Question 31 : The ratio of the useful heat drop to the isentropic heat drop is called
1. condenser efficiency
2. vacuum efficiency
3. nozzle efficiency
4. boiler efficiency
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Question 32 : Parson's turbine is a
1. simple impulse turbine
2. simple reaction turbine
3. impulse-reaction turbine
4. none of these
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Question 33 : The value of the reheat factor varies from
1. 1.2 to 1.6
2. 1.02 to 1.06
3. 1.08 to 1.l0
4. 1.6 to 2
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Question 34 : Steam turbines are used for
1. electric power generation
2. all of these
3. large marine propulsion
4. direct drive of fans, compressors, pumps
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Question 35 : The variation of steam pressure in the nozzle depends upon
1. velocity of steam
2. dryness fraction of steam
3. specific volume of steam
4. all of these
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Question 36 : A binary vapour plant consists of
1. all of these
2. steam condenser
3. steam turbine
4. mercury boiler
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Question 37 : Parson's reaction turbine is a __________ reaction turbine.
1. 50 percent
2. 70 percent
3. 60 percent
4. 40 percent
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Question 38 : In reaction turbines, the axial thrust is due to
1. both (a) and (b)
2. pressure drop across the rotor
3. none of these
4. change in axial velocity
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Question 39 : The nozzle efficiency is the ratio of
1. none of the above
2. workdone on the blades to the energy supplied to the blades
3. workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
4. energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
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Question 40 : In order to reduce the rotor speed of an impulse turbine, the method employed is
1. pressure compounding
2. all of these
3. velocity compounding
4. pressure-velocity compounding
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