Top 350+ Solved Thermodynamics MCQ Questions Answer
Q. Which of the following is a boiler accessory?
a. Water level indicator
b. Economiser
c. Pulsejet
d. Stop valve
e. Fusible plug
Q. Draught ensures supply of
a. Air for combustion
b. Feed water
c. Coad to the boiler
d. Superheated steam
e. Isothermal
Q. 287 J/kg/?k is the value of
a. Gas constant in MKS units
b. Gas constant in S.I. units
c. Universal gas constant in MKS units
d. Universal gas constant in S.I. units
e. None of the above
Q. The velocity potential exists
a. Only for unidirectional flow
b. Only for rotational flow
c. For all types of continuous flow
d. Only for laminar flow
e. Only for irrotational flow
Q. Which of the following statement is correct?
a. Both heat and work are path functions
b. Pulsejet
c. Systems never possess heat but work can be
d. While work is a boundary phenomenon heat is not
e. Both heat and work are inexact differentials
Q. Identify the correct statement
a. All substances emit radiation the quality and quantity depends on the absolute temperature and properties of the material composing the radiating body
b. Only some substances emit radiation
c. Quality and quantity of radiation depends on the properties of the material only
d. A substance will emit radiation at a particular wavelength only
e. Bodies black in colour are known as black bodies in radiation
Q. Which of the following changes during throttling process?
a. Pressure
b. Temperature
c. Internal energy
d. Pressure x Volume
e. All of the above
Q. "The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature".
a. Boyle's law
b. Regnault's law
c. Avogadro's hypothesis
d. Balton's law
e. Gay Lussac's law
Q. In which case the heat transferred from the air when compressed from 1.05 ata 15?C to 6.3 ata would be minimum?
a. Adiabatic
b. Polytropic pv1.3 = C
c. Polytropic pv1.31 = C
d. Polytropic pv1.35 = C
e. Isothermal
Q. The specific heat of water
a. Decreases with rise of temperature
b. First increases, reaches a maximum value and then decreases.
c. Increases with rise of temperature
d. First decreases, reaches a minimum value and then increases
e. Does not change with temperature
Q. If during a process the entropy of a isolated system increases, the process is
a. Ideal
b. Reversible
c. Irreversible
d. Polytropic
e. None of the above
Q. Ericsson cycle processes are
a. Two adiabatic, constant volume and constant pressure
b. Two isothermals and two constant pressures
c. Two isothermals and two isentropics
d. Two isothermals and two constant volumes
e. Two isothermals and two isentropics
Q. In a Joule cycle, the heat is rejected at
a. Constant pressure
b. Constant enthalpy
c. Constant temperature
d. Constant volume
e. Constant entropy