Top 550+ Solved Thermal Engineering 2 MCQ Questions Answer
Q. To refrain from separation in subsonic nozzles, the expansion angle must not be more than
a. 10 degrees
b. 20 degrees
c. 30 degrees
d. 40 degrees
Q. Gas flows through the nozzle from an area of pressure (called the chamber) to one of pressure
a. high, low
b. low, high
c. same, same
d. constant, infinite
Q. Converging-diverging nozzle is also known as
a. pascal nozzle
b. bernouille’s nozzle
c. toricelli’s nozzle
d. de laval’ nozzle
Q. When the pressure chamber is big, the flow velocities are
a. large
b. negligible
c. constant
d. increasing
Q. For a compressible, ideal gas, mass flow rate depends on parameters such as flow area, pressure, temperature, properties of the gas, and
a. avogardo’s number
b. mach number
c. reynold’s number
d. le-grange’ number
Q. Which type of boilers use orifice to control the flow circulation?
a. natural circulation boilers
b. forced convection boilers
c. once-through boilers
d. positive forced circulation boilers
Q. What is the advantage of having smaller ratio of water to steam space?
a. steam can be generated at a faster even if the boiler is cold
b. increases the rate of evaporation
c. water is made cyclic, i.e., from boiler drum to water tube and back to drum
d. helps in mobilizing the boiler
Q. Which are the major types of boilers that are operated in world today?
a. natural circulation boiler
b. forced circulation boiler
c. fire tube boiler
d. once through boiler
Q. How many level indicators are there in the water level indicator of a boiler?
a. 1
b. 2
c. 3
d. 4
Q. What is the function of pressure gauge in the boiler?
a. to indicate steam pressure
b. to indicate water pressure
c. to indicate air pressure
d. to indicate flue gas pressure
Q. other than Steam stop valve in the boiler which is the other similar type of valve used?
a. non-reversible valve
b. transient valve
c. reversible valve
d. junction valve
Q. What is the function of Blow down valve of a boiler?
a. to remove sludge
b. to build sediments
c. to remove flue gas
d. to remove ash
Q. Compression can be
a. dry compression
b. wet compression
c. both of the mentioned
d. none of the mentioned
Q. Why is wet compression not preferred?
a. the liquid refrigerant can be trapped in the head of cylinder
b. this may damage the valves or cylinder head
c. liquid refrigerant can wash away the lubricating oil thus accelerating wear
d. all of the mentioned