Electrical Circuits (B) - Quiz 1

70 Questions | By ECE2015 | Updated: Mar 20, 2022 | Attempts: 472

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Questions and Answers

1.

When two loops with or without contacts between them affect eachother through the magnetic field generated by one of them, they aresaid to be magnetically coupled.
- A.
  
  True
- B.
  
  False
2.

The resonant circuit consists only of a capacitor with a voltage or current source.
- A.
  
  True
- B.
  
  False
3.

This curve is for bandstop filter
- A.
  
  True
- B.
  
  False
4.

The resonant circuit consists only of inductor with a voltage or current source.
- A.
  
  True
- B.
  
  False
5.

This curve indicates that power willbe a maximum at fr and varying thefrequency in either direction resultsin a rise of the power.
- A.
  
  True
- B.
  
  False
6.

The value of ω that satisfies this condition is called the resonant frequency
- A.
  
  True
- B.
  
  False
7.

The bandwidth is the average between the half power points on the response curve of the filter.
- A.
  
  True
- B.
  
  False
8.

The total impedance of RLC parallel circuit is given in the shown relation
- A.
  
  True
- B.
  
  False
9.

The phase of The current across coil in series resonant circuit is +90 when the supply is 5Sinωt
- A.
  
  True
- B.
  
  False
10.

In RLC series resonance the Magnitude of inductive reactance must Eliminates the Magnitude of capacitive reactance to result a pure inductor
- A.
  
  True
- B.
  
  False
11.

Since the current is maximum at resonance,it follows that the power must similarly be maximum at resonance.
- A.
  
  True
- B.
  
  False
12.

The power response of a series resonant circuit has a bell-shaped curve called the selectivity curve.
- A.
  
  True
- B.
  
  False
13.

If the bandwidth of a circuit is kept very narrow , the circuit is said to have a Low selectivity
- A.
  
  True
- B.
  
  False
14.

The Bandwidth of the resonant circuit (BW) is The difference between the frequencies at which the circuit delivers half of the maximum power.
- A.
  
  True
- B.
  
  False
15.

The resonant frequency is the geometric mean of the half-power frequencies. The resonant frequency is the geometric sum of the half-power frequencies.
- A.
  
  True
- B.
  
  False
16.

The “sharpness” of the resonance in a resonant circuit is measured quantitatively by the quality factor Q.
- A.
  
  True
- B.
  
  False
17.

The quality factor of resonance circuit doesn't depent on resistance
- A.
  
  True
- B.
  
  False
18.

In series resonance, The higher the value of Q , the more selective the circuit is but more bandwidth.
- A.
  
  True
- B.
  
  False
19.

In series resonance, If the band of frequencies to be selected or rejected is narrow, the quality factor of the resonant circuit must be high.
- A.
  
  True
- B.
  
  False
20.

At parallel resonance, the admittance consists only conductance G = 1/2R.
- A.
  
  True
- B.
  
  False
21.

At parallel resonance,The value of current will be minimum since the total admittance is maximun
- A.
  
  True
- B.
  
  False
22.

At parallel resonance,The Power factor is unity.
- A.
  
  True
- B.
  
  False
23.

At parallel resonance, The currents through the inductor and the capacitor have the same magnitudes but are 90 out of phase.
- A.
  
  True
- B.
  
  False
24.

The magnitude of current in the reactive elements at parallel resonance is Q times Lower than the applied source current.
- A.
  
  True
- B.
  
  False
25.

In practical parallel resonance , if the internal resistance of the coil is negligable , so the resonance frequency of the circuit will be equal to the resonant frequency of ideal parallel resonance
- A.
  
  True
- B.
  
  False