551. An oil filter bypass valve opens when the
engine is cold
engine overheats
oil filter becomes clogged
engine runs at high sp
✅ 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.
552. The leakage in a refrigeration system using freon is detected by
halide torch
sulphur sticks
soap and water
all of these
✅ The correct answer is option A.
554. According to Clavarino’s equation, the thickness of a cylinder is equal to (where d = Inner diameter of cylinder, p = Internal pressure, and μ = Poisson’s ratio. )
none of these
✅ The correct answer is option A.
555. In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. 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 B.
556. Which of the following statement is correct regarding petrol engines?
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure.
The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition.
all of the above
✅ The correct answer is option B.
557. When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as
die casting method
slush casting method
permanent mould casting method
centrifugal casting me
✅ The correct answer is option C.
558. The purpose of a thermostat in an engine cooling system is to
prevent the coolant from boiling
allow the engine to warm up quickly
indicate the coolant temperature
pressurise the system
✅ The correct answer is option B.
559. The process which improves the machinability of steels, but lowers the hardness and tensile strength is
normalising
full annealing
process annealing
spheroidising
✅ The correct answer is option D.
560. The distance between the centre of a rivet hole to the nearest edge of plate, is called
margin
pitch
back pitch
diagonal pitch
✅ The correct answer is option A.