4731. In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.
TRUE
FALSE
✅ 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.
4732. The function of a safety valve is
to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
to indicate the water level inside the boiler to an observer
to measure pressure of steam inside the steam boiler
none of the above
✅ The correct answer is option A.
4733. The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.
more than
less than
same as
✅ The correct answer is option B.
4734. The battery is an electrochemical device, which means battery
makes chemicals by mechanical means
uses chemical action to provide electricity
has curved plates instead of flat plates
does not use an electrolyte
✅ The correct answer is option B.
4735. In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,
the algebraic sum of the primary forces must be equal to zero
the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
both (a) and (b)
none of these
✅ The correct answer is option C.
4736. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
top layer
bottom layer
neutral axis
every cross-section
✅ The correct answer is option B.
4737. If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to (where M = Bending moment)
M
M
M2
M3
✅ The correct answer is option A.
4738. Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle.
Yes
No
✅ The correct answer is option A.
4739. The turbine blades do not change the direction of steam issuing from the nozzle.
TRUE
FALSE
✅ The correct answer is option B.
4740. Defrosting of a refrigerator may be done by stopping the compressor for a short period.
Correct
Incorrect
✅ The correct answer is option A.