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A.C. Fundamentals

A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?

A.C. Fundamentals, Circuits and Circuit Theory /
A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?

A. the big size of the inductor
B. the reactance of the inductor
C. the current flowing in the inductor
D. the statement given is false

A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________? Read More »

A.C. Fundamentals, Circuits and Circuit Theory

The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?

A.C. Fundamentals, Circuits and Circuit Theory /
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?

A. iron loss in core
B. skin effect
C. increase in temperature
D. capacitive effect between adjacent coil turns

The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________? Read More »

A.C. Fundamentals, Circuits and Circuit Theory

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

A.C. Fundamentals, Circuits and Circuit Theory /
The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

A. 4 kVAR
B. 6 kVAR
C. 8 kVAR
D. 16 kVAR

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________? Read More »

A.C. Fundamentals, Circuits and Circuit Theory

Wire-wound resistors are unsuitable for use at high frequencies because they_______?

A.C. Fundamentals, Circuits and Circuit Theory /
Wire-wound resistors are unsuitable for use at high frequencies because they_______?

A. create more electrical noise
B. are likely to melt under excessive eddy current heat
C. consume more power
D. exhibit unwanted inductive and capacitive effects

Wire-wound resistors are unsuitable for use at high frequencies because they_______? Read More »

A.C. Fundamentals, Circuits and Circuit Theory

Which of the following statements pertains to resistors only _____________?

A.C. Fundamentals, Circuits and Circuit Theory /
Which of the following statements pertains to resistors only _____________?

A. can dissipate considerable amount of power
B. can act as energy storage devices
C. connecting them in parallel in¬creases the total value
D. oppose sudden changes in voltage

Which of the following statements pertains to resistors only _____________? Read More »

A.C. Fundamentals, Circuits and Circuit Theory