega ohms

     (d) Kilo volts

9) What type of motor is used in a food mixer?

     (a) Permanent capacitor

     (b) DC shunt motor

     (c) Capacitor start motor

     (d) Universal motor

10) Buchholz relay is a device related with:

     (a) Transformer

     (b) Synchronous motor

     (c) Autotransformer

     (d) Alternator

ANSWER: | 6-c | 7-b | 8-c | 9-d | 10-a|

11) MCCB stands for:

     (a) Main Current Circuit Breaker

     (b) Metal Close Circuit Breaker

     (c) Molded Case Circuit Breaker

     (d) Miniature Current Circuit Breaker

12) The brushes of electrical machines are made of

    (a) Carbon

    (b) Steel

    (c) Cast iron

    (d) Copper

13) Electrical work is

    (a) Directly proportional to the potential difference

    (b) Directly proportional to the current

    (c) Directly proportional to the charge

    (d) All of these

14) An electric current is the

     (a) flow of electrons.

     (b) opposition to electrons.

     (c) storage of charge.

     (d) ionization of atom.

15) The number of a cycle per second is called

     (a) frequency.

     (b) time period.

     (c) angular displacement.

     (d) angular velocity.

ANSWER: | 11-c | 12-a | 13-d | 14-a | 15-a|