Power Plant Questions and Answers – Turbine Efficiency and Flow Through Nozzles – II

This set of Power Plant Questions and Answers for Campus interviews focuses on “Turbine Efficiency and Flow Through Nozzles – II”.

1. 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
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2. The difference in supersaturated temperature and saturation temperature at that pressure is called ____________
a) degree of super saturation
b) degree of superheat
c) degree of undercooling
d) none of the mentioned
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3. Parson’s turbine is a ____________
a) simple impulse turbine
b) impulse-reaction turbine
c) simple reaction turbine
d) none of the mentioned
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4. 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
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5. 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
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6. 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
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7. A binary vapour plant consists of ____________
a) mercury boiler
b) steam turbine
c) steam condenser
d) all of the mentioned
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8. 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
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9. 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
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10. The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the ____________
a) blades are equiangular
b) blade velocity coefficient is unity
c) blade solidity is 0.65
d) blades are equiangular and frictionless
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11. 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
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12. Curtis turbine is a ____________
a) pressure compounded turbine
b) velocity compounded turbine
c) simple reaction turbine
d) pressure-velocity compounded turbine
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13. 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
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14. Parson’s reaction turbine is a __________ reaction turbine.
a) 40%
b) 50%
c) 60%
d) 70%
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15. The diagram efficiency is the ratio of ____________
a) work done on the blades to the energy supplied to the blades
b) energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
c) work done on the blades per kg of steam to the total energy supplied per stage per kg of steam
d) none of the mentioned
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