Measurements and Instrumentation - ECE Questions and Answers

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

LVDT is used to measure

displacement

pressure

temperature

any of the above

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The scale of PMMC instrument is linear.

True

False

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Assertion (A): Thermistors are commonly used to measure hot spot temperatures in electric machines.

Reason (R): Thermistor has the advantages of high temperature coefficient, small size and high speed of response.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true R is false

A is false R is true

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Absolute instruments are used in

laboratories

industries

power houses

standard laboratories

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Burden of an instrument transformer is expressed in

V-A

watt

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Which of the following devices should be used for accurate measurement of a low dc voltage?

Small range moving coil voltmeter

Dc potentiometer

Small range thermocouple voltmeter

Hot wire instrument

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

If σ is standard deviation, variation is

σ - 1

σ^1.5

σ²

σ³

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

An electrodynamometer instrument has the advantage of

freedom from hysteresis and eddy currents because air cored coils are used

freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material

high torque/weight ratio

low cost

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The dimensions of permittivity are

L^-3M^-1T²Q²

L^-1M^-1T²Q²

L²MT^-1Q^-1

L^-2M^-1T²Q²