Mechanical Engineering is part of Engineering and holds 2,078 questions with answers, free to read and with no account needed.
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Answer: D. be fully immersed with top surface at fluid surface
Equal specific gravity means the object and fluid share identical densities throughout their respective volumes. Neutral buoyancy causes the object neither to sink downward nor to float upward toward the air. The body re...
Answer: B. 0.6
Archimedes principle dictates that a floating body displaces a weight of fluid equal to its own weight. The specific gravity of a floating object equals the exact fraction of its total submerged volume. Sixty percent sub...
Answer: B. 245 kN/m2
Hydrostatic pressure is calculated by multiplying fluid density by gravitational acceleration and height of the fluid head. Substituting standard values gives one thousand kilograms per cubic meter multiplied by nine poi...
Answer: D. 6
Specific gravity is calculated as the weight of an object in air divided by its apparent loss in water. The weight of the object in air is three kilograms, while its immersed weight is two point five kilograms. Dividing...
Answer: D. IBR
Indian Boiler Regulations specifically govern the safety standards for steam generators nationwide. Statutory bodies in India enforce IBR compliance to prevent catastrophic high-pressure vessel failures. Design and const...
Answer: C. 0.515
The submerged fraction of a floating object equals its specific gravity divided by fluid gravity. Dividing seven by thirteen point six calculates the precise decimal submerged volume. Archimedes principle dictates that f...
Answer: C. remain same
Newton's third law dictates that an equal and opposite reaction force acts on the water container. The downward buoyant force exerted by the iron object creates an identical upward reaction on the water. These internal f...
Answer: E. none of the above
An ideal gas is a theoretical construct obeying the simple universal equation of state relating pressure and temperature. Real gases approximate this idealized behavior only under conditions of low pressure and sufficien...
Answer: A. higher self ignition temperature
Fuels with higher self-ignition temperatures resist premature auto ignition under high compression pressures. Decreased knocking tendencies occur when the air fuel mixture burns smoothly rather than exploding prematurely...
Answer: D. involves zero transverse component of flow
One-dimensional fluid flow occurs when fluid parameters vary along a single spatial coordinate. Transverse velocity components are perpendicular to the main flow direction in this classification. Zero transverse flow ens...
Answer: A. 10 kg
Pascal law states that pressure applied to an enclosed fluid is transmitted undiminished. The ratio of areas is calculated from the squares of the ram and plunger diameters. Dividing the one-tonne load by the area ratio...
Answer: E. highly turbulent flow
An elevated Reynolds number indicates that inertial forces dominate over viscous forces within the fluid flow. High inertial forces disrupt smooth streamlines and promote chaotic fluid mixing typical of turbulent flow re...
Answer: B. exists in several crystal forms at different temperatures
Allotropic and polymorphic substances change their internal crystal lattice geometry at specific temperature thresholds. This structural transformation occurs without altering the fundamental chemical composition of the...
Answer: B. more
Adhesive forces act between molecules of different substances like a liquid and a solid surface. Cohesive forces act between identical molecules within the liquid itself creating surface tension effects. When adhesion ex...
Answer: B. 4000 kg/cm2
Volumetric elasticity modulus is calculated as negative pressure change divided by fractional volume change. Pressure changes from fifty to one hundred fifty kilograms per square centimeter, giving a delta of one hundred...
