# Measurement and Instrumentation

Measurement and Instrumentation
Question:-
Option (A)
1, 2 and 3
Option (B)
1, 2 and 4
Option (C)
2, 3 and 4
Option (D)
1, 3 and 4
Correct Option:
B
Question Solution:
Thermistor is a semiconductor device which is non-linear and highly sensitive as well as exhibit negative resistance-temperature coefficient. Thermistors having positive resistance temperature coefficient are not useful as temperature transducers.
Question:-
Option (A)
Slow changing
Option (B)
Of small bandwidth
Option (C)
Slow changing and has a small bandwidth
Option (D)
Fast changing and has a wide a wide bandwidth
Correct Option:
C
Question Solution:
Refer explanation for question no. –1 for TDM.
Question:-
Option (A)
Option (B)
Option (C)
Adjustment the position of braking magnet and moving it closer from the centre of the disc
Option (D)
Adjusting the position of braking magnet and moving it away from the centre of the disc
Correct Option:
D
Question Solution:
Braking torque TD a R2 where R is the radial position of braking magnet with respect to the centre of the disc
Question:-
Option (A)
Saw tooth generator
Option (B)
Differential amplifier
Option (C)
Sample and hold circuit
Option (D)
Schmitt trigger
Correct Option:
D
Question:-
Option (A)
Narrow band superheterodyne receiver and CRO
Option (B)
Signal generator and CRO
Option (C)
Oscillator and wave analyser
Option (D)
VTVM and CRO
Correct Option:
A
Question:-
Option (A)
Both A and R are true and R is the correct explanation of A
Option (B)
Both A and R are true but R is not the correct explanation A
Option (C)
A is true but R is false
Option (D)
A is false but R is true
Correct Option:
A
Question Solution:
For a high sensitivity, the input voltage should be large and this calls for a high value of resistance of potentiometer Rp. On the other if we consider the linearity the resistance of potentiometer Rp should be as low as possible the resistance of the potentiometer Rp cannot be made low because if we do so the power dissipation goes up with the result that we have to make the input voltage small to keep the power dissipation to the acceptable level. This results in lower sensitivity. Thus linearity & sensitivity are therefore two conflicting requirements. In fact, for good linearity the ratio Rm/Rp should be as large as possible where Rm is finite input resistance of the voltmeter