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
(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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