MyQuestionIcon

2

You visited us 2 times! Enjoying our articles? Unlock Full Access!

Extension of Ammeter and Voltmeter

For a given f...

Question

For a given frequency, the deflecting torque in an induction type ammeter is directly proportional to

A

c u r r e n t^{2}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

c u r r e n t^{3}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

\sqrt{c u r r e n t}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

c u r r e n t

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $c u r r e n t^{2}$
In induction type meter, rms value is obtained.
$T_{d} = I^{2} . \frac{d m}{d θ}$

Suggest Corrections

thumbs-up

1

Similar questions

Q. For a certain dynamometer ammeter the mutual inductance M varies with deflection

θ

(expressed in degree) as

M = - 6 c o s (θ + 30 °) m H

The deflecting torque produced by a direct current of 50 mA corresponding to a deflection of 60° is

Q. The full-sclae deflecting torque of a 10 ampere moving iron ammeter is

4 \times 10^{- 5} N - m .

The rate of changes of self inductance of instrument at full scale is

Q. A moving iron ammeter has constant rate of change of inductance with respect to deflection equal to

3 μ H / d e g r e e .

The control torque is provided by spring having spring constant equal to

4 \times 10^{- 7} N - m / d e g r e e .

If the maximum deflection of pointer is 120°, then current corresponding to this maximum deflection will be _______A.

Q. The torque of an ammeter varies as the square of the current through it. If a current of 10 A produces a deflection of

90^{o}

. The deflection for a current of 5 A when the instrument is gravity controlled, is _______degrees.

Q. The inductance of a certain moving-iron ammeter is expressed as:

L = 10 + 3 θ - (θ^{2} / 4) μ H

θ

is the deflection in radians from the zero position. The control spring torque in

25 \times 10^{- 6} N m / r a d i a n .

The deflection of the pointer in radian when the meter carries a current of 5 A, is

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Extension of Ammeter and Voltmeter

MEASUREMENT

Watch in App

explore_more_icon

Explore more

Extension of Ammeter and Voltmeter

Other Measurement

Join BYJU'S Learning Program

CrossIcon