mechanical engineering MCQs – Page 183

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 Review each marked answer and report any item that may be outdated or unclear.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

3641. Center of pressure compared to e.g. is___________________?
0

A. above it

B. below it

C. none of the above

D. at same point

E. above or below depending on area of body

3642. Pressure of the order of 10? torr can be measured by__________________?
0

A. Pirani Gauge

B. McLeod gauge

C. micro-manometer

D. Bourdon tube

E. ionisastion gauge

3643. During the opening of a valve in a pipe line, the flow is_________________?
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A. unsteady

B. free vortex type

C. laminar

D. uniform

E. steady

3644. Principle of similitude forms the basis of_________________?
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A. performing acceptance tests

B. designing models so that the result can be converted to prototypes

C. hydraulic designs

D. comparing two identical equipments

E. comparing similarity between design and actual equipment

3645. Poise is the unit of________________?
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A. shear stress in fluids

B. surface tension

C. buoyancy

D. capillarity

E. viscosity

3646. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is _________________?
0

A. 0.6

B. 0.83

C. 0.4

D. 0.3

E. none of the above

3647. Working principle of dead weight pressure gauge tester is based on_______________?
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A. Daltons law of partial pressure

B. Newtons law of viscosity .

C. Pascals law

D. Avogadros hypothesis

E. Second law of thermodynamic

3648. In an isothermal atmosphere, the pressure___________________?
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A. varies in the same way as the density

B. decreases linearly with elevation

C. increases exponentially with elevation

D. unpredictable

E. remains constant

3649. The region between the separation streamline and the boundary surface of the solid body is known as__________________?
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A. wake

B. boundary layer

C. drag

D. aerofoil section

E. lift

3650. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?
0

A. 2.5 m

B. 3.0 m

C. 5.0 m

D. 2.4 m

E. 4.0 m

3651. If the surface of liquid is convex, men ___________________?
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A. cohesion pressure is negligible

B. cohesion pressure is increased

C. there is no cohesion pressure

D. cohesion pressure is decreased

E. none of the above

3652. Hot wire anemometer is used to measure_______________?
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A. pressure intensity of gas

B. discharge

C. pressure intensity of liquid

D. velocity of gas

3653. Kinematic viscosity is equal to_________________?
0

A. dynamic viscosity/density

B. dynamicviscosity x density

C. density/dynamic viscosity

D. same as dynamic viscosity

E. 1/dynamicviscosity x density

3654. The atmospheric pressure with rise in altitude decreases__________________?
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A. first slowly and then steeply

B. linearly

C. unpredictable

D. first steeply and then gradually

E. none of the above

3655. Which of the following instruments is used to measure flow on the application of Bernoullis theorem_________________?
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A. all of the above

B. nozzle

C. Venturimeter

D. pitot tube

E. Orifice plate

3656. The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will________________?
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A. increase

B. decrease

C. unpredictable

D. may increase or decrease depending on the characteristics of liquid

E. remain unaffected

3657. A pressure of 25 m of head of water is equal to_________________?
0

A. 245 kN/m2

B. 2.5kN/m2

C. 12.5 kN/m2

D. 25 kN/m2

E. 2500 kN/m2

3658. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
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A. 25 m/sec

B. 250 m/sec

C. 2 m/sec

D. 50 m/sec

E. 10 m/sec

3659. In a static fluid ___________________?
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A. fluid pressure is zero

B. viscosity is nil

C. linear deformation is small

D. resistance to shear stress is small

E. only normal stresses can exist

3660. The flow in which each liquid particle has a definite path and their paths do not cross each other is called__________________?
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A. steady flow

B. uniform flow

C. turbulent flow

D. streamline flow

E. one dimensional flow

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