A coil (which can be modelled as a series RL circuit) has been designed for a high Quality Factor (Q) performance. The voltage is rated at and a specified frequency. If the frequency of operation is increased 10 times and the coil is operated at the same rated voltage. The new value of Q factor and the active power P will be?

P remains constant and Q is doubled

P decreases 100 times and Q is increased 10 times

Explore topic-wise MCQs in Network Theory.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.

1.	A coil (which can be modelled as a series RL circuit) has been designed for a high Quality Factor (Q) performance. The voltage is rated at and a specified frequency. If the frequency of operation is increased 10 times and the coil is operated at the same rated voltage. The new value of Q factor and the active power P will be?
A.	P is doubled and Q is halved
B.	P is halved and Q is doubled
C.	P remains constant and Q is doubled
D.	P decreases 100 times and Q is increased 10 times
Answer» E.

Discussion

2.	A 50 F capacitor, when connected in series with a coil having a resistance of 40 , resonates at 1000 Hz. The inductance of the coil for the resonant circuit is ____________
A.	2.5 mH
B.	1.2 mH
C.	0.5 mH
D.	0.1 mH
Answer» D. 0.1 mH

Discussion

3.	A circuit tuned to a frequency of 1.5 MHz and having an effective capacitance of 150 pF. In this circuit, the current falls to 70.7 % of its resonant value. The frequency deviates from the resonant frequency by 5 kHz. Effective resistance of the circuit is?
A.	2
B.	3
C.	5.5
D.	4.7
Answer» E.

Discussion

Explore topic-wise MCQs in Network Theory.

A 50 F capacitor, when connected in series with a coil having a resistance of 40 , resonates at 1000 Hz. The inductance of the coil for the resonant circuit is ____________

A circuit tuned to a frequency of 1.5 MHz and having an effective capacitance of 150 pF. In this circuit, the current falls to 70.7 % of its resonant value. The frequency deviates from the resonant frequency by 5 kHz. Effective resistance of the circuit is?