Top 150+ Solved Thermal Engineering 1 MCQ Questions Answer
Q. The balanced draft furnace is one using
a. induced draft fan and chimney
b. induced draft fan and forced draft fan
c. forced draft fan and chimney
d. any one of the above
Q. Fire tube boilers are limited to a maximum design working pressure of
a. 1 kg/cm
b. 6 kg/cm
c. 17 kg/cm2
d. 100 kg/cm2
Q. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has
a. more heating surface
b. less heating surface
c. equal heating surface
d. heating surface depends on other parameters
Q. The feed check valve is used in order to
a. regulate flow of boiler water
b. check level of water in boiler drum
c. recirculate unwanted feed water
d. allow high pressure feed water to flow to drum and not allow reverse flow to take place
Q. Equivalent evaporation is the amount of water evaporated in a boiler from and at
a. 0°C
b. 100°C
c. saturation temperature at given pressure
d. room temperature
Q. The equivalent evaporation of a boiler is a measure to compare
a. the given boiler with the model
b. the two different boilers of the same make
c. two different makes of boilers operat¬ing under the same operating conditions
d. any type of boilers operating under any conditions.
Q. Steam nozzle converts
a. heat energy of steam into pressure energy
b. heat energy of steam into kinetic energy
c. pressure energy of steam into heat energy
d. pressure energy of steam into potential energy
Q. A nozzle is designed for
a. maximum pressure at the outlet
b. maximum discharge
c. maximum pressure and maximum discharge
d. maximum kinetic energy at the outlet
Q. Ideal expansion of steam through a nozzle is considered
a. isothermal
b. adiabatic
c. polytropic
d. none of the above
Q. Presence of frictional effect during flow through the nozzle
a. reduces the exit velocity
b. increases the exit velocity
c. has no effect on exit velocity
d. none of the above
Q. Frictional losses in the nozzle
a. reduces the heat drop
b. increases the heat drop
c. has no effect on heat drop
d. none of the above
Q. While steam expands in turbines, theoretically the entropy
a. remains constant
b. increases
c. decreases
d. behaves unpredictably
Q. Nozzle efficiency is defined as
a. ratio of isentropic heat drop to useful heat drop
b. ratio of useful heat drop to isentropic heat drop
c. product of useful heat drop and isentropic heat drop
d. none of the above
Q. When a nozzle operates with maximum mass flow, it is said to be
a. under expanding flow
b. over expanding flow
c. choked flow
d. none of the above
Q. For supersaturated flow in the nozzle, the discharge
a. increases
b. decreases
c. remains constant
d. none of the above