less
more
same
✅ The correct answer is option B.
Theory of machines MCQs
The frequency of oscillation of a compound pendulum is
✅ The correct answer is option C.
In a steam engine, the link constitutes a
piston, piston rod and crosshead
connecting rod with big and small end brasses, caps and bolts
crank pin, crankshaft and flywheel
all of the above
✅ The correct answer is option D.
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the
unbalanced couples are caused only at higher speeds
unbalanced forces are not dangerous at higher speeds
effects of unbalances are proportional to the square of the speed
effects of unbalances
✅ The correct answer is option C.
The two elements of a pair are said to form a higher pair, when they
have a surface contact when in motion
have a line or point contact when in motion
are kept in contact by the action of external forces, when in motion
permit relative motion
✅ The correct answer is option B.
The relative velocity of B with respect to A in a rigid link AB is
parallel to AB
perpendicular to AB
along AB
at 45° to AB
✅ The correct answer is option B.
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)
less than unity
equal to unity
greater than unity
zero
✅ The correct answer is option C.
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)
α = 45° +
α = 45° –
α = 90° + φ
α = 90° – φ
✅ The correct answer is option B.
The throw of the eccentric is equal to the valve travel.
Correct
Incorrect
✅ The correct answer is option B.