Electric Circuits Objective Questions
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Efficiency of electrical machines should be calculated by measuring
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Our household apparatus are connected in
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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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In direct arc furnace which of following is of high value?
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The speed of a DC motor is
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Types of rotating machines
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Power factor can be defined as
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In which braking back emf exceeds supply voltage?
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power given in the 5 V source is
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The number of electrons in the outer most orbits of carbon atom is
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A 3 wire, 3  Ï† 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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Consider the following circuit. What is the value of i ?
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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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Find the total power absorbed by the resistor in the given circuit.
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V_{RN}, V_{YN} and V_{BN} are three phase voltage of a balanced three phase system. If V_{RN} = 200âˆ 30Â° V and V_{BN} = 200âˆ  90Â° V, then phase sequence of the system is
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In delta connected circuit when one resistor is open, then power will be
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Third pin of a 3 pin plug is thicker and longer due 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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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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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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Phase voltages of a star connected alternator are E_{R} = 240âˆ 0Â° V, E_{Y} = 240âˆ 120Â° V and E_{B} = 240âˆ + 120Â° V. What is the phase sequence of the system?
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A balanced three Phase Yconnected load has one phase voltage V_{B} = 277âˆ 45Â° V. The phase sequence is RYB. The line to line voltage V_{RY} is
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Air gap flux density is of the order 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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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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A 60 Hz frequency voltage would case a bulb to turn on and off
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What are the points to be mentioned in specifying main switches?
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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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Total power consumed in the circuit below is 10 W. Find x.
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