Question 41 : Blading efficiency is also known as
1. diagram efficiency
2. nozzle efficiency
3. stage efficiency
4. none of these
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Question 42 : The diagram efficiency is the ratio of
1. energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
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. none of the above
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Question 43 : The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called
1. stage efficiency
2. nozzle efficiency
3. mechanical efficiency
4. blading efficiency
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Question 44 : Reheating of steam in a turbine
1. reduces wear on the blades
2. increases the workdone through the turbine
3. increases the efficiency of the turbine
4. all of these
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Question 45 : Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?
1. all of these
2. A steam turbine develops higher speeds
3. The steam consumption is less
4. The efficiency of steam turbine is higher
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Question 46 : The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.
1. 2 times
2. 8 times
3. same as
4. 4 times
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Question 47 : The compounding of turbines is done in order to
1. reduce speed of rotor
2. reduce exit losses
3. improve efficiency
4. all of these
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Question 48 : The reheat factor depends upon
1. exit pressure
2. initial pressure and superheat
3. turbine stage efficiency
4. all of these
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Question 49 : The process of maintaining the speed of the turbine constant for various load conditions, is known as
1. reheating
2. bleeding
3. none of these
4. governing
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Question 50 : A nozzle is said to be a divergent nozzle
1. none of the above
2. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
3. when the cross-section of the nozzle increases continuously from entrance to exit
4. when the cross-section of the nozzle decreases continuously from entrance to exit
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