Electric Circuits Objective Questions
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Third pin of a 3 pin plug is thicker and longer due to
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If the practical units of voltage and current wave each made 20 times as large as they are at present, what would be the consequent alternation in the size of the unit of capacitance?
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For balanced star load, if unbalanced line current are I_{R}, I_{Y}, I_{B} equal to  j10,  j10 and  j20 respectively, the neutral current will be equal to
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A 100 ohm resistor is directly connected across a 80 V battery. What is the power dissipation?
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Efficiency of electrical machines should be calculated by measuring
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A balanced three Phase Yconnected load has one phase voltage V_{B} = 277∠45° V. The phase sequence is RYB. The line to line voltage V_{RY} is
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Three identical inductors are connected in delta with a 220 V, 50 Hz, 3  &Phi, supply. If the phase current is 24 A, then what is the value of each of the inductance?
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What are the points to be mentioned in specifying main switches?
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In direct arc furnace which of following is of high value?
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Find the total power absorbed by the resistor in the given circuit.
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A 60 Hz frequency voltage would case a bulb to turn on and off
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power given in the 5 V source is
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The speed of a DC motor is
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Consider the following circuit. What is the value of i ?
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Air gap flux density is of the order of
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Types of rotating machines
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Total power consumed in the circuit below is 10 W. Find x.
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A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF.
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V_{RN}, V_{YN} and V_{BN} are three phase voltage of a balanced three phase system. If V_{RN} = 200∠30° V and V_{BN} = 200∠ 90° V, then phase sequence of the system is
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If V_{out} = 1 V for 1 kHz input then what would be V_{out} for 10 kHz for same input ?
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Power factor can be defined as
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In delta connected circuit when one resistor is open, then power will be
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In a 3  phase delta connection, two wattmeter method is used to measure the power; if readings of two wattmeters are 28.13 kW and 13.31 kW, if circuit efficiency is 90 %. What will be output power ?
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The number of electrons in the outer most orbits of carbon atom is
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In which braking back emf exceeds supply voltage?
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Phase voltages of a star connected alternator are E_{R} = 240∠0° V, E_{Y} = 240∠ 120° V and E_{B} = 240∠ + 120° V. What is the phase sequence of the system?
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Our household apparatus are connected in
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A 3 wire, 3  φ supply feeds a load consisting of three equal resistors. By how much is the load reduced if one of the resistors be removed when the load is the star ?
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For a 3  phase load balanced condition, each phase has the same value of __________________
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The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be
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