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

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

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 ?

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

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 C_v = 0.98, ∅= 0.45 and overall efficiency ]