Instruments and measurements objective questions with explanations

 Instruments and measurements objective questions with explanations

Q no 1 . A ……….device prevents the oscillation of the moving system and enables the latter to reach its                                                                                                                          final  position quickly.

a ) deflecting

b ) controlling

c ) damping

d ) any of the above

explanation

                 answer   c ) damping

Q no 2 . A moving-coil  permanent magnet instrument can be used as ………by using low resistance shunt

a ) ammeter

b ) voltmeter

c ) flux meter

d )ballistic galvanometer

explanation

                 answer   a ) ammeter

Q no 3 . A moving- coil permanent magnet instrument can be used as flux- meter

a ) by using a low resistance shunt

b ) by using high series resistance

c ) by eliminating the control spring

d ) by making control springs of large moment of inertia

explanation

                 answer   c ) by eliminating the control spring

Q no 4 . The chemical effect of current is used in

a ) D.C ammeter hour meter

b ) D.C ammeter

c ) D.C energy meter

d ) none of the above

explanation

                 answer   a ) D.C ammeter hour meter

Q no 5 . In majority of instruments damping is provided by

a ) fluid friction

b ) spring

c ) eddy current

d ) all of the above

explanation

                 answer   c ) eddy current

Q no 6 . An ammeter is a

a ) secondary instrument

b ) absolute instrument

c ) recording instrument

d ) integrating instrument

explanation

                 answer   a ) secondary instrument

Q no 7 . In a portable instrument ,the controlling torque is provided by

A ) spring

B ) gravity

C ) eddy currents

D ) all of the above

explanation

                 answer   A ) spring