QUIZ ON MECHANICAL ENGINEERING MEASUREMENT

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1) The reliability of an instrument mean

1 point

a) The life of the instrument

b) The degree of repeatability within specified limits

c) The time interval between two responses of the instrument

d) None of these

Clear selection

2) Positive displacement flow meters are …………….flow meters.

1 point

a) Variable area flow

b) Differential pressure flow

c) Quantity flow

d) None of these

Clear selection

3) For the analysis of …………. a polarograph is used.

1 point

a) Solids

Gases

Liquids

Moisture content in sand

Clear selection

4) Synchronization in a CRO means

1 point

a)Continuous monitoring of the trace

b) Adjustment of sweep frequency

c) Holding a pattern on the screens without creep

d) All of these

Clear selection

5) The materials used in the manufacture of thermistors are

1 point

a) Oxides of manganese and cobalt

b) Oxides of iron and zinc

c) Carbides of silicon and germanium

d) All of these

Clear selection

6) In a mechanical system, systematic error is produced by

1 point

a) Frictional loading

b) Inertial loading

c) Backlash

d) None of these

Clear selection

7)In a slip gauges a protector is provided to

1 point

a) Clean the slip gauges

b) Take up all the wear when in use

c) Protect the slip gauges when not in use

d) Assemble the slip gauges properly

Clear selection

8) By which of the following dynamometers are performance characteristics of pumps and compressors determined?

1 point

a) Driving dynamometer

b) Absorption dynamometer

c) Transmission dynamometer

d) None of these

Clear selection

9) Which among the following statements is correct about LVDT?

1 point

a) It converts pressure into electrical output

b) It converts strain into electrical output

c) It converts linear displacement into electrical signal

d) All of these

Clear selection

10) A strain gauge should have a high value of gauge factor

1 point

a) To reduce hysteresis effects

b) To give a linear relation between applied strains and resistance change

c) To increase sensitivity

d) To reduce or eliminate the effect of variation in ambient temperature

Clear selection

11) The hot wire anemometer used for measuring gas velocities is a

1 point

a) Variable inductance transducer

b) Variable resistance transducer

c) Variable frequency transducer

d) Variable capacitance transducer

Clear selection

12) …………… is measured by a piezometer tube.

1 point

a) Dynamic pressure of a moving stream

b) Undisturbed fluid pressure

c) Gauge pressure in static mass of fluid

d) Pressure difference between two fluids

Clear selection

13) Among the following which statement about a ‘reliable instrument’ is correct?

1 point

a) It gives reproducible results within specified limits

b) It has errors of same size and sign under the same working conditions

c) It has good frequency response

d) It gives linear characteristics within the entire range

Clear selection

14) The function of the intermediate stage of an instrument is

1 point

a) To provide a record or indication of the measurement

b) To condition and transmit the signal after it has been transduced

c) To give a signal that the desired value has been reached.

d) All of these

Clear selection

15) In which of the following aspects micrometer is superior to vernier calliper?

1 point

a) It is easier and quicker to use

b) It is more accurate

c) It can be used to make both inside and outside measurements over a range of sizes

d) All of these

Clear selection

16) In limits and fits the term ‘allowance’ usually refers to

1 point

a) Maximum clearance between shaft and hole

b) Minimum clearance between shaft and hole

c) Difference between maximum size and minimum size of the shaft

d) Difference between maximum size and minimum size of the hole

Clear selection

17) For which of the following cases is a dimension expressed as 11+0.00-0.05

1 point

a) Limiting dimension

b) Unilateral dimension

c) Bilateral dimension

d) None of these

Clear selection

18) ……………….. can be measured by straight edges

1 point

a) Circularity

b) Flatness

c) Parallelism

d) Straight length of parts

Clear selection

19) Tomlinson recorder is used to measure surface

1 point

a) Curvature

b) Finish

c) Perpendicularity

d) Flatness

Clear selection

20) The use of a plug gauge is

1 point

a) To measure screw threads

b) To measure angles

c) To measure cylindrical bores

d) To measure spherical holes

Clear selection

21) The sensitivity of reading of manometer can be decreased

1 point

a) By using a level sensing device

b) By using low specific gravity liquid

c) By inclining the mamometer tube

d) None of these

Clear selection

22) The use of a dead weight tester is to

1 point

a) Calibrate pressure measuring instruments

b) Produce high pressure

c) Measure the load accurately

d) Test the magnitude of given weight

Clear selection

23) The resolution of a system refers to

1 point

a) Difference between the true and measured value of the process variable

b) Smallest change of input for which there will be change of output

c) Retardation of the response

d) All of these

Clear selection

24) A CRO uses which of the following

1 point

a) Electromagnetic focusing

b) Electrostatic focusing

c) Both (a) and (b)

d) None of these

Clear selection

25) For a thermistor, its resistance

1 point

a) Does not change with change in temperature

b) Increases with decrease in temperature

c) Decreases with decrease in temperature

d) None of these

Clear selection

26) ‘Dead zone’ of an instrument is

1 point

a) The largest change of input quantity for which there is no output of instrument

b) Time required by instrument system to begin to respond to a change in measurand

c) The unmeasured quantity which is more than the maximum range of the instrument

d) None of these

Clear selection

27) For an instrument, the ratio of maximum displacement deviation to full scale deviation is called as

1 point

a) Linearity

b) Static sensitivity

c) Dynamic deviation

d) Precision

Clear selection

28) The static error band of an instrument implies

1 point

a) The accuracy of the instrument

b) Unrepeatability of the instrument

c) The error introduced in low varying inputs

d) The error produced when the pen is stopped at some deflection

Clear selection

29) For which of the following reasons is a dummy strain gauge used?

1 point

a) Compensate for temperature variations

b) Increase the sensitivity of the measuring instrument

c) Improve the stability of the system

d) All of the above

Clear selection

30) What do you mean by ‘discrepancy’?

1 point

a) It is the difference between two measured values of the same quantity

b) It is the difference between the measured value and actual value

c) It is the difference between true value of the quantity and error

d) None of the above

Clear selection

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