Top 550+ Solved Thermal Engineering 2 MCQ Questions Answer
Q. The Parsons’ reaction turbine has ____________
a. only moving blades
b. only fixed blades
c. fixed and moving blades of different shape
d. identical fixed and moving blades
Q. The ratio of the useful heat drop to the isentropic heat drop is called ____________
a. condenser efficiency
b. nozzle efficiency
c. vacuum efficiency
d. boiler efficiency
Q. Rateau turbine is ____________
a. pressure-velocity compounded turbine
b. simple reaction turbine
c. velocity compounded turbine
d. pressure compounded turbine
Q. The value of the reheat factor varies from ____________
a. 1.08 to 1.10
b. 1.2 to 1.6
c. 1.6 to 2
d. 1.02 to 1.06
Q. In reaction turbines, the axial thrust is due to ____________
a. pressure drop across the rotor
b. change in axial velocity
c. both pressure drop across the rotor and change in axial velocity
d. none of the mentioned
Q. The flow of steam is super-sonic ____________
a. in the convergent portion of the nozzle
b. at the entrance to the nozzle
c. at the throat of the nozzle
d. in the divergent portion of the nozzle
Q. The variation of steam pressure in the nozzle depends upon ____________
a. dryness fraction of steam
b. specific volume of steam
c. velocity of steam
d. all of the mentioned
Q. A binary vapour plant consists of ____________
a. mercury boiler
b. steam turbine
c. steam condenser
d. all of the mentioned
Q. The steam enters the nozzle at a ____________
a. low pressure and a low velocity
b. high pressure and a low velocity
c. low pressure and a high velocity
d. high pressure and a high velocity
Q. In a reaction turbine, when steam flows through the fixed blades ____________
a. pressure decreases while velocity increases
b. pressure increases while velocity decreases
c. pressure and velocity both increases
d. pressure and velocity both decreases
Q. Steam turbines are used for ____________
a. electric power generation
b. large marine propulsion
c. direct drive of fans, compressors, pumps
d. all of the mentioned
Q. Curtis turbine is a ____________
a. pressure compounded turbine
b. velocity compounded turbine
c. simple reaction turbine
d. pressure-velocity compounded turbine
Q. Which of the following statement is correct?
a. the expansion of steam in a nozzle follows rankine cycle
b. the friction in the nozzle increases the dryness fraction of steam
c. the pressure of steam at throat is called critical pressure
d. all of the mentioned
Q. What is the purpose of governing in steam turbines?
a. reheat the steam and improve its quality
b. maintain the speed of the turbine
c. reduce the effective heat drop
d. completely balance against end thrust
Q. The ratio of the isentropic heat drop to the heat supplied is called ____________
a. stage efficiency
b. reheat factor
c. internal efficiency
d. rankine efficiency