1. In a P-V diagram for pure substance, the constant temperature line in superheated region is ________ ?

converging

diverging

intersecting

parallel

Answer: diverging

Explanation:


2. The entropy change of the system and the surroundings during a process between two equilibrium states is ________ ?

equal to zero

greater than zero

less than zero

greater than or equal to zero

Answer: greater than or equal to zero

Explanation:


3. Which equation best represents the net entropy change (s) for an irreversible process ?

s = 0

s = 1

s < 0

s > 0

Answer: s > 0

Explanation:


4. Which of the engine has a spark plug used for igniting the fuel ?

Petrol engine

Diesel engine

Steam engine

Gas engine

Answer: Petrol engine

Explanation:


5. In a P-T diagram for pure substance, the melting line has highest inclination with respect to the positive horizontal axis representing temperature for which type of substance ?

Substance that contracts on freezing

Substance that expands on freezing

Substance that has same volume on freezing

None of these

Answer: Substance that expands on freezing

Explanation:


6. The work done by a system is 45 kJ. If the internal energy of the system is decreased by 15 kJ. What is the heat received (in kJ) by the system ?

-60

-30

30

60

Answer: 30

Explanation:


7. A reversible adiabatic in a T-S diagram is a ________ ?

point

vertical line

horizontal line

parabolic curve

Answer: vertical line

Explanation:


8. Specific enthalpy is an ________ of a system and its unit is ________ ?

extensive property, kJ

extensive property, kJ/kg

intensive property, kJ

intensive property, kJ/kg

Answer: intensive property, kJ/kg

Explanation:


9. The internal energy of the system is a function of temperature only U=30+0.5t kJ. If the system does the work of 0.5 kJ/K. What is the increase in heat interaction per degree temperature ?

-1

0

1

Cannot be determined

Answer: 1

Explanation:


10. 2500 kJ/min heat is supplied to a heat engine at 7270C. It rejects heat at 900 kJ/min at 2230C. This type of engine is ________ ?

ideal

irreversible

impossible

practical

Answer: impossible

Explanation: