BSNL TTA (JE) BASIC ELECTRICITY 200 EXPECTED QUESTIONS PART ONE

NOTE-1.Total No of questions 100
2.ANSWER KEY-Correct answer is indicated by symbol (V) in options.
3.HINTS-In some questions options E-HINTS is indicating the hints of answe
r.

1) Resistivity of a wire depends on
A [ ]) length

B [v]) material

C [ ]) cross section area

D [ ]) none of the above

2) If 1 A current flows in a circuit, the number of electrons flowing through this circuit is
A [ ]) 1.6 × 1019

B [v]) 0.625 × 1019
C [ ]) 1.6 × 10 – 19

D [ ]) 0.625 × 10 – 19

3) The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

A [ ]) R Ω

B [ ]) 2R Ω

C [ ]) 4R Ω

D [v]) 8R Ω

4) How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
A [ ]) 10

B [ ]) 60

C [v]) 600

D [ ]) 1200

5) The unit of resistivity is

A [ ]) Ω.

B [v]) Ω – metre.

C [ ]) Ω / metre.
D [ ]) Ω / m².

6) Instantaneous power in inductor is proportional to the

A [v]) product of the instantaneous current and rate of change of current. 
B [ ]) square of instantaneous current.

C [ ]) square of the rate of change of current.

D [ ]) temperature of the inductor.

7) The voltage induced in an inductor is represented as,

A [ ]) product of its inductance and current through it.
 B [ ]) ratio of its inductance to current through it.

C [ ]) ratio of current through it to its inductance.

D [v]) product of its inductance and rate of change of current through it.
8) Magnetic flux has the unit of

A [ ]) Newton

B [ ]) Ampere turn

C [v]) Weber

D [ ]) Tesla

9) If P is the power of a star connected system then what will be power of an equivalent delta connected system?

A [v]) P

B [ ]) 3P

C [ ]) P/3

D [ ]) None of the above

10) Which of the followings is/are active element?
A [ ]) Voltage source

B [ ]) Current source

C [v]) Both

D [ ]) None of these.
11) Which of the following are the passive elements?

A [ ]) Resistor

B [ ]) Bulb

C [v]) Both

D [ ]) None of these.

12) Power dissipation in ideal inductor is

A [ ]) Maximum

B [v]) Zero

C [ ]) Minimum

D [ ]) A finite value

13) Inductor does not allow the sudden change of

A [v]) current
B [ ]) voltage

C [ ]) power

D [ ]) None of the above

14) Capacitor does not allow the sudden change of
A [ ]) current

B [v]) voltage

C [ ]) power

D [ ]) None of the above

15) Internal resistance of ideal voltage source is

A [v]) zero
B [ ]) infinite

C [ ]) finite

D [ ]) 100 ohms

16) Internal resistance of ideal current source is
 
A [ ]) zero

B [v]) infinite

C [ ]) finite

D [ ]) 100 ohms

17) Which quantity consists of a unit KWh ?
A [v]) Energy

B [ ]) Time

C [ ]) Power

D [ ]) Charge

18) Which of the following has no units?

A [ ]) Permeability

B [ ]) Moment of a magnet
C [v]) Magnetic susceptibility

D [ ]) Permittivity

19) Which of the following quantities consists of SI unit as WATT ?

A [ ]) Force

B [ ]) Charge

C [ ]) Current

D [v]) Power

20) Rms value is defined based on which of the following?

A [v]) Heating effect

B [ ]) Charge transfer

C [ ]) Current

D [ ]) Voltage

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