ELECTRICAL INSTRU & FEEDBACK CONTROL OBJCTVS

which of the following can be used to measure small dc generated voltages?

• galvanometer

• thermocouple

• pyrometer

• voltmeter

if moving-iron type ammeter is connected to a circuit, and then its connection was interchanged, THEN

• it will give no deflection

• it will deflect in opposite direction

• its reading will not changed

• it will burn out

an electrodynamic meter can be used to measure _____

• AC voltage

• DC voltage

• AC as well as DC voltage

• DC voltage but for AC voltage needs rectification

for measuring the resistance of the elements of an attenuator which of the following is the best choice?

• maxwell bridge

• ohmmeter

• megger

• wheatstone bridge

the most efficient form of a damping employed in electrical measuring insturment is ___

• air friction

• fluid friction

• eddy current

• none of these

due to which of the following reason excessive bandwith in control system should be avoided?

• has no considerable effect

• it leads to slow speed response

• it leads to a low relative stability

• noise is proportional to band width

a good control system will have ALL the following features EXCEPT:

• good accuracy

• sufficient power handling capacity

• slow response

• good stability

a power-amplifying feedback control system where in the controlled variable is mechanical position or a time derivative of position such as velocity or acceleration is _____

• timer

• regulator

• servomechanism

• automation

is that part of the total response which does not approach zero as time approaches infinity?

• steady state

• transient

• signal

• force

is that part of the total response which approaches zero as time approaches infinity?

• steady state

• transient

• signal

• force