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Q1. | The frequency of domestic power supply in India is |

A. | 200 Hz [Wrong Answer] |

B. | 100 Hz [Wrong Answer] |

C. | 60 Hz [Wrong Answer] |

D. | 50 Hz [Correct Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ 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

⇒ 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

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

4 mA

9 mA

15 mA

25 mA

⇒ Which of the following statement is incorrect ?

Resistance is a passive element

Voltage source is an active element

Conductance is a passive element

Current source is a passive element

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

Electronic equipment

Transformers

Current transformers

Auto-transformers

⇒ The power factor at resonance in RLC parallel circuit is

Zero

0.08 Lagging

0.8 Leading

Unity

⇒ Capacitors for power factor correction are rated in

kW

kVA

kV

kVAR

⇒ 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

⇒ 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

⇒ 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

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

Impedance

Susceptance

Quality factor

Selectivity

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

Apparent power

True power

Reactive power

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

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141.4V

282.8V

200 V

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

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Inductance only

Capacitance only

None of the above

⇒ 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

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

Square wave

Sine wave

Half wave rectifier sine wave

Triangular wave

⇒ The series element of a band stop filter is

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Parallel combination of L and C

Series combination of L and C

⇒ The time period of a sine wave is 1/50 seconds. Its frequency is

20 Hz

30 Hz

40 Hz

50 Hz

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

R/C

RC

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⇒ The r.m.s. value of pure cosine function is

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0.707 of peak value

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

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⇒ The dual of a loop is

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Mesh

Tree

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

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Inductive

Capacitive

None of these

⇒ The double energy transient occur in the

Purely inductive circuit

R-L circuit

R-C circuit

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⇒ In a purely inductive circuit

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Reactive power is zero

Apparent power is zero

None of these

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

Very low

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Medium

High

⇒ In A.C. circuit the power curve is a sine wave having

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Half the frequency of the voltage

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

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Leading

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⇒ The shunt element in a band pass filter is

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Series combination of L and C

⇒ At half power points of a resonance curve, the current is____ times the maximum current.

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1/ √2

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2