Thermodynamics MCQs

Mechanical Engineering Objective Questions

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113. An adiabatic wall is one which

A. Prevents thermal interaction

B. Permits thermal interaction

C. Encourages thermal interaction

D. Discourages thermal interaction

114. Compressed air coming out from a punctured football

A. Becomes hotter

B. Becomes cooler

C. Remains at the same temperature

D. May become hotter or cooler depending upon the humidity of the surrounding air

115. During throttling process

A. Heat exchange does not take place

B. No work is done by expanding steam

C. There is no change of internal energy of steam

D. All of the above

116. Water contained in a beaker can be made to boil by passing steam through it

A. At atmospheric pressure

B. At a pressure below the atmospheric pressure

C. At a pressure greater than atmospheric pressure

D. Any pressure

117. The energy of molecular motion appears as

B. Potential energy

C. Surface tension

118. The unit of universal gas constant is

119. A sudden fall in the barometer reading is a sign of approaching

A. Fine weather

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