ELECTRICAL OBJECTIVE QUESTIONS | DAILY UPDATES-2

ELECTRICAL OBJECTIVE QUESTIONS DAY-2

Daily  questions from all electrical topics..topic wise question and answers

check your knowledge by these questions….

DC BASICS AND NETWORKS

1.The flow of electrical current in a conductor is due to flow of  ?

a) electrons.         b) protons.

c) electrons and ions.         d) charged particles.

ANS: (a)

2) An electric current is the ?

a) random movement of electrons in a conductor

b) movement of free electrons predominately in one direction

c) pressure difference between two poles

d) the power that causes drift of electrons.

ANS: (b)

AC BASICS AND NETWORKS

3)The direction of current in an ac circuit ?

a) is from positive to negative.

b) is always in one direction.

c) varies from instant to instant.

d) cannot be determined.

ANS: (c)

4) When an electric current is passed through a bucket full of water, lot of bubbling in there–the electric current is ?

a) ac.                             b) dc.

c) pulsating.              d) none

ANS: (b)

DC MACHINES

5) Which device illustrates the principle of electro-mechanical conversion ? (asked in B.T.E M.P 1996)

a) Amplifier.                                               b)Battery charger.

c) Transformer.                                         d) Electric bell.

ANS: (a)

6) Fleming’s left hand rule is applicable to ? (asked in B.T.E M.P 1992)

a) dc generator                b) dc motor

c) alternator                     d) Transformer

ANS: (b)

AC MACHINES

7) In a transformer electrical power is transferred from one circuit to another with out change in ?

a) voltage                         b) current

c) frequency                    d)  turns

ANS: (C)

8) The frequency of a voltage at the secondary is ? (A.M.I.E summer 1994)

a) greater than that of primary          b) equal to that of primary

c) less than that of primary                d) none

ANS: (b)

ELECTRONICS

9) An example of solid state device is  ?

a) zener diode    b) triode     c) pentode

d) thyratron

ANS: (a)

10) Ratings on a capacitor are given 25μF , 12V. Also a plus sign is written near one of its terminals. The capacitor is  ?

a) mica capacitor                 b) ceramic capacitor

c)electrolytic capacitor    d) paper capacitor

ANS: (C)

POWER GENERATION

11) Which of the following power plants is the least reliable ?

a) wind                          b) tidal

c) geothermal            d) solor

ANS: (a)

12) Which of the following power plants is the most reliable ?

a) diesel                 b) Hydro-electric

c) steam                d) tidal

ANS: (b)

POWER SYSTEMS

13) Which of the following is usually not the generating voltage ?

a) 6.6 KV

b) 11 KV

c) 12.5 KV

d) 13.2 KV

ANS: (c)

14) The highest transmission voltage in india is ?

a) 750 KV                   b) 400 KV

c) 220 KV                   d) 132 KV

ANS: (b)

UTILIZATION OF ELECTRICAL ENERGY AND TRACTION

15 ) DC motors are still preferred for use in ?

a) electric excavators  steel mills and cranes

b) lathes and machine tools

c) flour mills and jaw crushers

d) paper industry

ANS: (a)

16) The  conversion of AC into DC can be affected by the use of ?

a) motor-generator set

b) mercury arc rectifier

c) silicon diodes

d) any of the above.

ANS: (d)

ELECTRICAL MEASUREMENTS

17) Zener diodes , when used as voltage standards ?

a) are forward biased           b) are reverse biased

c) cover a wide range of current                          d) operate in breakdown strength

e) all of above except (a)

ANS : (e)

18 ) The material to be used in the manufacture of a standard resistor should be of ?

a) low resistivity

b) high resistivity and low temparature co-efficient

c) high temp co-efficient

d) low resistivity and high temparature co-efficient

ANS: (b)

CONTROL SYSTEMS

19) Basic elements of a closed loop control system are the ?

a) feedback and controlled system

b) controller and controlled system

c) controlled system and servo system

d) feed back element and controlled system and controller

ANS:(d)

20) A closed loop control system is basically different from open loop control system due to ?

a) feedback

b) servomechanism

c) actuating signal

d) error signal

ANS:(a)

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