ELECTRICIAN 2ND TEST

.Which electrical effect that the single phase energy meter works?

• Heating effect

• Induction effect

• Chemical effect

• Electrostatic effect

What is the unit of sensitivity in instruments?

• Volt / ohm

• Ohm / volt

• Ohm / metre

• Ohm / metre

Which force is required to move the pointer from zero position in an indicating instrument?

• Controlling force

• Deflecting force

• Air friction damping

• Eddy current damping

Which is the position to use the instrument provided with gravity control?

• Any position

• Vertical position

• Inclined position

• Horizontal position

Which instrument is used to measure one ohm and below one ohm resistance value accurately? Ans C

A B C D

• Megohm meter

• Multimeter (analog)

• Shunt type ohm meter

• Series type ohm meter

What is the purpose of the 3rd terminal provided in a advanced megohm meter (Megger) ?

• Get higher ohmic values

• Pass the excess voltage to ground

• Pass the excess current to ground

• Get accurate readings without oscillation

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

. 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

Which type of instrument is used with air friction damping?

• Moving coil instrument

• Moving iron instrument

• Induction type instrument

• Dynamo meter type instrument

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

• Steel

• Silver

• Tinned copper

• Phosphor bronze