Electrical instruments and Measurement MCQs - p1

01. A measuring system consists of

Sensors

Variable conversion elements

Signal processing elements

All of these


02. An instrument in which the value of ethnical quantity to be measured can be determined from the deflection of the instrument when it has been precalibrated by comparison with an absolute instrument

Absolute instrument

Secondary instrument

Recording instrument

Integrating instrument


03. A pointer of an instrument once deflected returns to zero position, when the current is removed due to

Action of gravity

Mass of the pointer

Controlling Torque

Damping Torques


04. In hot wire instrument, the sensing wire is made of

Copper

Silver

Platinum-iridium

Copper-Nickel


05. An ammeter

Is inserted in series in a circuit and current to be measured flows through it

Is inserted in series in a circuit and part of the current to be measured flows through it

Is connected in parallel in a circuit and current to be measured flows through it

Is connected in parallel in a circuit and only part of the current to the measured flows through it.


06. Which of the following material will be preferred as a shunt for extending the range of measurement of a voltmeter

Copper

Steel

Aluminum

Manganin


07. What should be the size of the slide wire of the potentiometer to make it to achieve high accuracy?

As long as possible

As short as possible

1 meter

Neither too thin nor too thick


08. Which of the following is not an integrating instrument?

Ampere-hour meter

Watt-hour meter

Voltmeter

All of the above


09. The deflecting torque in an instrument may be produced

Magnetically

Electrostatically

Thermally

Any of the above


10. The advantages of moving coil permanent magnet type instrument are

Low power consumption

No hysteresis loss

Efficiency eddy current damping

All of the above


11. In eddy-current damping systems, the disc is usually made of

Non-conducting and Non-magnetic material

Non-conducting and magnetic material

Conducting and magnetic material

Conducting and Non-magnetic material


12. Which of the following types of instrument can be used for D.C only?

Moving iron attraction type

Moving Iron repulsion type

Permanent magnet type

Hotwire type


13. Which type of wattmeter cannot be used for both A.C and D.C?

Dynamometer type

Electrostatic type

Induction Type

None of the above


14. A moving iron type ammeter has few turns of thick wire so that

Resistance is less

Sensitivity is high

Damping is effective

Scale is large


15. Which of the following types of instrument can’t be used fo D.C

Moving iron-attraction type

Moving coil permanent magnets type

Hotwire type

Induction type

Read more» electrical-instruments-and-measurement-mcqs

Post a Comment

Previous Post Next Post