Electric Circuits Objective Questions
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A parallel plate capacitor with air as dielectric, force between plate is F. If capacitor is now immersed water of dielectric Îµr, force between plate will be â€“
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If c_{1} = 8 Î¼F, c_{2} = 4 Î¼F, c_{3} = 7 Î¼F c_{1}, c_{2} are in series with c_{3}; effective capacitance will be
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An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?
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A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is
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For electrics flux is proportional to
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Two point charges of 4Î¼C are placed at a distance of 3 cm apart from each other in free space. Force acting on two charges will be
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Which field is associated with the capacitor?
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A conductor of length l meters moves at right angles to a uniform magnetic field of flux density B = 1.5 T. if the velocity of revolution of the conductor is 50 ms1 then induced e.m.f. in the conductor is
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A capacitor having a mica dielectric Îµ_{R} = 6, a plate area of a 10 inches2 and a separation 0.01 inch. Find the value of C
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In an AC circuit, containing pure inductance, the voltage applied is 120 V, 50 Hz while the current is 10 A. Find the value of inductance.
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When a dielectric is placed in an electric field the field strength
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An equipotential surface is one which has all points at _____________ potential.
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A parallel plate capacitor contain there dielectric layers of 1, 2 and 3 respectively and thickness of dielectric layers are 0.2 mm, 0.3 mm and 0.4 mm respectively. If area of plate is 20 cm2. What is the value of capacitance?
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The unit of electric field intensity is
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A 2 m long conductor, carries a current of 50 A at a magnetic field of 100 Ã— 10 âˆ’ 3 T. The force on the conductor is
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Under resonance condition the power factor of a system is
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The presence of an uncharged conductor near a charged one increases the
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Which of following is the unit of magnetic flux density?
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Emf induced in a coil rotating in a uniform magnetic field will be maximum when the
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The coils having self inductor of 10 mH and 15 mH have an effective inductor of 40 mH , when connected in series aiding. What will be the equivalent inductor if we connect them in series opposing
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The time required for a pulse to change from 10 % to 90 % of its maximum value is known as
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Reactive power drawn by a pure resistor is
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The ratio of intensity of magnetisation to the magnetising force is known as
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Fall time is the time required for a pulse to decrease from 90 to ________% if its maximum values
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A rectangular magnet of magnetic moment M is cut into two places of same length. The magnetic moment of each place will be
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The stray line of magnetic flux is defined as
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Which part of magnetic path requires largest mmf?
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The electric field at a point situated at a distance d from straight charged conductor is
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An electric field can deflect
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A positive and a negative charged are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be
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