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Quiz von BSNL ACADEMY, aktualisiert more than 1 year ago
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Frage 1
Frage
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
Antworten
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R Ω
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2R Ω
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4R Ω
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8R Ω
Frage 2
Frage
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
Antworten
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10
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60
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600
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1200
Frage 3
Frage
Instantaneous power in inductor is proportional to the
Antworten
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product of the instantaneous current and rate of change of current.
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square of instantaneous current.
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square of the rate of change of current.
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temperature of the inductor.
Frage 4
Frage
If P is the power of a star connected system then what will be power of an equivalent delta connected system?
Antworten
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P
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3P
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P/3
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None of the above
Frage 5
Frage
Power dissipation in ideal inductor is
Antworten
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Maximum
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Minimum
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Zero
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A finite value
Frage 6
Frage
Inductor does not allow the sudden change of
Antworten
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current
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voltage
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power
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None of the above
Frage 7
Frage
Which of the following has no units?
Antworten
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Permeability
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Moment of a magnet
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Magnetic susceptibility
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Permittivity
Frage 8
Frage
Which of the following defined the average value ?
Antworten
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Voltage
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Heating effect
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Current
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Charge transfer
Frage 9
Frage
If a pure inductor is connected across the ac source, the average power taken by the inductor is
Antworten
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A few watt
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100 watt
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zero watt
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Maximum power
Frage 10
Frage
In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?
Antworten
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1 μsec
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2 msec
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2 μsec
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4 msec
Frage 11
Frage
The right hand rule for determining the direction of the induced EMF was introduced by
Antworten
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Faraday
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Lenz
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Fleming
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Maxwell
Frage 12
Frage
Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
Antworten
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first law
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second law
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third law
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fourth law
Frage 13
Frage
Which of the following represents ohms law
Antworten
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V = RI
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J = σE
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I = GV
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All of the above
Frage 14
Frage
In the left hand rule, forefinger always represents
Antworten
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voltage.
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current.
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magnetic field.
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direction of force on the conductor.
Frage 15
Frage
Cork Screw rule is used to find
Antworten
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direction of current.
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direction of magnetic field.
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direction of electric field.
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direction of emf.
Frage 16
Frage
Biot-Savarts law states the relation between magnetic intensity and
Antworten
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filament current only.
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surface current only.
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volume current only.
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(A), (B), and (C) are all correct.
Frage 17
Frage
The drawback of Daltons atomic structure is that, it says
Antworten
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the atoms can neither be created nor be destroyed.
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unique nature of atom.
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most of the volume of an atom is empty space.
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none of these.
Frage 18
Frage
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is
Antworten
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directly proportional to the square of the distance between them.
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inversely proportional to the square of the distance between them.
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inversely proportional to the distance between them.
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directly proportional to the distance between them.
Frage 19
Frage
Ohm’s law in point from field theory can be expressed as
Antworten
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J = σE.
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V = IR.
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J = E / σ.
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R = ρ × ( l / A).
Frage 20
Frage
Coulombs law for the force between electric charges most closely resembles with
Antworten
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Newtons law of motion.
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Law of conservation of energy.
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Gausss theorem.
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Newtons law of gravitation.
Frage 21
Frage
The Biot-savarts law is a general modification of
Antworten
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Kirchhoffs law.
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Lenzs law.
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Amperes law.
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Faradays law.
Frage 22
Frage
The direction of induced emf can be found by
Antworten
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Laplaces law.
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Kirchhoffs voltage law.
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Lenzs law.
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Flemings right hand rule.
Frage 23
Frage
Conductor is constant and field is varying then emf will induce. This principle is called
Antworten
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virtually induced emf.
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dynamically induced emf.
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static induced emf.
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none of the above.
Frage 24
Frage
The operation of electric generators and motors depend on the intraction between magnetic field and
Antworten
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Commutator.
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Electric current.
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Copper conductors.
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Electric fields.
Frage 25
Frage
The heating time constant of an electrical machine gives an induction of its
Antworten
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rating.
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cooling.
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overload capacity.
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short time rating.
Frage 26
Frage
Flemings left hand rule may be applied to an electric generator to find out the direction of
Antworten
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induced emf.
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rotor rotation.
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magnetic field.
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none of the above.
Frage 27
Frage
Nodal analysis can be applied for
Antworten
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planar networks.
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non planar networks.
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both planner and non planner networks.
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neither planner nor non planner networks.
Frage 28
Frage
KCL works on the principle of which of the following
Antworten
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Law of conservation of charge
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Law of conservation of energy
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Both
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None of the above
Frage 29
Frage
KVL works on the principle of
Antworten
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Law of conservation of charge
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Law of conservation of energy
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Both
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None of the above
Frage 30
Frage
Form factor is equal to Peak factor in case of
Antworten
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Square wave
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Triangle wave
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Saw tooth wave
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All of the above
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