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101.

In D.C. circuits, power is measured using ________(a) ohmmeter and galvanometer(b) ohmmeter and voltmeter(c) ammeter and voltmeter(d) ammeter and galvanometerI have been asked this question during a job interview.Query is from Dynamometer Type Wattmeter in chapter Measurement of Power and Related Parameters of Electrical Measurements

Answer»

The correct answer is (c) ammeter and voltmeter

Best EXPLANATION: An ammeter is used to MEASURE current FLOWING through a circuit, while a voltmeter is used to measure the voltage across the circuit. Hence in D.C. circuits, ammeter and voltmeter are used to measure POWER.
Discussion
102.

In A.C. circuits, power consumed is ________(a) product of voltage and current(b) it depends on the p.f. of the circuit in addition to voltage and current(c) it depends on the supply voltage(d) it depends on the magnitude of the circuit currentThe question was asked during a job interview.This interesting question is from Dynamometer Type Wattmeter in portion Measurement of Power and Related Parameters of Electrical Measurements

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Correct OPTION is (b) it depends on the p.f. of the circuit in addition to VOLTAGE and current

For explanation: In a A.C. circuit, the power consumption is GIVEN by the expression,

P = VI cos∅

where, V is the voltage ACROSS the circuit

I is the current flowing through the circuit

cos∅ is the power factor of the circuit.
Discussion
103.

Power is ___________(a) rate of doing work(b) rate of producing voltage(c) rate of generating current(d) rate of overcoming frictionThe question was posed to me in an interview for internship.Enquiry is from Dynamometer Type Wattmeter in chapter Measurement of Power and Related Parameters of Electrical Measurements

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Correct choice is (a) rate of doing WORK

To EXPLAIN: Power is defined as the rate of doing work. The unit of power is watt. In D.C. circuits, power is the product of the VOLTAGE consumed and the CURRENT flowing through a circuit. P = VI watts.
Discussion