Carbon is present in the form of __________ in grey cast iron. Flakes Nodular aggregates of graphite Spheroids Cementite TRUE ANSWER : ? YOUR ANSWER : ?
__________ of air does not increase with increase in temperature. Thermal diffusivity Density Viscosity Thermal conductivity TRUE ANSWER : ? YOUR ANSWER : ?
Tempering of a material does not improve its Machinability Softness Internal stress level Toughness TRUE ANSWER : ? YOUR ANSWER : ?
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about 0.95902777777778 1.2090277777778 0.37569444444444 0.70902777777778 TRUE ANSWER : ? YOUR ANSWER : ?
The weight of a body at the centre of the earth is Zero None of these Infinite Same as on the surface of the earth TRUE ANSWER : ? YOUR ANSWER : ?
Paint spray gun works on the principle of Bernoulli's theorem Boyle's law None of these Newton's law of viscosity TRUE ANSWER : ? YOUR ANSWER : ?
Castability of aluminium is increased by the addition of __________ in it. Lead Silicon Manganese Bismuth TRUE ANSWER : ? YOUR ANSWER : ?
For the irreversible reaction, Ca+ 2C = Ca C₂ , Δ H°298 = - 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be 90000 J 240000 J 60000 J 30000 J TRUE ANSWER : ? YOUR ANSWER : ?
Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to Troostite Bainite Sorbite Martensite TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not used as a fuel in rocket propellaht ? Liquid hydrogen Liquid oxygen Kerosene oil Liquid hydrazine TRUE ANSWER : ? YOUR ANSWER : ?