1081. The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.
low
medium
high
✅ 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.
1082. The purpose of a cylinder head gasket is to
prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
prevent engine oil from going into combustion chamber
removes impurities from cylinder head lubricating oil
none of the above
✅ The correct answer is option A.
1083. In a reaction turbine when the degree of reaction is zero, then there is
no heat drop in moving blades
no heat drop in fixed blades
maximum heat drop in moving blades
maximum heat drop in f
✅ The correct answer is option A.
1084. In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.
more
less
✅ The correct answer is option B.
1085. The temperature of the inner luminous cone of neutral flame is about
1000° C
1250° C
2100° C
3200° C
✅ The correct answer is option D.
1086. Which of the following refrigerant has the lowest freezing point?
R-11
R-12
R-22
Ammonia
✅ The correct answer is option C.
1087. The hole to be drilled for tapping is __________ the outside diameter of the thread on the tap.
equal to
smaller than
greater than
✅ The correct answer is option B.
1088. The knocking tendency in spark ignition engines may be decreased by
controlling the air-fuel mixture
controlling the ignition timing
controlling the exhaust temperature
reducing the compressi
✅ The correct answer is option D.
1089. One molecule of oxygen is __________ times heavier than the hydrogen atom.
12
14
16
32
✅ The correct answer is option D.