Hydraulic Machines-Fluid Machineries – Set 02

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Q1. The depth of the bucket for a Pelton wheel is generally _ the diameter of jet.

(A) Equal to
(B) 1.2 times
(C) 1.8 times
(D) Double

Answer:(B) 1.2 times

Q2. Motion of a liquid in a volute casing of a centrifugal pump is an example of

(A) Rotational flow
(B) Radial
(C) Forced spiral vortex flow
(D) Spiral vortex flow

Answer: (D) Spiral vortex flow

Q3. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

(A) 40%
(B) 50%
(C) 60%
(D) 80%

Answer: (B) 50%

Q4. When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

(A) Horizontal
(B) Nearly horizontal
(C) Steep
(D) First rise and then fall

Answer: (B) Nearly horizontal

Q5. In centrifugal pumps, maximum efficiency is obtained when the blades are

(A) Straight
(B) Bent forward
(C) Bent backward
(D) Radial

Answer: (C) Bent backward

Q6. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be

(A) Same
(B) 0.75 B.H.P.
(C) B.H.P./0.75
(D) 1.5 B.H.P.

Answer: (B) 0.75 B.H.P.

Q7. Air vessels in reciprocating pump are used to

(A) Smoothen flow
(B) Reduce acceleration to minimum
(C) Increase pump efficiency
(D) Save pump from cavitations

Answer: (B) Reduce acceleration to minimum

Q8. According to fan laws, at constant pressure, the speed capacity and power vary

(A) Directly as the air or gas density
(B) Inversely as square root of density
(C) Inversely as density
(D) As square of density

Answer: (B) Inversely as square root of density

Q9. Which of the following pump is generally used to pump highly viscous fluid?

(A) Centrifugal pump
(B) Reciprocating pump
(C) Air lift pump
(D) Screw pump

Answer: (D) Screw pump

Q10. Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

(A) Hydraulic ram
(B) Hydraulic intensifier
(C) Hydraulic torque converter
(D) Hydraulic accumulator

Answer: (C) Hydraulic torque converter

Q11. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

(A) High initial and maintenance cost
(B) Lower discharge
(C) Lower speed of operation
(D) Necessity of air vessel

Answer: (A) High initial and maintenance cost

Q12. Runaway speed of a hydraulic turbine is

(A) Full load speed
(B) The speed at which turbine runner will be damaged
(C) The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
(D) The speed corresponding to maximum overload permissible

Answer: (C) The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

Q13. An impulse turbine is used for

(A) Low head of water
(B) High head of water
(C) Medium head of water
(D) High discharge

Answer: (B) High head of water

Q14. The runaway speed of a hydraulic turbine is the speed

(A) At full load
(B) At which there will be no damage to the runner
(C) Corresponding to maximum overload permissible
(D) At which the turbine will run freely without load

Answer:(D) At which the turbine will run freely without load

Q15. A turbine pump is basically a centrifugal pump equipped additionally with

(A) Adjustable blades
(B) Backward curved blades
(C) Vaned diffusion casing
(D) Inlet guide blades

Answer: (C) Vaned diffusion casing

Q16. The overall efficiency for a Pelton wheel lies between

(A) 0.50 to 0.65
(B) 0.65 to 0.75
(C) 0.75 to 0.85
(D) 0.85 to 0.90

Answer: (D) 0.85 to 0.90

Q17. A double overhung Pelton wheel has

(A) Two jets
(B) Two runners
(C) Four jets
(D) Four runners

Answer: (B) Two runners

Q18. A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __ of the jet velocity

(A) One-half
(B) One-third
(C) Two-third
(D) Three-fourth

Answer: (B) One-third

Q19. For 450 m head of water, _ shall be used.

(A) Pelton wheel
(B) Kaplan turbine
(C) Francis turbine
(D) None of these

Answer: (A) Pelton wheel

Q20. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

(A) Pelton wheel
(B) Francis turbine
(C) Kaplan turbine
(D) None of these

Answer: (B) Francis turbine

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Hydraulic Machines-Fluid Machineries – Set 01
Hydraulic Machines-Fluid Machineries – Set 02
Hydraulic Machines-Fluid Machineries – Set 03
Hydraulic Machines-Fluid Machineries – Set 04
Hydraulic Machines-Fluid Machineries – Set 05
Hydraulic Machines-Fluid Machineries – Set 06
Hydraulic Machines-Fluid Machineries – Set 07
Hydraulic Machines-Fluid Machineries – Set 08
Hydraulic Machines-Fluid Machineries – Set 09