2901. The operation of making a cone-shaped enlargement of the end of a hole is known as
counter-sinking
counter-boring
trepanning
spot facing
✅ 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.
2902. The red flame during the operation of a bessemer converter indicates that the
air is burning out silicon and manganese
silicon and manganese has burned out and carbon has started oxidising
converter must be tilted to remove the contents of the converter
red flame does not occ
✅ The correct answer is option D.
2903. A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
sunk key
flat saddle key
hollow saddle key
tangent key
✅ The correct answer is option A.
2904. When a body is subjected to a direct tensile stress (σ) in one plane, the maximum shear stress is __________ the maximum normal stress.
equal to
one-half
two-third
twice
✅ The correct answer is option B.
2905. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.
TRUE
FALSE
✅ The correct answer is option A.
2906. When two elastic bodies collide with each other,
the two bodies will momentarily come to rest after collision
the two bodies tend to compress and deform at the surface of contact
the two bodies begin to regain their original shape
all of the above
✅ The correct answer is option D.
2907. The abrasive recommended for grinding materials of high tensile strength is
silicon carbide
aluminium oxide
sand stone
diamond
✅ The correct answer is option B.
2908. A steel alloy containing 36% nickel is called
stainless steel
high speed steel
invar
heat resisting steel
✅ The correct answer is option C.
2909. Strain is equal to (where l = Original length, and δl = Change in length)
l/δl
δl/l
l.δl
l + δl
✅ The correct answer is option B.
2910. Free pedal play in car clutches is about
15 mm
25 mm
40mm
60 mm
✅ The correct answer is option B.