Engineering Thermodynamics solved MCQs

1 of 21

1. A definite area or space where some thermodynamic process takes place is known as

a. a) thermodynamic system

B. b) thermodynamic cycle

c. c) thermodynamic process

d. d) thermodynamic law

2. An open system is one in which

a. heat & work cross the boundary of the system, but the mass of the working substance does not

B. mass of working substance crosses the boundary of the system but the heat & work do not

c. both the heat & work as well as mass of the working substance cross the boundary of the system

d. neither the heat & work nor the mass of the working substances cross the boundary of the system

3. An isolated system

a. a) is a specified region where transfer of energy and/or mass take place

B. b) is a region of constant mass & only energy is allowed to cross the boundaries

c. c) cannot transfer either energy or mass to or from the surroundings

d. d) is one in which mass within the system is not necessarily constant

4. Which of the following is an intensive property of a thermodynamic system

a. a) volume

B. b) temperature

c. c) mass

d. d) energy

5. Which of the following is the extensive property of a thermodynamic system

a. a) pressure

B. b) volume

c. c) temperature

d. d) density

6. When two bodies are in thermal equilibrium with a third body they are also in thermal equilibrium with eachother. This statement is called

a. a) zeroth law of thermodynamics

B. b) first law of thermodynamics

c. c) second law of thermodynamics

d. d) kelvin planck\s law

7. The temperature at which the volume of a gas becomes zero is called

a. a) absolute scale of temperature

B. b) absolute zero temperature

c. c) absolute temperature

d. d) none of the above

8. The value of one bar (in SI units) is equalto

a. a) 100 n/m??

B. b) 1000 n/m??

c. c) 1??10⁴ n/m??

d. d) 1??10⁵ n/m??

9. The absolute zero pressure will be

a. a) when molecular momentum of the systembecomes zero

B. b) at sea level

c. c) at the temperature of -273 k

d. d) under vaccum conditions

10. Absolute zero temperature is taken as

a. a) -273??c

B. b) 273??c

c. c) 237??c

d. d) -373??c

11. Which of the following is correct?

a. a) absolute pressure= guage pressure+ atmosphericpressure

B. b) guage pressure= absolute pressure + atmosphericpressure

c. c) atmospheric pressure= absolute pressure+ guagepressure

d. d) absolute pressure= guage pressure-atmospheric pressure

12. The unit of energy in SI units is

a. a) joule (j)

B. b) joule metre (jm)

c. c) watt (w)

d. d) joule/metre (j/m)

13. One watt is equal to

a. a) 1 nm/s

B. b) 1n/min

c. c) 10 n/s

d. d) 100 nm/s

14. One joule (J) is equal to

a. a) 1 nm

B. b) knm

c. c) 10 nm/s

d. d) 10 knm/s

15. A series of operations, which take place in a certain order & restore the initialcondition is known as

a. a) reversible cycle

B. b) irreversible cycle

c. c) thermodynamic cycle

d. d) none of the above

16. The condition for the reversibility of a cycle is

a. a) the pressure & temperature of the working substance must not differ, appreciably, from those of

B. a) all the processes, taking place in the cycle of operation, must be extremely slow

c. c) the working parts of the engine must be friction free

d. d) all of the above

17. According to kinetic theory of heat

a. a) temperature should rise during boiling

B. b) temperature should fall during freezing

c. c) at low temperature all bodies are in solid state

d. d) at absolute zero there is absolutely no vibration ofmolecules

18. A system comprising a single phase iscalled a

a. a) closed system

B. b) open system

c. c) isolated system

d. d) homogeneous system

19. If all the variables of a stream areindependent of time it is said to be in

a. a) steady flow

B. b) unsteady flow

c. c) uniform flow

d. d) closed flow

20. A control volume refers to

a. a) a fixed region in space

B. b) a specified mass

c. c) an isolated system

d. d) a reversible process only

21. Internal energy of a perfect gas dependson

a. a) temperature, specificheats & pressure

B. b) temperature, specificheats & enthalpy

c. c) temperature, specific heats& entropy

d. d) temperature only

22. Steady flow process requires that

a. a) conditions do not change with time at any point

B. b) conditions are the same at adjacent points at anyinstant

c. c) conditions change steadily with the time

d. d) is constant

23. The first law of thermodynamics for steady flow

a. a) accounts for all energy entering & leaving a controlvolume

B. b) is an energy balance for a specified mass of fluid

c. c) is an expression of the conservation of linearmomentum

d. d) is primarily concerned with heat transfer

24. Which of the following is not a propertyof the system

a. a) temperature

B. b) pressure

c. c) specific volume

d. d) heat

25. The process or systems that do not involve heat are called

a. a) isothermal processes

B. b) equilibrium processes

c. c) adiabatic processes

d. d) steady processes

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