Top 150+ Solved Thermal Engineering 1 MCQ Questions Answer
Q. For water, at pressures below atmospheric,
a. melting point rises slightly and boiling point drops markedly
b. melting point rises markedly and boiling point drops markedly
c. melting point drops slightly and boiling point drops markedly
d. melting point drops slightly and boiling point drops slightly
Q. At very low temperature, the melting and boiling temperatures become equal. This temperature is
a. 373°K
b. 273.16°K
c. 303°K
d. 0°K.
Q. The critical pressure at which latent heat of vaporisation is zero is
a. 225.65 kgf/cm2
b. 273 kgf/cm2
c. 100 kgf/cm2
d. 1 kgf/cm2
Q. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
a. less
b. more
c. equal
d. may be less or more depending on temperature
Q. The saturation temperature of steam with increase in pressure increases
a. linearly
b. rapidly first and then slowly
c. slowly first and then rapidly
d. inversely
Q. Heating of dry steam above saturation temperature is known as
a. enthalpy
b. superheating
c. supersaturation
d. latent heat
Q. Superheating of steam is done at
a. constant volume
b. constant temperature
c. constant pressure
d. constant entropy
Q. Sublimation region is the region where
a. solid and vapour phases are in equi-librium
b. solid and liquid phases are in equilibrium
c. liquid and vapour phases are in equilibrium
d. solid, liquid and vapour phases are in equilibrium
Q. One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is
a. 0.2
b. 0.8
c. 1.0
d. 0.6
Q. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
a. throttling calorimeter
b. separating calorimeter
c. combined separating and throttling calorimeter
d. bucket calorimeter
Q. On Mollier chart, flow through turbine is represented by
a. horizontal straight line
b. vertical straight line
c. straight inclined line
d. curved line
Q. A wet vapour can be completely specified by
a. pressure only
b. temperature only
c. dryness fraction only
d. pressure and dryness fraction.
Q. On Millier chart, the constant pressure lines
a. diverge from left to right
b. diverge from right to left
c. are equally spaced throughout
d. first rise up and then fall
Q. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by
a. horizontal straight line
b. vertical straight line
c. straight inclined line
d. curved line
Q. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become
a. wet
b. superheated
c. remain dry satruated
d. dry