mechanical engineering MCQs – Page 184

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

3661. In an immersed body, centre of pressure is __________________?
0

A. could be above or below e.g. depending on density of body and liquid

B. at the centre of gravity

C. unpredictable

D. below be centre of gravity

E. above the centre of gravity

3662. The equation of continuity holds good when the flow____________________?
0

A. is one dimensional

B. velocity is uniform at all the cross sections

C. none of the above

D. is steady

E. all of the above

3663. For pipes, turbulent flow occurs when Reynolds number is _____________________?
0

A. more than 4000

B. less than 2000

C. between 2000 and 4000

D. less than 4000

E. none of the above

3664. Which of the following is the unit of kinematic viscosity _________________?
0

A. pascal

B. poise

C. none of the above

D. stoke

E. faraday

3665. Two dimensional flow occurs when________________?
0

A. the direction and magnitude of the velocity at all points are identical

B. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

C. the velocity of successive fluid particles, at any point, is the same at successive periods of time

D. velocity, depth, pressure, etc. change from point to point in the fluid flow

E. the magnitude and direction of the velocity do not change from point to point in the fluid

3666. The value of mass density in kgsecVm4 for water at 0C is_________________?
0

A. 101.9

B. 1

C. 100

D. 91

E. 1000

3667. For pipes, laminar flow occurs when Roynolds number is__________________?
0

A. between 2000 and 4000

B. less than 4000

C. less than 2000

D. none of the above

E. more than 4000

3668. Buoyant force is___________________?
0

A. equal to the volume of liquid displaced

B. the resultant force on a body due to the fluid surrounding it

C. force necessary to keep a body in equilibrium

D. none of the above

E. resultant force acting on a floating body

3669. Flow occurring in a pipeline when a valve is being opened is________________?
0

A. laminar

B. unsteady

C. rotational

D. steady

E. vortex

3670. Manometer is used to measure__________________?
0

A. pressure in pipes, channels etc

B. difference of pressure between two points

C. very low pressure

D. atmospheric pressure

E. velocity

3671. Center of buoyancy is the___________________?
0

A. does not exist

B. center of pressure of displaced volume

C. centroid of the displaced volume of fluid

D. none of the above

E. e.g. of floating body

3672. Specific weight of water in S.I. units is equal to ________________?
0

A. 1000 N/m3

B. 9.81 N/m3

C. 10000 N/m3

D. 9.81 xlO6N/m3

E. 9.81 xlO3 N/m3

3673. Ratio of inertia force to elastic force is known as__________________?
0

A. none of the above

B. Webers number

C. Mach number

D. Reynolds number

E. Froude number

3674. Dynamic viscosity of most of the liquids with rise in temperature__________________?
0

A. increases

B. remains unaffected

C. decreases

D. unpredictable

E. none of the above

3675. Non uniform flow occurs when_________________?
0

A. the velocity of successive fluid particles, at any point, is the same at successive periods of time

B. velocity, depth, pressure, etc. change from point to point in the fluid flow

C. the direction and magnitude of the velocity at all points are identical

D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

E. the magnitude aricf direction of the velocity do not change from point to point in the fluid

3676. Newtons law of viscosity is a relationship between____________________?
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A. shear stress, velocity and viscosity

B. pressure, velocity and viscosity

C. shear stress and viscosity

D. shear stress, pressure and rate of angular distortion

E. shear stress anctthejiate of angular distortion

3677. The bulk modulus of elasticity with increase in pressure__________________?
0

A. increases

B. increases first up to certain limit and then decreases

C. unpredictable

D. decreases

E. remains constant

3678. According to Bernoullis equation for steady ideal fluid flow____________________?
0

A. total energy is constant throughout

B. velocity and pressure are inversely proportional

C. none of the above

D. the energy is constant along a stream-line but may vary across streamlines

E. principle of conservation of mass holds

3679. If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be________________?
0

A. w/h

B. h

C. h/w

D. h/wh

E. wh

3680. The two important forces for a floating body are__________________?
0

A. inertial, gravity

B. buoyancy, inertial

C. buoyancy, gravity

D. gravity, pressure

E. buoyancy, pressure

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