Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 78

EASY

NEET

IMPORTANT

Earn 100

The self-inductance of the motor of an electric fan is $10 H$ . In order to impart maximum power at $50 Hz$ , it should be connected to a capacitance of,

57.14% studentsanswered this correctly

Important Questions on Alternating Current

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 79

In an

L - C - R

circuit capacitance is changed from

C

to

2 C

. For the resonant frequency to remain unchanged, the inductance should be changed from

L

to

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 80

The value of inductance

L

for which the current is maximum in series

L C R

circuit with

C = 10 μ F

and

ω = 1000 rad s^{- 1}

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 81

For an A.C. circuit at the condition of resonance-

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 82

A series ac circuit consist of an inductor and a capacitor. The inductance and capacitance is respectively

1 henry

and

25 μF

. If the current is maximum in circuit then angular frequency will be

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 83

The value of power factor

\cos ϕ

in the series

LCR

circuit at resonance is,

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 84

A series

LCR

circuit containing a resistance of

120 Ω

has angular resonance frequency

4 \times 10^{3} rad s^{- 1}

. At resonance, the voltage across resistance and inductance are

60 V and 40 V

, respectively. The values of

L

and

C

are, respectively,

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 85

In an LCR circuit, the capacitance is made one-fourth, when in resonance. Then what should be the change in inductance, so that the circuit remains in resonance?

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 86

A resistor

R,

an inductor

L

and a capacitor

C

are connected in series to an oscillator of frequency

n

. If the resonant frequency is

n_{r}

, then the current lags behind voltage, when