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Showing posts with label multiple choice questions on Process Instrumentation and Control - Mechanical Engineering. Show all posts
Showing posts with label multiple choice questions on Process Instrumentation and Control - Mechanical Engineering. Show all posts

Hiried Process Instrumentation and Control Objective type Questions and Answers pdf

61.    For an orfice plate having ratio of inside and pipe diameter as 0.5, the pressure loss in comparison to differential pressure created is of the order of :
(a)     5%
(b)     10%
(c)     20%
(d)     35%
(e)     50%.
Ans: e

62.    15° taper venturi tube causes loss of following % of the differential pressure :
(a)     5%
(b)     10%
(c)     20%
(d)     30%
(e)     40%.
Ans: b

63.    Pick out false statement about advantages of orifice plates, used for flow measurement :
(a)    no moving parts
(b)    long-term reliability
(c)    highturn-down ratio
(d)    inexpensive
(e)    inherently simple in operation.
Ans: c

64.    Pick out false statement about disadvantages of orifice plates :
(a)    square root relationship
(b)    poor turn-down ratio
(c)    critical installation requirements
(d)    short-term reliability
(e)    high irrecoverable pressure loss.
Ans: d

65.    Dall tube is another variation of :
(a)     orifice plate
(b)     nozzle
(c)     venturi tube
(d)     rotameter
(e)     pitot-tube.
Ans: c

66.    Target meter is concerned with measure-ment of:
(a)     flow
(b)     pressure
(c)     viscosity
(d)     density
(e)     level.
Ans: a

67.    The flow error in case of normal nozzles is of the order of :
(a)     0.1%
(b)     0.2%
(c)     0.5%
(d)     1%
(e)     2%.
Ans: d

68.    Which of the following flow meter maintains a constant pressure differential but varies the orifice area with flow :
(a)     Ledoux bell
(b)     variable area
(c)    straightening vane
(d)    variable head
(e)    vane-type.
Ans: b

69.    Flow in open channels is measured by using :
(a)     nozzle
(b)     orifice plate
(c)     propeller
(d)     weir
(e)     vortex-shedding meter.
Ans: d

70.    For measuring air flow, following meter is often used :
(a)    vane-type or anemometer
(b)    electro magnetic flow meter
(c)    vortex-shedding meter
(d)    ultrasonic flow meter
(e)    pitot tube.
Ans: a

Read More Questions:
Process Instrumentation and Control - Mechanical Engineering MCQs Part1
Process Instrumentation and Control - Mechanical Engineering MCQs Part2
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Latest Process Instrumentation and Control Multiple choice Questions and Answers pdf

41.    Cold junction compensation is needed in ase of measurement of temperature by :
(a)     thermocouple
(b)     thermopile
(c)     thermistor  
(d)     zener diode
(e)     resistance thermometer.
Ans: a

42.    Which of the following consists of a very thin strip of nickel or platinum foil which responds to temperature in the same manner as the resistance thermometer :
(a)     thermo pile
(b)     bolometer
(c)     radiation pyrometer
(d)    thermistor  
(e)     optical pyrometer.
Ans: b

43.    For measuring temperature in the range of 20 to 600°C, following liquid is used in glass thermometer :
(a)     mercury
(b)     alcohol
(c)     toluene
(d)     pentane
(e)     creosote.
Ans: a

44.    For measuring temperature in the range of 200 to 30°C, following liquid is used in glass thermometer:
(a)     mercury
(b)     alcohol
(c)     toluene
(d)     pentane
(e)     creosote.
Ans: d

45.    Which of the following glass is used for 00-600°C temperature measurement by mercury-in-glass thermometer :
(a)     lead glass   
(b)     normal grade
(c)     borosilicate
(d)     supermax
(e)     any one of the above.
Ans: d

46.    Pick up false statement about liquid-in-metal thermometers :
(a)    remote indication of temperature can't be given
(b)    error is produced if capillary passes through hot zone
(c)    error also occurs if instrument base is at high ambient temperature
(d)    error can also creep in by the head of the liquid if the bulb is installed either above or below the Bourdon
(e)    these are used for industrial applica-tions where accuracy is not so impor-tant.
Ans: a

