MEASURING INSTRUMENTS - Quiz

1) What is the reason for the moving coil meter having uniform scale?

Deflecting torque is directly proportional to the current Deflecting torque is inversely proportional to the current Deflecting torque is inversely proportional to the square of the current Deflecting torque is directly proportional to the square of the current

2) Which error if the energy meter disc rotating continuously on no load?

Speed error Phase error Friction error Creeping error

3) What is the effect on CT if its secondary is kept open?

CT primary burns out Volt ampere capacity reduces Volt ampere capacity increases CT secondary winding burns out

4) What is the purpose of variable resistor connected across shunt type ohm meter?

Avoid draining of battery Minimize the error in reading Adjust the current to safe value Adjust the pointer to zero adjustment

5) Which material is used to make control spring in measuring instruments?

Steel Silver Tinned copper Phosphor bronze