3451. The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as
supercharging
auto-ignition
scavenging
detonation
✅ The correct answer is option A.
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.
3452. Whenever a force acts on a body and the body undergoes a displacement, then
work is said to be done
power is being transmitted
body has kinetic energy of translation
none of these
✅ The correct answer is option A.
3453. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
1
1.25
2.15
5.12
✅ The correct answer is option B.
3454. In a screw jack, the effort required to lift the load is given by(where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
P = W tan (α – φ)
P = W tan (α + φ)
P = W tan (φ – α)
P = W cos (α + φ)
✅ The correct answer is option B.
3455. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
to dip the nose and tail
to raise the nose and tail
to raise the nose and dip the tail
to dip the nose and ra
✅ The correct answer is option C.
3456. In order to ram the sand harder at the back of the mould and softer on the pattern face, a __________ is used.
sand slinger
squeezing machine
jolt machine
stripper plate machine
✅ The correct answer is option B.
3457. Beryllium bronze has
high yield point
high fatigue limit
both (a) and (b)
none of these
✅ The correct answer is option C.
3458. The angle on which the strength of the tool depends is
rake angle
cutting angle
clearance angle
lip angle
✅ The correct answer is option A.
3460. The thermal or temperature stress is a function of
increase in temperature
modulus of elasticity
coefficient of linear expansion
all of these
✅ The correct answer is option D.