Question 21 : Curtis turbine is a
1. pressure compounded turbine
2. pressure-velocity compounded turbine
3. velocity compounded turbine
4. simple reaction turbine
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Question 22 : The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 ?, where ? is the nozzle exit flow angle, if the
1. blade velocity coefficient is unity
2. blades are equiangular and frictionless
3. blades are equiangular
4. blade solidity is 0.65
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Question 23 : When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
1. divergent nozzle
2. convergent nozzle
3. convergent-divergent nozzle
4. none of these
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Question 24 : De-Laval turbine is a
1. simple impulse turbine
2. none of these
3. simple reaction turbine
4. impulse-reaction turbine
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Question 25 : The flow of steam is super-sonic
1. at the entrance to the nozzle
2. in the divergent portion of the nozzle
3. at the throat of the nozzle
4. in the convergent portion of the nozzle
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Question 26 : A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be
1. 79 m/s
2. 450 m/s
3. 900 m/s
4. 188 m/s
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Question 27 : The steam enters the nozzle at a
1. low pressure and a low velocity
2. high pressure and a high velocity
3. high pressure and a low velocity
4. low pressure and a high velocity
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Question 28 : The difference of supersaturated temperature and saturation temperature at that pressure is called
1. degree of undercooling
2. degree of supersaturation
3. degree of superheat
4. none of these
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Question 29 : In a reaction turbine, when steam flows through the fixed blades,
1. pressure and velocity both decreases
2. pressure increases while velocity decreases
3. pressure and velocity both increases
4. pressure decreases while velocity increases
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Question 30 : The efficiency of steam turbines may be improved by
1. regenerative feed heating
2. any one of these
3. reheating of steam
4. binary vapour plant
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