# Engineering Thermodynamics mcq Questions And Answers – Set 17

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## Q1. An isothermal process is governed by

(A) Boyle’s law
(B) Charles’ law
(C) Gay-Lussac law

## Q2. The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

(A) Specific heat at constant volume
(B) Specific heat at constant pressure
(C) kilo-Joule
(D) None of these

## Q3. The __ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

(A) Boyle’s law
(B) Charle’s law
(C) Gay-Lussac law
(D) Joule’s law

## Q4. Which of the following is the correct statement?

(A) For a given compression ratio, both Otto and Diesel cycles have the same efficiency
(B) For a given compression ratio, Otto cycle is more efficient than Diesel cycle
(C) For a given compression ratio, Diesel cycle is more efficient than Otto cycle
(D) The efficiency of Otto or Diesel cycle has nothing to do with compression ratio

## Q5. The volumetric or molar specific heat at constant pressure is the product of

(A) Molecular mass of the gas and the specific heat at constant volume
(B) Atomic mass of the gas and the gas constant
(C) Molecular mass of the gas and the gas constant
(D) None of the above

## Q6. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

(A) Law of equipartition of energy
(B) Law of conservation of energy
(C) Law of degradation of energy
(D) None of these

(A) -140 kJ
(B) -80 kJ
(C) -40 kJ
(D) +60 kJ

(A) 1 g
(B) 10 g
(C) 100 g
(D) 1000 g

## Q9. One kg of hydrogen requires 8 kg of oxygen and produces

(A) 1 kg of water
(B) 7 kg of water
(C) 8 kg of water
(D) 9 kg of water

## Q10. In open cycle gas turbine plants

(A) The indirect heat exchanger and cooler is avoided
(B) Direct combustion system is used
(C) A condenser is used
(D) All of the above

(A) 30 kJ
(B) 54 kJ
(C) 84 kJ
(D) 114 kJ

## Q12. 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

## Q13. 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)

## Q14. 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

## Q15. Kerosene is distilled at

(A) 65° to 220°C
(B) 220° to 345°C
(C) 345° to 470°C
(D) 470° to 550°C

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