MENSURATION & INSTRUMENTATION MCQS SET 08

MENSURATION & INSTRUMENTATION MCQS SET 08

1)   A deflection of 90 degree is produced when a current of 10 A flows through the circuit and the torque of the ammeter vary as the square of the current through it. If a current of 8 A flows through it, then the deflection obtained when the instrument is spring controlled and when the instrument is gravity controlled are
a. 39.79 degree, 57.6 degree
b. 47.55 degree, 35.67 degree
c. 57.6 degree, 39.79 degree
d. 35.67 degree, 47.55 degree
ANSWER: 57.6 degree, 39.79 degree
 

2)   The gravity controlled instruments has to be kept
a. Vertical
b. Horizontal
c. Inclined at 45 degree
d. Inclined at 75 degree
ANSWER: Vertical
 

3)   Random errors in a measurement system are due to
a. Environmental changes
b. Use of uncalibrated instrument
c. Poor cabling practices
d. Unpredictable effects
ANSWER: Unpredictable effects
 

4)   Calibration of instrument is an important consideration in measurement system. The errors due to instruments being out of calibration can be rectified by
a. Increasing the frequency of recalibration
b. Increasing the temperature coefficient
c. Increasing the susceptibility of measuring instrument
d. Decreasing the frequency of recalibration
ANSWER: Increasing the frequency of recalibration 

5)   The undesirable characteristics of a measuring system is / are
a. Drift
b. Dead zone
c. Non linearity
d. All of these
ANSWER: All of these
 

6)   If the instrument is used in wrong manner while application, then it will results in
a. Systematic error
b. Instrument error
c. Random error
d. Environmental error
ANSWER: Instrument error
 

7)   Suitable method for the reduction of systematic errors is / are
a. Instrument must be designed carefully
b. By introducing an equal and opposite environmental input for compensating the effect of environmental input in a measurement system
c. By adding high gain feedback to measurement system
d. All of these
ANSWER: All of these
 

8)   The systematic errors of an instrument can be reduced by making
a. The sensitivity of instrument to environmental input as low as possible
b. The sensitivity of instrument to environmental input as high as possible
c. Systematic errors does not depend on the sensitivity of instrument
d. None of these
ANSWER: The sensitivity of instrument to environmental input as low as possible
 

9)   The magnitude of environment - induced variation from the specified calibration condition is quantified by
a. Sensitivity drift
b. Zero drift
c. Backlash
d. Both (a) & (b)
ANSWER: Both (a) & (b)
 

10)   In a moving coil voltmeter, the input resistance of the meter can be increased by
a. Increasing the number of turns in the coil
b. Decreasing the number of turns in the coil
c. Using the same number of coil turns made up of high resistance material
d. Both (a) & (c)
ANSWER: Both (a) & (c)