Thermodynamics problems
- 1. The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
Options- A. 0
- B. 1
- C. ?
- D. ? Discuss
Correct Answer: 1
- 2. For the same compression ratio, the efficiency of dual combustion cycle is
Options- 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 Discuss
Correct Answer: greater than Diesel cycle and less than Otto cycle
- 3. The gas turbine cycle with regenerator improves
Options- A. thermal efficiency
- B. work ratio
- C. avoids pollution
- D. none of these Discuss
Correct Answer: thermal efficiency
- 4. Which of the following is an intensive property of a thermodynamic system?
Options- A. Volume
- B. Temperature
- C. Mass
- D. Energy Discuss
Correct Answer: Temperature
- 5. The conditions of temperature and pressure at 0°C (273K) and 760 mm of Hg pressure are termed as __________ temperature and pressure.
Options- A. normal
- B. standard Discuss
Correct Answer: standard
- 6. Coke is produced
Options- A. when coal is first dried and then crushed to a fine powder by pulverising machine
- B. from the finely ground coal by moulding under pressure with or without a binding material
- C. when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
- D. by heating wood with a limited supply of air to a temperature not less than 280°C Discuss
Correct Answer: when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
- 7. The heating of a gas at constant pressure is governed by Charles' law.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. When a gas is heated, change takes place in
Options- A. pressure
- B. volume
- C. temperature
- D. all of these Discuss
Correct Answer: all of these
- 9. Carnot cycle consists of
Options- 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 Discuss
Correct Answer: two isothermal and two isentropic processes
- 10. The molecular mass expresssed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
Options- A. 0.224 litres
- B. 2.24 litres
- C. 22.4 litres
- D. 224 litres Discuss
Correct Answer: 22.4 litres
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