Top 250+ Solved Engineering Thermodynamics MCQ Questions Answer
Q. According to kinetic theory of heat
a. a) temperature should rise during boiling
b. b) temperature should fall during freezing
c. c) at low temperature all bodies are in solid state
d. d) at absolute zero there is absolutely no vibration ofmolecules
Q. A system comprising a single phase iscalled a
a. a) closed system
b. b) open system
c. c) isolated system
d. d) homogeneous system
Q. If all the variables of a stream areindependent of time it is said to be in
a. a) steady flow
b. b) unsteady flow
c. c) uniform flow
d. d) closed flow
Q. A control volume refers to
a. a) a fixed region in space
b. b) a specified mass
c. c) an isolated system
d. d) a reversible process only
Q. Internal energy of a perfect gas dependson
a. a) temperature, specificheats & pressure
b. b) temperature, specificheats & enthalpy
c. c) temperature, specific heats& entropy
d. d) temperature only
Q. Steady flow process requires that
a. a) conditions do not change with time at any point
b. b) conditions are the same at adjacent points at anyinstant
c. c) conditions change steadily with the time
d. d) is constant
Q. The first law of thermodynamics for steady flow
a. a) accounts for all energy entering & leaving a controlvolume
b. b) is an energy balance for a specified mass of fluid
c. c) is an expression of the conservation of linearmomentum
d. d) is primarily concerned with heat transfer
Q. Which of the following is not a propertyof the system
a. a) temperature
b. b) pressure
c. c) specific volume
d. d) heat
Q. The process or systems that do not involve heat are called
a. a) isothermal processes
b. b) equilibrium processes
c. c) adiabatic processes
d. d) steady processes
Q. ……… is the ratio of actual cycle efficiency to that of the ideal cycle efficiency
a. a) efficiency ratio
b. b) work ratio
c. c) effectiveness
d. d) none of the above
Q. The gas laws can be usedwith minimum error is case of
a. a) wet steam
b. b) dry steam
c. c) saturated steam
d. d) superheated steam
Q. Mathematically a puresubstance can be written as
a. a) p=f(t,v)
b. b) v= f(p,t)
c. c) t=f(p,v)
d. d) any of the above
Q. A Carnot cycle operates between source & sink temperatures of 250°C & - 15°C. If the system receives 90kJ from the source then the net worktransfer equals
a. a) 30.5 kj
b. b) 35.65 kj
c. c) 45.54 kj
d. d) 65.54 kj
Q. Consider the following statements regarding superheating in Rankine Cycles1. It reduces the specific steam consumption2. It increases the dryness fraction of steam at the exhaust for the same value of condenser pressure3. It reduces the cycle efficiency Of the these statements
a. 1 & 2 are correct
b. 2 & 3 are correct
c. 1 & 3 are correct
d. 1, 2 & 3 are correct
Q. Energy is a
a. point function
b. property of the system
c. extensive property
d. all of the mentioned