Engineering Thermodynamics Questions And Answers - Set 19 - ObjectiveBooks
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# Practice Test: Question Set - 19

1. Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) Kinetic theory of gases

2. When the gas is heated at constant pressure, the heat supplied
(A) Increases the internal energy of the gas
(B) Increases the temperature of the gas
(C) Does some external work during expansion
(D) Both (B) and (C)

3. When a gas is heated at constant volume
(A) Its temperature will increase
(B) Its pressure will increase
(C) Both temperature and pressure will increase
(D) Neither temperature nor pressure will increase

4. 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

5. 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

6. 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

7. One molecule of oxygen is __________ times heavier than the hydrogen atom.
(A) 12
(B) 14
(C) 16
(D) 32

8. The absolute zero temperature is taken as
(A) -273°C
(B) 73°C
(C) 237°C
(D) -237°C

9. The efficiency and work ratio of a simple gas turbine cycle are
(A) Low
(B) Very low
(C) High
(D) Very high

10. The specific heat of water is
(A) 1.817
(B) 2512
(C) 4.187
(D) None of these

11. The specific heat at constant volume is
(A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
(C) The amount of heat required to raise the temperature of 1 kg of water through one degree
(D) Any one of the above

12. For the same compression ratio, the efficiency of dual combustion cycle is
(A) Greater than Diesel cycle and less than Otto cycle
(B) Less than Diesel cycle and greater than Otto cycle
(C) Greater than Diesel cycle
(D) Less than Diesel cycle

13. The main cause for the irreversibility is
(A) Mechanical and fluid friction
(B) Unrestricted expansion
(C) Heat transfer with a finite temperature difference
(D) All of the above

14. The mass of flue gas per kg of fuel is the ratio of the
(A) Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
(B) Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
(C) Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
(D) Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas

15. The heating of a gas at constant pressure is governed by
(A) Boyle's law
(B) Charles' law
(C) Gay-Lussac law