Question 1 : Multi-stage steam turbines are of the
1. all of these
2. reaction type
3. pressure compounded type
4. velocity compounded type
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Question 2 : The steam leaves the nozzle at a
1. high pressure and a low velocity
2. high pressure and a high velocity
3. low pressure and a low velocity
4. low pressure and a high velocity
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Question 3 : The critical pressure gives the velocity of steam at the throat
1. less than the velocity of sound
2. more than the velocity of sound
3. none of these
4. equal to the velocity of sound
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Question 4 : Thermal equilibrium means that the flow of steam is
1. hyperbolic
2. polytropic
3. isentropic
4. isothermal
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Question 5 : The Parsons' reaction turbine has
1. only moving blades
2. fixed and moving blades of different shape
3. identical fixed and moving blades
4. only fixed blades
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Question 6 : The action of steam in a steam turbine is
1. dynamic
2. static
3. neither static nor dynamic
4. static and dynamic
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Question 7 : When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
1. none of these
2. underdamping
3. choked
4. overdamping
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Question 8 : The impulse reaction turbine has its driving force
1. none of the above
2. as a reaction force
3. as an impulsive force
4. partly as an impulsive force and partly as a reaction force
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Question 9 : The reheat factor is the ratio of the
1. total useful heat drop to the total isentropic heat drop
2. isentropic heat drop to the heat supplied
3. none of the above
4. cumulative heat drop to the isentropic heat drop
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Question 10 : The ratio of the workdone on the blades to the energy supplied to the blades, is called
1. blading efficiency
2. nozzle efficiency
3. gross or stage efficiency
4. mechanical efficiency
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