their algebraic sum is zero
their lines of action are at equal distances
the algebraic sum of their moments about any point in their plane is zero
the algebraic sum of t
✅ The correct answer is option C.
Engineering Mechanics MCQs
If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
directly
inversely
✅ The correct answer is option A.
The length of a second’s pendulum is
94.9cm
99.4cm
100cm
101cm
✅ The correct answer is option B.
In ideal machines, mechanical advantage is __________ velocity ratio.
equal to
less than
greater than
✅ The correct answer is option A.
The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)
n
n2
2n
2n – 1
✅ The correct answer is option C.
The maximum efficiency of a lifting machine is
1/m
V.R./m
m/V.R.
1/(m x V.R.)
✅ The correct answer is option D.
The centre of gravity of a right angled triangle lies at its geometrical centre.
Correct
Incorrect
✅ The correct answer is option B.
For a self locking machine, the efficiency must be
equal to 50%
less than 50%
greater than 50%
100%
✅ The correct answer is option B.
The impact between two lead spheres is approximately equal to an __________ impact.
elastic
inelastic
✅ The correct answer is option B.