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Q1. | When an alternating current passes through an ohmic resistance the electrical power converted into heat is |

A. | Apparent power [Wrong Answer] |

B. | True power [Correct Answer] |

C. | Reactive power [Wrong Answer] |

D. | None of the above [Wrong Answer] |

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

⇒ A resonance curve for a series circuit is a plot of frequency versus

Current

Voltage

Impedance

Reactance

⇒ 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 the R - L - C containing R = 4.5ω L = 0.06 H,C = 0.6 µF the power factor will be

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

Electronic equipment

Transformers

Current transformers

Auto-transformers

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

4 mA

9 mA

15 mA

25 mA

⇒ A sine wave of voltage varies from zero to maximum of 200 V. How much is the voltage at the instant of 30° of the cycle ?

50V

82.8V

100V

173.2 V

⇒ The series element of a band stop filter is

Capacitive

Inductive

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 power factor at resonance in RLC parallel circuit is

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⇒ The r.m.s. value of a sine wave is 100A. Its peak value is

70.7 A

141.4A

150A

282.8 A

⇒ 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

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

Zero

0.5

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⇒ A coil with large distributed capacitance has a

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Low quality factor

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⇒ In a purely inductive circuit

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None of these

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

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Wattless component

Any of the above

None of these

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Overloading of altemators

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Reduction in load handling capacity of electrical system

⇒ How much r.m.s. current does a 300 W. 200V bulb take from the 200 V, 50 Hz power line ?

0.5A

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3A

⇒ A heater is rated as 230 V, 10 KW, AC. The value 230 V refers t

Average voltage

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Peak voltage

None of these

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

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⇒ Capacitive reactance is more when

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⇒ In a R-L-C series circuit if voltage V across the circuit is reduced to half the current I will change to

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

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High power factor

Unity power factor

Maximum Load current

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

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None of these

⇒ Ohm is the unit of all of the following except

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Capacitive reactance

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⇒ In a circuit containing R, L and C, power loss can take place

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R only

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⇒ In a series resonant circuit, the impedance of the circuit is

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Zero

Infinite

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

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Half the frequency of the voltage

None of these

⇒ 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