4211. A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
dry air
moist air
saturated air
specific humidity
✅ The correct answer is option C.
Mechanical Engineering
Prepare with the best Mechanical Engineering MCQs with answers and explanations for exams, interviews, and job tests. Our collection covers core topics such as engineering mechanics, thermodynamics, strength of materials, theory of machines, fluid mechanics, heat transfer, manufacturing processes, machine design, and power plant engineering. These Mechanical Engineering multiple-choice questions are designed for students, fresh graduates, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your technical knowledge and problem-solving ability with our updated and comprehensive Mechanical Engineering MCQs.
4212. When the backgear is engaged in a backgeared headstock, the spindle speed reduces considerably.
Agree
Disagree
✅ The correct answer is option A.
4213. A steel with carbon above 0.8% is known as hyper-eutectoid steel.
Agree
Disagree
✅ The correct answer is option A.
4214. Cutting and forming operations can be performed in a single operation in a
simple die
progressive die
compound die
combination die
✅ The correct answer is option D.
4215. The drill spindles are provided with standard taper known as
Morse taper
Seller’s taper
Chapman taper
Brown and Sharpe taper
✅ The correct answer is option A.
4216. The wave length corresponding to the maximum energy is inversely proportional to the absolute temperature. This statement is called Planck’s law.
Yes
No
✅ The correct answer is option B.
4217. A closed vessel made of steel and used for the generation of steam is called a
steam boiler
steam turbine
steam condenser
steam injector
✅ The correct answer is option A.
4218. The critical temperature is the temperature
below which a gas does not obey gas laws
above which a gas may explode
below which a gas is always liquified
above which a gas will
✅ The correct answer is option D.
4219. Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.
Correct
Incorrect
✅ The correct answer is option A.
4220. In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, This method will
cause withdrawing or throttling of steam
reduce length of effective stroke of piston
reduce maximum opening of port to steam
all of these
✅ The correct answer is option C.