Process Instrumentation and Control - Mechanical Engineering Multiple Choice Questions and Answers for competitive exams

1.    A device for determining die value or magnitude of a quantity or variable :
(a)     sensor   
(b)     transducer
(c)     gauge   
(d)     instrument
(e)     indicator.

Ans: d

2.    Determining moisture in steam by measuring the temperature in a throttling calorimeter is an example of :
(a)    direct measurement
(b)    indirect measurement
(c)    measurement by comparison
(d)    measurement by calibration
(e)    automatic measurement.

Ans: b

3.    The closeness with which the reading of an instrument approaches the true value of the variable being measured is called :
(a)     accuracy   
(b)     precision
(c)     sensitivity      
(d)     resolution
(e)     discrimination.

Ans: a

4.    Errors due to assignable causes are called :
(a)     static errors    
(b)     systematic errors
(c)    calibration errors
(d)    random errors
(e)    known errors.

Ans: b

5.    Pick up the appropriate word for A pointer moving over a scale :
(a)     instrument     
(b)     indicator
(c)     transducer      
(d)     gauge
(e)     recorder.

Ans: b

6.    Pick up the appropriate word for A reading obtained from the motion of a pointer on a scale :
(a)     analog   
(b)     digital
(c)     display   
(d)     indicator
(e)     instrument.
Ans: a

7.    Pick up the appropriate word for The reading displayed as a number, a series of holes on a punched card, or a sequence of pulses on magnetic tape :
(a)     pulse train      
(b)     digital
(c)     analog   
(d)     numeral
(e)     recording.
Ans: b

8.    For studying detailed variations with time, one uses :
(a)     indicator   
(b)     digital indicator
(c)     recorder   
(d)     integrator
(e)     analog indicator.
Ans: c

9.    The condition of how much successive readings differ from one another for a fixed value of the variable is called :
(a)     accuracy   
(b)     error
(c)     sensitivity      
(d)     resolution
(e)     precision.
Ans: e

10.    The ratio of output signal or response of the instrument'" to a change in input or measured variable is called :
(a)     sensitivity
(b)     precision
(c)     resolution
(d)     threshold
(e)     accuracy.
Ans: a

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