5975403
Descripción
Test por BSNL ACADEMY, actualizado hace más de 1 año
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Creado por BSNL ACADEMY
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Pregunta 1
Pregunta
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
Respuesta
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R Ω
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2R Ω
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4R Ω
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8R Ω
Pregunta 2
Pregunta
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
Respuesta
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10
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60
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600
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1200
Pregunta 3
Pregunta
Instantaneous power in inductor is proportional to the
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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.
Pregunta 4
Pregunta
If P is the power of a star connected system then what will be power of an equivalent delta connected system?
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P
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3P
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P/3
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None of the above
Pregunta 5
Pregunta
Power dissipation in ideal inductor is
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Maximum
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Minimum
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Zero
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A finite value
Pregunta 6
Pregunta
Inductor does not allow the sudden change of
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current
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voltage
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power
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None of the above
Pregunta 7
Pregunta
Which of the following has no units?
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Permeability
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Moment of a magnet
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Magnetic susceptibility
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Permittivity
Pregunta 8
Pregunta
Which of the following defined the average value ?
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Voltage
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Heating effect
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Current
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Charge transfer
Pregunta 9
Pregunta
If a pure inductor is connected across the ac source, the average power taken by the inductor is
Respuesta
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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
Pregunta 10
Pregunta
In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?
Respuesta
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1 μsec
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2 msec
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2 μsec
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4 msec
Pregunta 11
Pregunta
The right hand rule for determining the direction of the induced EMF was introduced by
Respuesta
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Faraday
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Lenz
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Fleming
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Maxwell
Pregunta 12
Pregunta
Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
Respuesta
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first law
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second law
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third law
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fourth law
Pregunta 13
Pregunta
Which of the following represents ohms law
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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
Pregunta 14
Pregunta
In the left hand rule, forefinger always represents
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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.
Pregunta 15
Pregunta
Cork Screw rule is used to find
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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.
Pregunta 16
Pregunta
Biot-Savarts law states the relation between magnetic intensity and
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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.
Pregunta 17
Pregunta
The drawback of Daltons atomic structure is that, it says
Respuesta
-
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.
Pregunta 18
Pregunta
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is
Respuesta
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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.
Pregunta 19
Pregunta
Ohm’s law in point from field theory can be expressed as
Respuesta
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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).
Pregunta 20
Pregunta
Coulombs law for the force between electric charges most closely resembles with
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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.
Pregunta 21
Pregunta
The Biot-savarts law is a general modification of
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Kirchhoffs law.
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Lenzs law.
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Amperes law.
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Faradays law.
Pregunta 22
Pregunta
The direction of induced emf can be found by
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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.
Pregunta 23
Pregunta
Conductor is constant and field is varying then emf will induce. This principle is called
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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.
Pregunta 24
Pregunta
The operation of electric generators and motors depend on the intraction between magnetic field and
Respuesta
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Commutator.
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Electric current.
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Copper conductors.
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Electric fields.
Pregunta 25
Pregunta
The heating time constant of an electrical machine gives an induction of its
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rating.
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cooling.
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overload capacity.
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short time rating.
Pregunta 26
Pregunta
Flemings left hand rule may be applied to an electric generator to find out the direction of
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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.
Pregunta 27
Pregunta
Nodal analysis can be applied for
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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.
Pregunta 28
Pregunta
KCL works on the principle of which of the following
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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
Pregunta 29
Pregunta
KVL works on the principle of
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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
Pregunta 30
Pregunta
Form factor is equal to Peak factor in case of
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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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