MCQs Mechanical Engineering

1. A centrifugal  pump lifts 0.013m³/s water from a depth of 32m. If the pump motor consumes 6 Kw, what is the overall efficency of pump. Given density of water = 100kg/m³
(a) 88 %
(b)75 %
(c )69 %
(d) None of the above
Ans. C
2. The vanes of acentrifugal pump move due to –
(a) Pressure energy of water
(b) Kinetic energy of water
(c ) Both pressure and kinetic energy of water
(d) Power supplied by prime mover
Ans. D
3. The vanes of centrifugal pumps are usually
(a) curved forward
(b) curved backward
(c )radial 
(d) None of these
Ans.  B
4. In centrifugal pump, the liquid enters
(a) at the centre
(b) at the bottom
(C )at the top 
(d) from sides
Ans. A
5. Cavitation is caused by
(a) high velocity 
(b)low barometric pressure
(c )high pressure
(d)low pressure
Ans. D
6. A pump is defined as a device which converts
(a) hydraulic energy into mechanical energy
(b)mechanical energy into hydraulic energy
(c )kinetic energy into mechanical energy
(d) None of these
Ans. B
7. N. P. S. H. stands for
(a) Net Positive Supply Head
(b)Net Power Supply Head
(c )Net Positive Suction Height
(d) Net Positive Suction Head
Ans. D
8. Knematic  similarity between model and prototype means the similarity of
(a) forces
(b) shape
(c )motions
(d) discharge
Ans. C
9. Which one of the following option is based on 'Pascal's Law ' ?
(a) Hydraulic braking system
(b) Carburettor
(c )Fluid fly wheel
(d)Engine Lubrication System
Ans. A
10. Hydraulic Brahma's Press is based on –
(a) Bernoulli's Theorem
(b) Continuity equation
(c ) Pascal's law
(d) Darcy law
Ans. C
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