Mechanical Engineering Thermodynamics

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Q1. The fuel mostly used in blast furnace for extracting pig iron from iron ores is

(A) Hard coke
(B) Soft coke
(C) Pulverized coal
(D) Bituminous coal

Answer: (A) Hard coke

Q2. The work ratio of a gas turbine plant is given by

(A) (Net work output)/(Work-done by the turbine)
(B) (Net work output)/(Heat supplied)
(C) (Actual temperature drop)/(Isentropic temperature drop)
(D) (Isentropic increase in temperature)/(Actual increase in temperature)

Answer: (A) (Net work output)/(Work-done by the turbine)

Q3. Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

(A) It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
(B) It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
(C) It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
(D) None of the above

Answer:(B) It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.

Q4. Which of the following is a reversible non-flow process?

(A) Isochoric process
(B) Isobaric process
(C) Hyperbolic process
(D) All of these

Answer: (D) All of these

Q5. The atomic mass of nitrogen is __ oxygen.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

Answer: (B) Less than

Q6. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

(A) Isothermal process
(B) Hyperbolic process
(C) Adiabatic process
(D) Polytropic process

Answer: (A) Isothermal process

Q7. The value of 1 mm of Hg is equal to

(A) 1.333 N/m2
(B) 13.33 N/m2
(C) 133.3 N/m2
(D) 1333 N/m2

Answer: (C) 133.3 N/m2

Q8. The natural petroleum may be separated into

(A) Petrol
(B) Kerosene
(C) Fuel oil
(D) Lubricating oil

Answer: (D) Lubricating oil

Q9. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

(A) Isothermal process
(B) Adiabatic process
(C) Free expansion process
(D) Throttling process

Answer: (D) Throttling process

Q10. If the value of n = 0 in the equation pvn = C, then the process is called

(A) Constant volume process
(B) Adiabatic process
(C) Constant pressure process
(D) Isothermal process

Answer: (C) Constant pressure process

Q11. One molecule of oxygen consists of __ atoms of oxygen.

(A) 2
(B) 4
(C) 8
(D) 16

Answer: (A) 2

Q12. According to Kelvin-Planck’s statement, a perpetual motion of the __ is impossible.

(A) First kind
(B) Second kind
(C) Third kind
(D) None of these

Answer: (B) Second kind

Q13. The unit of energy is S. I. units is

(A) Joule (J)
(B) Joule meter (Jm)
(C) Watt (W)
(D) Joule/meter (J/m)

Answer: (A) Joule (J)

Q14. One kg of carbon produces __ kg of carbon dioxide.

(A) 3/7
(B) 7/3
(C) 11/3
(D) 3/11

Answer: (C) 11/3

Q15. The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)

(A) pv = mRT
(B) pv = RTm
(C) pvm = C
(D) pv = (RT)m

Answer: (A) pv = mRT

Q16. Carnot cycle consists of

(A) Two constant volume and two isentropic processes
(B) Two isothermal and two isentropic processes
(C) Two constant pressure and two isentropic processes
(D) One constant volume, one constant pressure and two isentropic processes

Answer: (B) Two isothermal and two isentropic processes

Q17. The variables which control the physical properties of a perfect gas are

(A) Pressure exerted by the gas
(B) Volume occupied by the gas
(C) Temperature of the gas
(D) All of these

Answer: (D) All of these

Q18. One molecule of oxygen is __ times heavier than the hydrogen atom.

(A) 12
(B) 14
(C) 16
(D) 32

Answer: (D) 32

Q19. Which of the following is the correct statement?

(A) All the reversible engines have the same efficiency.
(B) All the reversible and irreversible engines have the same efficiency.
(C) Irreversible engines have maximum efficiency.
(D) All engines are designed as reversible in order to obtain maximum efficiency.

Answer: (C) Irreversible engines have maximum efficiency.

Q20. A definite area or a space where some thermodynamic process takes place is known as

(A) Thermodynamic system
(B) Thermodynamic cycle
(C) Thermodynamic process
(D) Thermodynamic law

Answer: (A) Thermodynamic system

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