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GATE (CE) 2022 : Fluid Mechanics and Hydraulics Quiz #9

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Question 1

A Jet of oil of relative density 0.8 and of area 0.01 m2 strikes a normally on a stationary plate V. The force exerted on the plate is at a velocity of 20 m/s.

Question 2

The allowable net positive suction head (NPSH) for a pump provided by the manufacturer for a flow of 0.3 m3/s is 3.5 m. The absolute vapour pressure head is 0.8 m, atmospheric pressure is 10.25 m (absolute) and the head loss from the reservoir to pump is 0.2 N-m/N. The maximum height of pump above the suction reservoir is …….. m ?

Question 3

Match List-I (Type of turbines) with List-II (Ranges of specific speeds in SI units) and select the correct answer using the codes given below the lists:
List-I
A) Francis
B) Kaplan
C) Pelton (one jet)
D) Pelton (two jet)
List-II
1) 8 - 30
2) 26 - 40
3) 40 - 420
4) 380 – 950

Question 4

A double overhung 1.5 m diameter impulse turbine installation is to develop 3000kW at 400 rpm under a net head of 300 m. If the overall efficiency is 0.90, then the diameter of the jet is ___________cm. (Take Description: E:\Gate\SSC JE Civil Part 1-Done\04_FM_BLok_files\image065.png, unit weight of water = 9.79 Description: E:\Gate\SSC JE Civil Part 1-Done\04_FM_BLok_files\image066.png)

Question 5

A pelton turbine is to operate under a net head of 800 m at 500 rpm. If a single jet with diameter 20 cm is used. The specific speed of the machine is ______.
[Take Cv = 0.98, ∅= 0.45 and overall efficiency ]

Question 6

A double overhung 1.5 m diameter impulse turbine installation is to develop 3000kW at 400 rpm under a net head of 300 m. If the overall efficiency is 0.90, then the diameter of the jet is ___________cm. (round off to the nearest integer) (Take Description: E:\Gate\SSC JE Civil Part 1-Done\04_FM_BLok_files\image065.png, unit weight of water = 9.79 Description: E:\Gate\SSC JE Civil Part 1-Done\04_FM_BLok_files\image066.png)
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Aug 11ESE & GATE CE