Turbomachines Quiz | Turbomachines Short Questions and Answers

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Questions
41 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

Answer: oils
42 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

Answer: All of the above
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43 ___________ pump is also called as velocity pump.
A Reciprocating
B Rotary displacement
C Centrifugal
D Screw

Answer: Centrifugal
44 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

Answer: higher than
45 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

Answer: None of the above
46 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

Answer: Axial flow compressors
47 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

Answer: diffuser
48 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

Answer: Air velocity increases in impeller and then decreases in diffuser
49 A pair of fixed blade and rotor blade in axial flow compressor is called as _________.
A step
B pair
C stage
D state

Answer: stage
50 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

Answer: a drum type rotor or a disc type rotor
51 ________ blades are attached to the rotor or spindle.
A Fixed
B Moving
C Both fixed and moving
D None of the above

Answer: Moving
52 The blade passages in a compressor are ________
A converging
B diverging
C constant
D unpredictable

Answer: diverging
53 Which component of fluid velocity is responsible for transmission of power through rotodynamic machine?
A Radial
B Axial
C Tangential
D None of the above

Answer: Tangential
54 If (Vw1 u1 – Vw2 u2), then machine is called as________.
A compressor
B turbine
C pump
D all of the above

Answer: turbine
55 What is the head of water available at turbine inlet in hydro-electric power plant called?
A head race
B tail race
C gross head
D net head

Answer: net head
56 Gross head is the difference between __________.
A head race and tail race
B head race and net head
C head race and friction losses
D net head and friction losses

Answer: head race and tail race
57 What is runaway speed of the runner of Pelton wheel?
A maximum unsafe speed of the runner due to sudden increase in load on turbine
B minimum safe speed of the runner due to sudden increase in load on turbine
C maximum unsafe speed of the runner due to sudden decrease in load on turbine
D minimum safe speed of the runner due to sudden decrease in load on turbine

Answer: maximum unsafe speed of the runner due to sudden decrease in load on turbine
58 The gates of aerofoil section in between the outer and inner ring of guide wheel are called as ________.
A guide gates
B guide vanes
C scrolling gates
D scrolling vanes

Answer: guide vanes
59 Which of the following components of reaction turbine increases the head on the turbine by an amount equal to the height of runner outlet above the tail race?
A Scroll casing
B Guide vanes
C Moving vanes
D Draft tube

Answer: Draft tube
60 As the reaction turbine works on the principle of impulse and reaction, it follows the law of ________.
A impulse momentum
B angular momentum
C both a. and b.
D none of the above

Answer: angular momentum

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