2111. In a fire tube boiler, the water is contained inside the tubes which are surrounded by flames and hot gases from outside.
TRUE
FALSE
✅ The correct answer is option B.
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.
2112. A feed gear box for a screw cutting lathe is designed on the basis of
geometric progression
arithmetic progression
harmonic progression
none of these
✅ The correct answer is option A.
2113. In skew bevel gearing, the axes of shafts are
intersecting and the teeth are curved
non-intersecting and non-parallel and the teeth are curved
non-intersecting and non-parallel and the teeth are straight
none of the above
✅ The correct answer is option C.
2114. A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.
Yes
No
✅ The correct answer is option A.
2115. Supercharging is the process of supplying the intake air to the engine cylinder at a density __________ the density of the surrounding atmosphere.
equal to
less than
greater than
✅ The correct answer is option C.
2116. The point of contraflexure occurs in
cantilever beams
simply supported beams
overhanging beams
fixed beams
✅ The correct answer is option C.
2117. Which of the following refrigerant has the highest freezing point.
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
✅ The correct answer is option B.
2118. The fuels in order of decreasing knock tendency for spark ignition engines are
paraffins, aromatics, napthenes
paraffins, napthenes, aromatics
napthenes, aromatics, paraffins
napthenes, paraffins,
✅ The correct answer is option B.
2119. In a reaction turbine
the steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
the expansion of steam takes place partly in the fixed blades and partly in the moving blades
the steam is expanded from a high pressure to a condenser pressure in one or more nozzles
the pressure and tempe
✅ The correct answer is option B.
2120. The viscosity of water at 20°C is
one stoke
one centistroke
one poise
one centipoise
✅ The correct answer is option D.