ISRO Mechanical Engg.: Thermodynamics Booster Quiz 1

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Question 1

Air at 100 kPa, 2 °C occupies a 10 liter piston-cylinder device that is arranged to maintain constant air pressure. This device is now heated until its volume is 20 liters. The work produced by the air is

• A20 kJ
• B10 kJ
• C2 kJ
• D1 kJ

Question 2

Characteristic gas constant of a gas is equal to

• AC_p / C_v
• BC_v /C_p
• CC_p - C_v
• DC_p + C_v

Question 3

The volume V versus temperature T graphs for a certain amount of a perfect gas at two pressure P₁ and P₂ are as shown in the figure. It can be concluded that

• AThe pressure P₁ is greater than the pressure P₂
• BThe adiabatic index for P₁ is higher than that for P₂
• CP₁ represents monoatomic gas and P₂ represents diatomic gas
• DNone of the above

Question 4

If a certain mass of moist air in an air tight vessel is heated to a higher temperature, then

• ASpecific humidity of the air increases
• BSpecific humidity of the air decreases
• CRelative humidity of the air increases
• DRelative humidity of the air decreases

Question 5

For traction applications, the type of motor best suited is

• AInduction motor
• BSynchronous motor
• CDC shunt motor
• DDC series motor

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