1) The product of force (F) and time (t) is called as________.
a. momentum
b. work done
c. impulse
d. pressure
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2) What is the formula for forces exerted by fluid on a body?
a. (Rate of momentum in) x (Rate of momentum out)
b. (Rate of momentum in) – (Rate of momentum out)
c. (Rate of momentum in) + (Rate of momentum out)
d. None of the above
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Answer
Explanation
Related Ques
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ANSWER: (Rate of momentum in) – (Rate of momentum out)
Explanation:
No explanation is available for this question!
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3) The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by__________.
a. journal bearing
b. radial thrust bearing
c. both a. and b.
d. none of the above
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4) Meridonial velocity is the resultant of _____________ components of fluid velocity.
a. radial and tangential
b. tangential and axial
c. radial and axial
d. unpredictable
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5) _______________ components of fluid velocity have the responsibility of the transportation of fluid through the machine.
a. Radial and tangential
b. Tangential and axial
c. Radial and axial
d. None of the existing
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6) In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner?
a. Impulse turbine
b. Reaction turbine
c. Both a. and b.
d. None of the above
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7) The pressure of water is atmospheric and remains constant while passing over the runner in __________ .
a. Impulse turbine
b. Reaction turbine
c. Both a. and b.
d. None of the above
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8) The energy of water entering the reaction turbine is _______
a. fully the kinetic energy
b. fully the pressure energy
c. partly the pressure energy and partly the kinetic energy
d. unpredictable
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Answer
Explanation
Related Ques
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ANSWER: partly the pressure energy and partly the kinetic energy
Explanation:
No explanation is available for this question!
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9) Which of the following is an example of impulse turbine?
a. Propeller turbine
b. Francis turbine
c. Kaplan turbine
d. Pelton wheel
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10) The runner of __________ turbine always be under pressure of above atmospheric
a. Turgo
b. Girand
c. Kaplan
d. None of the above
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11) The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area.
a. constant
b. gradually decreasing
c. gradually increasing
d. uneven
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12) __________ turbines are also called as parallel flow turbine.
a. Radial flow
b. Axial flow
c. Both radial flow and axial flow
d. None of the above
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13) In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner?
a. Radial flow turbine
b. Axial flow turbine
c. Mixed flow turbine
d. All of the above
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14) What is the formula to calculate specific speed (Ns) of a turbine rotating at a speed of 'N' rpm that develops the power of 'P' kW at the heat of 'H' m?
a. (Ns) = (√N x P) x (H)(5/4)
b. (Ns) = (2 √N x P) x (H)(5/4)
c. (Ns) = (N √P) x (H)(5/4)
d. (Ns) = (2N √P) x (H)(5/4)
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15) Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine.
a. lower than
b. higher than
c. same as
d. unpredictable
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16) The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as__________
a. steam turbine
b. steam nozzle
c. steam area
d. all of the above
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17) How does the change in velocity of the steam in steam nozzle take place? Select the correct graph in the diagram below.
a. (1)
b. (2)
c. (3)
d. (4)
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18) The nozzle efficiency can be defined as the ratio of
a. isentropic enthalpy drop to actual enthalpy drop
b. actual enthalpy drop to isentropic enthalpy drop
c. isothermal enthalpy drop to isentropic enthalpy drop
d. isentropic enthalpy drop to isothermal enthalpy drop
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Answer
Explanation
Related Ques
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ANSWER: actual enthalpy drop to isentropic enthalpy drop
Explanation:
No explanation is available for this question!
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19) Which of the following are effects of nozzle friction?
1. Enthalpy drop decreases
2. Exit velocity reduces
3. Decrease in specific volume
4. Decrease in mass flow rate
a. (1), (2) and (3)
b. (2), (3) and (4)
c. (1), (3) and (4)
d. (1), (2) and (4)
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20) The quality of vapour at the exit of nozzle ___________ due to nozzle friction.
a. increases
b. decreases
c. does not change
d. unpredictable
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21) Pump transfers the mechanical energy of a motor or of an engine into _________ of a fluid.
a. pressure energy
b. kinetic energy
c. either pressure energy or kinetic energy
d. pressure energy, kinetic energy or both
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22) Which of the following is NOT a type of positive displacement pumps?
a. Reciprocating pump
b. Rotary displacement pump
c. Centrifugal pump
d. None of the above
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23) Rotary displacement pumps are suitable for handling ________.
a. oils
b. gritty liquids
c. both oils as well as gritty liquids
d. None of the above
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24) Which of the following is/are example/s of rotary displacement pumps?
a. Gear pump
b. Vane pump
c. Rotary piston pump
d. All of the above
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25) ___________ pump is also called as velocity pump.
a. Reciprocating
b. Rotary displacement
c. Centrifugal
d. Screw
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26) The mass flow rate of air compressed in axial flow compressor is _____________centrifugal compressor.
a. lower than
b. higher than
c. same as
d. unpredictable
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27) Which of the following is NOT a type of rotary compressor?
a. Positive displacement type of compressor
b. Steady flow compressor
c. Both a. and b.
d. None of the above
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28) Which compressors are suitable for large volume flow rates of above 1200 m3/min
a. Centrifugal compressors
b. Axial flow compressors
c. Both a. and b.
d. None of the above
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29) The function of _________ is to convert high kinetic energy of gases into pressure energy.
a. impeller
b. diffuser
c. casing
d. None of the above
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30) How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor?
a. Air velocity goes no increasing in impeller followed by diffuser
b. Air velocity goes no decreasing in impeller followed by diffuser
c. Air velocity increases in impeller and then decreases in diffuser
d. Air velocity decreases in impeller and then increases in diffuser
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Answer
Explanation
Related Ques
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ANSWER: Air velocity increases in impeller and then decreases in diffuser
Explanation:
No explanation is available for this question!
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31) A pair of fixed blade and rotor blade in axial flow compressor is called as _________.
a. step
b. pair
c. stage
d. state
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32) An axial flow compressors have _______.
a. a drum type rotor
b. a disc type rotor
c. a drum type rotor or a disc type rotor
d. none of the above
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33) ________ blades are attached to the rotor or spindle.
a. Fixed
b. Moving
c. Both fixed and moving
d. None of the above
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34) The basic principle of operation of axial flow compressor is _______that of the centrifugal compressor.
a. same as
b. totally different than
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35) The blade passages in a compressor are ________
a. converging
b. diverging
c. constant
d. unpredictable
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