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Q1. | Poor power factor results in all of the following EXCEPT. |

A. | Overloading of transformers [Wrong Answer] |

B. | Overloading of altemators [Wrong Answer] |

C. | Reduction in power losses [Correct Answer] |

D. | Reduction in load handling capacity of electrical system [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :Arundeep Said on 2015-12-20 21:21:08power losses deacrease !! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ The frequency of domestic power supply in India is

200 Hz

100 Hz

60 Hz

50 Hz

⇒ Form factor for a sine wave is

1.414

0.707

1.11

0.637

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

Capacitance only

Inductance only

Resistance only

All above

⇒ Capacitive reactance is more when

Capacitances is less and frequency of supply is less

Capacitance is less and frequency of supply is more

Capacitance is more and frequency of supply is less

Capacitance is more and frequency of supply is more

⇒ In an A.C. circuit I sin Φ is called

Active component

Wattless component

Any of the above

None of these

⇒ The form factor is the ratio of

Peak value to r.m.s. value

r.m.s. value to average value

Average value to r.m.s. value

None of these

⇒ For the same peak value of voltage which wave form will have the least r.m.s. value ?

Sine wave

Square wave

Triangular wave

Full wave rectified sine wave

⇒ The safest value of current the human body can carry for more than 3 second is

4 mA

9 mA

15 mA

25 mA

⇒ Power factor of the following circuit will be zero

Resistance

Inductance

Capacitance

Both (B) and (C)

⇒ In a purely inductive circuit

Actual power is zero

Reactive power is zero

Apparent power is zero

None of these

⇒ The power factor of a series R-L-C circuit at its half-power points is

Unity

Lagging

Leading

Lagging or leading

⇒ The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of____ degrees

90

60

45

30

⇒ At very low frequencies a series R-C circuit behaves as almost purely____

Resistive

Inductive

Capacitive

None of these

⇒ The ratio of active power to apparent power is known as ____ factor.

Demand

Load

Power

Form

⇒ If resistance is 20 ω and inductance is 2H in a RL series circuit, then time constant of this circuit will be

0.001 S

0.1 S

10 S

100 S

⇒ The series element of a band stop filter is

Capacitive

Inductive

Parallel combination of L and C

Series combination of L and C

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

Low

Very low

High

Very high

⇒ What inductance will give the same reactance as a capacitor of 2 µF when both are at 50 Hz?

5 H

10 H

15 H

20 H

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

Electronic equipment

Transformers

Current transformers

Auto-transformers

⇒ The negative maximum of a cosine wave occurs at

30

45

90

180

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

Resistance only

Inductance only

Capacitance only

None of the above

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

Impedances

Reactances

Frequencies

Band widths

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

Zero

0.5

Unity

Infinite

⇒ 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

⇒ For a sine wave with peak value E

_{max}the average value is

0.636 E

_{max}

0.707 E

_{max}

0.434 E

_{max}

1.414 E

_{max}

⇒ The value of operator j2 is equal to

Zero

+1

-1

√-1

⇒ The ratio of the bandwidth to the resonance frequency is called the____ of the circuit.

Impedance

Susceptance

Quality factor

Selectivity

⇒ For the same peak value, which of the following wave has the least mean value ?

Half wave rectified sine wave

Triangular wave

Sine wave

Square wave

⇒ 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

⇒ Capacitors for power factor correction are rated in

kW

kVA

kV

kVAR