BSNL TTA ONLINE TEST - 1 Basic Electricity -1

BSNL ACADEMY
Quiz by BSNL ACADEMY, updated more than 1 year ago
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Subject : Basic Electricity Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
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Question 1

Question
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
Answer
  • R Ω
  • 2R Ω
  • 4R Ω
  • 8R Ω

Question 2

Question
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
Answer
  • 10
  • 60
  • 600
  • 1200

Question 3

Question
Instantaneous power in inductor is proportional to the
Answer
  • product of the instantaneous current and rate of change of current.
  • square of instantaneous current.
  • square of the rate of change of current.
  • temperature of the inductor.

Question 4

Question
If P is the power of a star connected system then what will be power of an equivalent delta connected system?
Answer
  • P
  • 3P
  • P/3
  • None of the above

Question 5

Question
Power dissipation in ideal inductor is
Answer
  • Maximum
  • Minimum
  • Zero
  • A finite value

Question 6

Question
Inductor does not allow the sudden change of
Answer
  • current
  • voltage
  • power
  • None of the above

Question 7

Question
Which of the following has no units?
Answer
  • Permeability
  • Moment of a magnet
  • Magnetic susceptibility
  • Permittivity

Question 8

Question
Which of the following defined the average value ?
Answer
  • Voltage
  • Heating effect
  • Current
  • Charge transfer

Question 9

Question
If a pure inductor is connected across the ac source, the average power taken by the inductor is
Answer
  • A few watt
  • 100 watt
  • zero watt
  • Maximum power

Question 10

Question
In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?
Answer
  • 1 μsec
  • 2 msec
  • 2 μsec
  • 4 msec

Question 11

Question
The right hand rule for determining the direction of the induced EMF was introduced by
Answer
  • Faraday
  • Lenz
  • Fleming
  • Maxwell

Question 12

Question
Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
Answer
  • first law
  • second law
  • third law
  • fourth law

Question 13

Question
Which of the following represents ohms law
Answer
  • V = RI
  • J = σE
  • I = GV
  • All of the above

Question 14

Question
In the left hand rule, forefinger always represents
Answer
  • voltage.
  • current.
  • magnetic field.
  • direction of force on the conductor.

Question 15

Question
Cork Screw rule is used to find
Answer
  • direction of current.
  • direction of magnetic field.
  • direction of electric field.
  • direction of emf.

Question 16

Question
Biot-Savarts law states the relation between magnetic intensity and
Answer
  • filament current only.
  • surface current only.
  • volume current only.
  • (A), (B), and (C) are all correct.

Question 17

Question
The drawback of Daltons atomic structure is that, it says
Answer
  • the atoms can neither be created nor be destroyed.
  • unique nature of atom.
  • most of the volume of an atom is empty space.
  • none of these.

Question 18

Question
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is
Answer
  • directly proportional to the square of the distance between them.
  • inversely proportional to the square of the distance between them.
  • inversely proportional to the distance between them.
  • directly proportional to the distance between them.

Question 19

Question
Ohm’s law in point from field theory can be expressed as
Answer
  • J = σE.
  • V = IR.
  • J = E / σ.
  • R = ρ × ( l / A).

Question 20

Question
Coulombs law for the force between electric charges most closely resembles with
Answer
  • Newtons law of motion.
  • Law of conservation of energy.
  • Gausss theorem.
  • Newtons law of gravitation.

Question 21

Question
The Biot-savarts law is a general modification of
Answer
  • Kirchhoffs law.
  • Lenzs law.
  • Amperes law.
  • Faradays law.

Question 22

Question
The direction of induced emf can be found by
Answer
  • Laplaces law.
  • Kirchhoffs voltage law.
  • Lenzs law.
  • Flemings right hand rule.

Question 23

Question
Conductor is constant and field is varying then emf will induce. This principle is called
Answer
  • virtually induced emf.
  • dynamically induced emf.
  • static induced emf.
  • none of the above.

Question 24

Question
The operation of electric generators and motors depend on the intraction between magnetic field and
Answer
  • Commutator.
  • Electric current.
  • Copper conductors.
  • Electric fields.

Question 25

Question
The heating time constant of an electrical machine gives an induction of its
Answer
  • rating.
  • cooling.
  • overload capacity.
  • short time rating.

Question 26

Question
Flemings left hand rule may be applied to an electric generator to find out the direction of
Answer
  • induced emf.
  • rotor rotation.
  • magnetic field.
  • none of the above.

Question 27

Question
Nodal analysis can be applied for
Answer
  • planar networks.
  • non planar networks.
  • both planner and non planner networks.
  • neither planner nor non planner networks.

Question 28

Question
KCL works on the principle of which of the following
Answer
  • Law of conservation of charge
  • Law of conservation of energy
  • Both
  • None of the above

Question 29

Question
KVL works on the principle of
Answer
  • Law of conservation of charge
  • Law of conservation of energy
  • Both
  • None of the above

Question 30

Question
Form factor is equal to Peak factor in case of
Answer
  • Square wave
  • Triangle wave
  • Saw tooth wave
  • All of the above
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