Electrical & Electronic measuring instruments Quiz2

Unit of capacitive reactance is

• Farad

• ohm

• watts

• Henry

The type of damping used in moving iron instruments is

• eddy current damping

• air friction damping

• fluid friction damping

• no damping

The resistance of an ideal voltmeter is

• zero

• infinity

• above 1000 ohm

• below 5 ohm

In two wattmeter method of power measurement,if one of the wattmeter reads zero,that means

• pf is 0.5

• pf is unity

• pf is zero

• cannot be determined

The earth resistance of a household should be

• below 100ohms

• below 5 ohms

• above 100 ohms

• above 100kohms

The current coil and pressure coil inside a wattmeter can be distinguished by

• thicker wire is current coil

• thicker wire is pressure coil

• cannot be distinguished

• none of the above

An electric iron box is rated 1000Watts.if it is used for 30 minutes,energy consumed is

• 0.5 units

• 1 unit

• 2 unit

• 4 unit

Which of the following instruments have a uniform scale?

• PMMC instrument

• MI instrument

• Electrodynamic instrument

• Induction type energymeter

The springs that provide controlling torque in an indicating instrument is made of

• Manganin

• Phospor bronze

• tin

• lead

Which of the following is a recording instrument?

• voltmeter

• Energymeter

• ECG

• wattmeter