# Hydraulic Machines-Fluid Machineries – Set 02

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

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

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

Answer: (D) Spiral vortex flow

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

## 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

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

## 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

(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

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

## 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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