Correct
Incorrect
✅ The correct answer is option A.
Mechanical Engineering MCQs
A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero.
TRUE
FALSE
✅ The correct answer is option A.
The ignition in a spark ignition engine takes place when the piston is
exactly at the T.D.C. position on its compression stroke
approaching the T.D.C. position on its compression stroke
leaving the T.D.C. position on its compression stroke
approaching the T.D.C
✅ The correct answer is option B.
The reciprocating refrigerant compressors are very suitable for
small displacements and low condensing pressures
large displacements and high condensing pressures
small displacements and high condensing pressures
large displacements an
✅ The correct answer is option C.
When the engine speed increases, the ignition timing must be advanced.
Yes
No
✅ The correct answer is option A.
The positive plates of a lead acid battery has
lead peroxide (PbO2)
spongy lead (Pb)
lead sulphate (PbSO4)
sulphuric acid (H2SO4)
✅ The correct answer is option A.
The loss of pressure head in case of laminar flow is proportional to
velocity
(velocity)2
(velocity)3
(velocity)4
✅ The correct answer is option A.
If a pendulum is taken 1 km below the earth surface in a mine, it will __________ in time.
gain
loose
✅ The correct answer is option A.
High speed steel drills can be operated at about __________ the speed of high carbon steel drills.
one-half
one-fourth
double
four times
✅ The correct answer is option C.
The moment of inertia of a thin rod of mass m and length l,about an axis through its centre of gravity and perpendicular to its length is
ml2/4
ml2/ 6
ml2/8
ml2/12
✅ The correct answer is option D.