Measurements and Instrumentation - Engineering

Q1:

The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10-6 N-m on full scale. If B = 1 Wb/m2, range of meter is

A 1 mA

B 2 mA

C 3 mA

D 4 mA

ANS:B - 2 mA

NBAI = Controlling torque or = 240 x 10-6 or I = 2 mA.