Mechanical Engineering MCQs

2075 MCQs  (Page 35 of 208)

Attempt Mechanical Engineering Mcqs Quiz
Thermal conductivity of solid metals with rise in temperature normally___________________?
A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease depending on temperature
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Sensible heat is the heat required to __________________?
A. Change vapour into liquid
B. Change liquid into vapour
C. Increase the temperature of a liquid of vapour
D. Convert water into steam and superheat it
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Unit of thermal conductivity in S.I. units is__________________?
A. j/m2 sec
B. j/m °k sec
C. w/m °k
D. a. and c. above
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Heat transfer in liquid and gases takes place by_____________________?
A. Conduction
B. Convection
C. Radiation
D. Conduction and convection
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Heat flowing from one side to other depends directly on ___________________?
PicK up the wrong case?
D. None of these
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Which of the following is the case of heat transfer by radiation ___________________?
A. Blast furnace
B. Heating of building
C. Cooling of parts in furnace
D. Heat received by a person from fireplace
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Which of the following is a case of steady state heat transfer ___________________?
A. i.c. engine
B. air preheaters
C. heating of building in winter
D. all of the above
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Thermal conductivity of water in general with rise in temperature ____________________?
A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease depending on temperature
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Temperature of steam at around 540°C can be measured by ____________________?
A. Thermometer
B. Radiatiouv pyrometer
C. Thermistor
D. Thermocouple
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Metals are good conductors of heat because________________?
A. Their atoms collide frequently
B. Their atoms-are relatively far apart
C. They contain free electrons
D. They have high density
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Word of the Day
27 Sep
Undesirable
not wanted or desirable because harmful, objectionable, or unpleasant.
غیر مطلوب، ناروا، نامناسب

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