Question 71 : Parson's turbine is a
1. simple impulse turbine
2. impulse-reaction turbine
3. simple reaction turbine
4. none of the mentioned
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Question 72 : In an impulse turbine, steam expands
1. wholly in nozzle
2. partly in the nozzle and partly in blades
3. wholly in blades
4. none of the mentioned
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Question 73 : Depending on whether the back pressure is below or equal to the atmospheric pressure, how many types of turbines do exist?
1. 1
2. 2
3. 3
4. 4
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Question 74 : What is use of the air pumps in the condenser?
1. Remove water
2. Air leaking in the condenser and to maintain the vacuum.
3. Maintain atmospheric pressure and the condenser.
4. Both (a) & (b)
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Question 75 : The ratio of actual mass flow through the nozzle to the mass flow if the flow were isentropic is?
1. Coefficient of viscosity
2. Coefficient of velocity
3. Coefficient of discharge
4. None of the mentioned
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Question 76 : The reheat factor depends upon
1. exit pressure
2. turbine stage efficiency
3. initial pressure and superheat
4. all of the mentioned
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Question 77 : The pipes carrying steam are made up of?
1. Steel
2. Copper
3. Aluminium
4. Iron
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Question 78 : The critical pressure ratio for initially wet steam is
1. 0.582
2. 0.546
3. 0.577
4. 0.601
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Question 79 : The purpose of governing in steam turbines is to
1. reheat the steam and improve its quality
2. maintain the speed of the turbine
3. reduce the effective heat drop
4. completely balance against end thrust
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Question 80 : Due to friction between the fluid & walls of the nozzle, the expansion process is?
1. reversible
2. irreversible
3. reversible adiabatic
4. irreversible adiabatic
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