47.    Twisting the thermocouple wires together and heat welding them :
(a)    is the standard practice of making junction
(b)    would result in noise generation
(c)    cause small errors due to local e.m.f. which may arise if the junction is too long
(d)    would slow down the response
(e)    result in inaccuracies.
Ans: c

48.    Which of the following thermocouple generates highest e.m.f. for a given temperature :
(a)    copper-constantan
(b)    iron-constantan
(c)    chromel-alumel
(d)    platinum-rhodium platinum
(e)    silver-palladium.
Ans: b

49.    Protective coating by a suitable cover are applied over strain gauge in order to protect it against:
(a)    temperature rise
(b)    dust and dirt
(c)    moisture
(d)     ageing
(e)     shorting by conductive contact.
Ans: c

50.    The resistance of strain gauge grid used in pressure transducers is of the order of :
(a)     0.1 to 1 ohm
(b)     1 to 10 ohm
(c)    10 to 100 ohm
(d)    100 to 2000 ohm
(e)    2000 to 105 ohm
Ans: d

Read More Questions:
Process Instrumentation and Control - Mechanical Engineering MCQs Part1
Process Instrumentation and Control - Mechanical Engineering MCQs Part2
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Process Instrumentation and Control Multiple choice Questions and Answers pdf

11.    The smallest change in measured value to which the instrument will respond is called
(a)     accuracy
(b)     precision
(c)     amplification
(d)     resolution
(e)     sensitivity.
Ans: d

12.    It responds directly to the measured quantity, producing a related motion or signal :
(a)    sensing element
(b)    transducer
(c)     transmitter
(d)     indicator
(e)     measuring device.
Ans: a

13.    Which of the following is used to count the number of brass items passing on a conveyor line, when no contact is permitted with the object:
(a)    event counter
(b)    mechanical counter
(c)    magnetic pick up
(d)    photoelectric cell
(e)    electronic counter.
Ans: d

14.    Which of the following does not pertain to timing device :
(a)    charging of a condenser
(b)    flow of oil through a dash pot
(c)    release of air through a nozzle
(d)    flow of sand through an opening
(e)    piezoelectric crystal.
Ans: e

15.    Motion of fast-moving systems may be timed and studied by means of a :
(a)     stroboscope
(b)     piezoelectric crystal
(c)    electronic timer
(d)    chronometer
(e)    photovoltaic cell.
Ans: a

16.    In which device the input motion changes the inductive coupling between primary and secondary coils :
(a)     potentiometer
(b)     synchro
(c)     collimator  
(d)     protractor
(e)     dial gauge.
Ans: b

17.    Which effect is useful in measuring rapidly varying forces :
(a)     piezoelectric
(b)     strain gauge
(c)     photovoltaic
(d)     pneumatic gauging
(e)     change of capacitance.
Ans: a

18.    Pressure measuring devices are not based on:
(a)    measure of an equivalent height of liquid column
(b)    measure of the force exerted on a fixed area
(c)    measure of some change in electrical or physical characteristics of the fluid
(d)    area measurement by polar planimeter
(e)    all of the above.
Ans: d

19.    Which of the following may be measured by the deflection of an elastic element, by balancing against a known force, by the acceleration produced in an object of known mass :
(a)     force
(b)     pressure
(c)     temperature
(d)     level
(e)     displacement.
Ans: a

20.    The sensitivity of reading of manometer can be increased by :
(a)    inclining the manometer rube
(b)    using low specific gravity fluid
(c)    application of optical magnification
(d)    use of level sensing device
(e)    all of the above.
Ans: a

Read More Questions:
Process Instrumentation and Control - Mechanical Engineering MCQs Part1
Process Instrumentation and Control - Mechanical Engineering MCQs Part2
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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

Read More Questions:
Process Instrumentation and Control - Mechanical Engineering MCQs Part1
Process Instrumentation and Control - Mechanical Engineering MCQs Part2
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