Question 61 : Stage efficiency is also known as
1. nozzle efficiency
2. gross efficiency
3. diagram efficiency
4. none of these
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Question 62 : A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
1. low pressure turbine
2. impulse turbine
3. back pressure turbine
4. pass out turbine
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Question 63 : In a reaction turbine, when steam flows through the moving blades,
1. pressure and velocity both increases
2. pressure decreases while velocity increases
3. pressure increases while velocity decreases
4. pressure and velocity both decreases
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Question 64 : In an ideal impulse turbine, the
1. relative velocity at the inlet of the moving blade is equal to that at the outlet
2. absolute velocity at the inlet of moving blade is equal to that at the outlet
3. axial velocity at inlet is equal to that at the outlet
4. whirl velocity at inlet is equalto that at the outlet
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Question 65 : In a nozzle, the effect of supersaturation is to
1. decrease specific volume of steam
2. decrease dryness fraction of steam
3. increase the entropy
4. increase the heat drop
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Question 66 : Which of the following statement is correct?
1. The turbine blades do not change the direction of steam issuing from the nozzle
2. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
3. A flywheel is a must for steam turbine.
4. The efficiency of steam turbines is greater than steam engines.
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Question 67 : If the critical pressure ratio for steam is 0.546, then the steam is initially
1. dry saturated steam
2. wet steam
3. none of these
4. superheated steam
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Question 68 : Which of the following statement is wrong?
1. The flowin the convergent portion of the nozzle is sub-sonic.
2. The flow in the divergent portion of the nozzle is super-sonic.
3. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
4. To increase the velocity of steam above sonic velocity (super-sonic) by expanding steam below the critical pressure, the divergent portion for the noz
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Question 69 : In an impulse turbine, steam expands
1. wholly in blades
2. none of these
3. wholly in nozzle
4. partly in the nozzle and partly in blades
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Question 70 : Steam turbines may be classified according to
1. mode of steam action
2. all of these
3. direction of steam flow
4. number of stages
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