2251. Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.
equalise
reduce
increase
✅ 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.
2252. When the piston is at T.D.C, the volume above the piston in the combustion chamber is the
clearance volume
cylinder volume
exhaust volume
none of these
✅ The correct answer is option A.
2253. In order to implement gear changes in the gear unit of an automatic transmission, a __________ is used.
synchronizer
planetary gear
magnetic clutch
hydraulic multi plate
✅ The correct answer is option D.
2254. The property of a bearing material which has the ability to accomodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as
bondability
embeddability
comformability
fatigue strength
✅ The correct answer is option C.
2255. The ductility of the material __________ with the decrease in percentage elongation of a specimen under tensile test.
increases
decreases
remains same
✅ The correct answer is option B.
2256. The density of a liquid in kg/m3 is numerically equal to its specific gravity.
TRUE
FALSE
✅ The correct answer is option A.
2257. A thermostatic expansion valve in a refrigeration system
ensures the evaporator completely filled with refrigerant of the load
is suitable only for constant load systems
maintains different temperatures in evaporator in proportion to load
none of the above
✅ The correct answer is option A.
2258. When the venturimeter is inclined, then for a given flow it will show __________ reading.
same
more
less
✅ The correct answer is option A.
2259. A Pelton wheel is
tangential flow impulse turbine
inward flow impulse turbine
outward flow impulse turbine
inward flow reaction t
✅ The correct answer is option A.
2260. The polar modulus for a hollow shaft of outer diameter (D) and inner diameter (d) is
✅ The correct answer is option C.