Question 81 : When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
1. convergent-divergent nozzle
2. divergent nozzle
3. convergent nozzle
4. none of the mentioned
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Question 82 : Convergent part of the nozzle is usually sharp while the divergent one is?
1. slopy
2. gradual
3. both the above mentioned
4. none of the mentioned
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Question 83 : Curtis turbine is a
1. pressure compounded turbine
2. velocity compounded turbine
3. simple reaction turbine
4. pressure-velocity compounded turbine
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Question 84 : A nozzle is said to be a divergent nozzle
1. when the cross-section of the nozzle increases continuously from entrance to exit
2. when the cross-section of the nozzle decreases continuously from entrance to exit
3. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
4. none of the mentioned
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Question 85 : The pressure drop in reaction turbines occurs in?
1. fixed blades
2. movable blades
3. both in nozzles & fixed blades
4. in nozzles
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Question 86 : The diagram efficiency is the ratio of
1. work done on the blades to the energy supplied to the blades
2. energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
3. work done on the blades per kg of steam to the total energy supplied per stage per kg of steam
4. none of the mentioned
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Question 87 : The nozzle formed by curved airfoil sections is called?
1. Curved nozzle
2. Airfoil Nozzle
3. Foil nozzle
4. Reamed nozzle
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Question 88 : The value of the reheat factor varies from
1. 1.08 to 1.10
2. 1.2 to 1.6
3. 1.6 to 2
4. 1.02 to 1.06
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Question 89 : Which of the following statement is correct?
1. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
2. The efficiency of steam turbine is greater than the steam engines
3. A flywheel is a must for steam turbine.
4. The turbine blades do not change the direction of steam issuing from the nozzle
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Question 90 : The critical pressure ratio for initially dry saturated steam is
1. 0.546
2. 0.577
3. 0.586
4. 0.578
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