Instruments are subdivided into active and passive based on whether the output of instrument is produced by the quantity being measured simply changes the magnitude of some external power source. The pressure measuring device and the float-type petrol tank level indicator are example of

Considering cost of instruments, which is a better choice, active or passive?

A. Active instruments

B. Passive instruments

C. Cost of both active and passive instruments are approximately same

D. None of these

In deadweight gauge, weights are added on the top of piston until the piston reaches a datum level. The datum level is known as

A. Null point, where the downward force balances the fluid pressure

B. Lowest point of the container

C. Highest level of fluid in the container

D. None of these

The accuracy of the deflection type instruments and of the null type instruments depends on

A. Linearity, calibration of spring

B. Calibration of spring, linearity and calibration of weights

C. Linearity and calibration of spring, calibration of weights

D. Both depends on calibration of weight

In terms of usage, deflection type instruments are

A. More convenient than null type instrument

B. Less convenient than null type instruments

C. Both are equally convenient

D. None of these

The output of an analogue instrument varies

A. Continuously and can have an infinite number of values within its range of instruments

B. In discrete steps and can have an infinite number of values within its range of instruments

C. Continuously and can have an finite number of values within its range of instruments

D. In discrete steps and can have an infinite number of values within its range of instruments