Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 26

MEDIUM

NEET

IMPORTANT

Earn 100

In a series LR circuit, the voltage drop across inductor is $8$ volt and across resistor is $6$ volt. Then voltage applied and power factor of circuit respectively are:

50% studentsanswered this correctly

Important Questions on Alternating Current

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 27

In an a.c. circuit the e.m.f.

(e)

and the current

(i)

at any instant are given respectively by:

e = E_{0} \sin ω t

i = I_{0} \sin (ω t - ϕ)

The average power in the circuit over one cycle of a.c. is :

EASY

NEET

IMPORTANT

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

The power factor of an AC circuit having resistance

(R)

and inductance

(L)

connected in series and an angular velocity

ω

is

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 29

The average power delivered to a series AC circuit is given by (symbols have their usual meaning):

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 30

The potential difference $V$ across and the current $I$ flowing through an instrument in an AC circuit are given by:

$V = 5 \cos ω t volt$

$I = 2 \sin ω t A$

The power dissipated in the instrument is :

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 31

A direct current of

2 A

and an alternating current having a maximum value of

2 A

flow through two identical resistances. The ratio of heat produced in the two resistances will be,

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 32

A sinusoidal AC current flows through a resistor of resistance

R

. If the peak current is

I_{p},

then average power dissipated is:

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 33

If a current

i

given by

i = i_{0} \sin (ω t - \frac{π}{2})

flows in an A.C. circuit across which an A.C. potential of

e = e_{0} \sin ω t

has been applied, then the power consumption

P

in the circuit will be:

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 34

If the frequency of the source emf in an AC circuit is

n

, the power varies with a frequency :