Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | In an A.C. circuit, a low value of kVAR compared with kW indicates |

A. | Low efficiency [Wrong Answer] |

B. | High power factor [Correct Answer] |

C. | Unity power factor [Wrong Answer] |

D. | Maximum Load current [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Inductance affects the direct current flow

Only at the time of turning off

Only at the time of turning on

At the time of turning on and off

At all the time of operation

⇒ Power factor of an inductive circuit is usually improved by connecting capacitor to it in

Parallel

Series

Either (A) or (B)

None

⇒ The double energy transient occur in the

Purely inductive circuit

R-L circuit

R-C circuit

R-L-C circuit

⇒ At____ frequencies the parallel R-L circuit behaves as purely resistive.

Low

Very low

High

Very high

⇒ A network is said to be non-linear if it does not satisfy

Homogeneity condition

Superposition condition

Both (A) and (B)

Associative condition

⇒ The voltage of domestic supply is 220 V. This figure represents-

Mean value

r.m.s. value

Peak value

Average value

⇒ In A.C. circuit laminated iron is invariably used in order to

Reduce eddy current loss

Increase heat radiation

Make assembly cheap and easier

Reduce circuit permeability

⇒ The power is measured in terms of decibles in case of

Electronic equipment

Transformers

Current transformers

Auto-transformers

⇒ The value of operator j2 is equal to

Zero

+1

-1

√-1

⇒ Which of the following is not a non-linear element ?

Transistor

Heater coil

Diode

Electric arc with unlike electrodes

⇒ A coil with large distributed capacitance has a

High resonant frequency

Low resonant frequency

Low quality factor

Low resistance

⇒ In an A.C. circuit power is dissipated in

Resistance only

Inductance only

Capacitance only

None of the above

⇒ The r.m.s. value of a half-wave rectified current is 100 A. Its value for full-wave rectification would be____ amperes.

141.4

200

200/π

40/π

⇒ For the full wave rectified sine wave the r.m.s. value is

0.707 I

_{max}

0.636 I

_{max}

0.318 I

_{max}

Zero

⇒ In a pure resistive circuit

Current lags behind the voltage by 90°

Current leads the voltage by 90°

Current can lead or lag the voltage by 90°

Current is in phase with the voltage

⇒ The form factor of D.C. supply voltage is always

Zero

0.5

Unity

Infinite

⇒ Which of the following waves has the highest value of peak factor '?

Square wave

Sine wave

Half wave rectifier sine wave

Triangular wave

⇒ Selectivities of different resonance circuits are compared in terms of their

Impedances

Reactances

Frequencies

Band widths

⇒ The transient currents are associated with the

Changes in the stored energy in the inductors and capacitors

Impedance of the current

Applied voltage to the circuit

Resistance of the circuit

⇒ All the rules and laws of D.C. circuit also supply to A.C. circuit containing

Capacitance only

Inductance only

Resistance only

All above

⇒ Two sinusoidal quantities are said to be phase quadrature, when their phase difference is

0

30°

45°

90°

⇒ The product of apparent power and cosine of the phase angle between circuit voltage and current is

True power

Reactive power

Volt-amperes

Instantaneous power

⇒ In a purely inductive circuit

Actual power is zero

Reactive power is zero

Apparent power is zero

None of these

⇒ The time constant of a series R-C circuit is given by

R/C

RC

^{2}

RC

R

^{2}C

⇒ Skin effect occurs when a conductor carries current at____ frequencies.

Very low

Low

Medium

High

⇒ In a parallel R-C circuit, the current always ____the applied voltage.

Lags

Leads

Remains in phase with

None of the above

⇒ The peak value of a sine wave is 200 V. Its average value is

127.4V

141.4V

282.8V

200 V

⇒ A parallel resonant circuit can be used

As a high impedance

To reject a small band of frequencies

Both (A) and (B)

To amplify certain frequencies

⇒ For the same peak value which of the following wave will have the highest r.m.s. value ?

Square wave

Half wave rectified sine wave

Triangular wave

Sine wave

⇒ When an alternating current passes through an ohmic resistance the electrical power converted into heat is

Apparent power

True power

Reactive power

None of the above