A. The body should be bluff body
B. The body should be stream lined
C. Circulation around the body is essentially required
D. The main stream velocity must approach the velocity of sound in that fluid medium
Related Mcqs:
- Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________?
A. Specific gravity & temperature of the liquid
B. Leakage & pressure decreasing at higher elevations
C. Frictional resistance through pipes, fittings & passages
D. All A., B. and C. - What is the maximum theoretical suction lift (metres) of a reciprocating pump ?
A. 5
B. 10
C. 50
D. 100 - Purpose of air lift pump is to____________________?
A. Compress air
B. Lift compressed air
C. Lift water from a well by using compressed air
D. Lift air under negative pressure - Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?
A. 40
B. 34
C. 8
D. 37 - The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
A. Reynolds number
B. Froude number
C. Mach number
D. All A., B. and C. - The lift of a balloon is_________________?
A. Increased, as it rises to a higher altitude
B. Due to the weight of the atmospheric air, that it displaces
C. Not dependent on the temperature of the atmosphere
D. None of these - Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions ?
A. Re <> 1, accelerating flow
C. Re << 1, decelerating flow
D. Re >>1, decelerating flow - Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?
A. Df + Bf = Wf
B. Df = Bf + Wf
C. Df + Bf + Wf =0
D. None of these - Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton’s law of viscosity. (II) Newton’s second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary?
A. I, II, III
B. II, III, V
C. I, II, V
D. II, IV, V - Weber number is the ratio of inertial force to _____________ force?
A. Surface tension
B. Gravity
C. Viscous
D. Elastic
