Engineering Archives

18591. When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

[A]. slow speed engine

[B]. medium speed steam engine

[C]. high speed steam engine

[D]. none of these

✅ The correct answer is option B.

18592. Which of the following has the minimum atomic mass?

[A]. Oxygen

[B]. Sulphur

[C]. Nitrogen

[D]. Carbon

✅ The correct answer is option D.

18593. A left hand tool on a lathe cuts most efficiently when it travels

[A]. from left to right end of the lathe bed

[B]. from right to left end of the lathe bed

[C]. with the help of a compound slide

[D]. across the bed

✅ The correct answer is option A.

18594. Steam turbines are used for

[A]. large marine propulsion

[B]. electric power generation

[C]. direct drive of fans, compressors, pumps

[D]. all of these

✅ The correct answer is option D.

18595. The coke in the charge of blast furnace

[A]. controls the grade of pig iron

[B]. acts as an iron-bearing mineral

[C]. supplies heat to reduce ore and melt the iron

[D]. forms a slag by combining with impurities

✅ The correct answer is option C.

18596. Degree of saturation or percentage humidity is

[A]. the mass of water vapour present in 1 m3 of dry air

[B]. the mass of water vapour present in 1 kg of dry air

[C]. the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.

[D]. the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

✅ The correct answer is option C.

18597. Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

[A].

[B].

[C].

[D].

✅ The correct answer is option C.

18598. The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.

[A]. True

[B]. False

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✅ The correct answer is option A.

18599. The thermal efficiency of diesel engines is about

[A]. 15%

[B]. 30%

[C]. 50%

[D]. 70%

✅ The correct answer is option D.

18600. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.

[A]. Right

[B]. Wrong

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✅ The correct answer is option A.