Mechanical Engineering Mcqs

Carbonation of coal is the process of________________________?

(A) pulverising coal in inert atmosphere
(B) heating wood in a limited supply of air at temperatures below 300°C
(C) strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
(D) binding the pulverised coal into brick-ettes
(E) enriching carbon in the coal

Submitted By :Ali Uppal

Submitted By :Ali Uppal

Submitted By :Ali Uppal

Pick up false statement?

(A) For petrol and large gas engines, quantity governingds preferred
(B) In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load
(C) In hit and miss governing, fuel supply is completely cut off during one or more number of cycles
(D) In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied
(E) For close regulation of speed, combination of both quality and quantity governing is used

Submitted By :Ali Uppal

Pick up the wrong statement?

(A) aluminium in steel results in excessive grain growth
(B) manganese in steel induces hardness
(C) nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility
(D) tungsten in steels improves magnetic properties and hardenability
(E) sulphur, phosphorous and lead im¬prove machining properties of steel

Submitted By :Ali Uppal

Choose the wrong statement?

(A) The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface
(B) The horizontal component acts through the center of pressure for the vertical projection
(C) The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
(D) he vertical component passes through the center of pressure of the volume
(E) Center of pressure acts at a greater depth than center of gravity

Submitted By :Ali Uppal

Choose the wrong statement ?

(A) any weight, floating or immersed in a liquid, is acted upon by a buoyant force
(B) Buoyant force is equal to the weight of the liquid displaced
(C) The point through which buoyant force acts, is called the center of buoyancy
(D) Center of buoyancy is located above the center of gravity of the displaced liquid v
(E) Relative density of liquids can be determined by means of the depth of flotation of hydrometer

Submitted By :Ali Uppal

Choose the wrong statement ?

(A) The center of buoyancy is located at the center of gravity of the displaced liquid
(B) For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy
(C) If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions
(D) For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy
(E) All floating bodies are stable

Submitted By :Ali Uppal

Choose the wrong statement?

(A) Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
(B) Viscosity is due primarily to interaction between fluid molecules
(C) Viscosity of liquids decreases with in-crease in temperature
(D) Viscosity of liquids is appreciably affected by change in pressure
(E) Viscosity is expressed as poise, stoke, or saybolt seconds

Submitted By :Ali Uppal

1 kg.m is equal to_________________?

Submitted By :Ali Uppal

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