ω₁.ω₂.r
(ω₁ - ω₂)r
(ω₁ + ω₂)r
(ω₁ - ω₂)2r
B. (ω₁ - ω₂)r
Less than unity
Equal to unity
Greater than unity
Zero
ω
ωr
ω²r
ω/r
4, 4
4, 5
5, 4
4, 6
(r₁ + r₂) (y/x)
(r₁ + r₂) (x/y)
(r₁ - r₂) (y/x)
(r₁ - r₂) (x/y)
± c.m.ω².r
± a (1 - c) m.ω².r
± (a/√2) (1 - c) m.ω².r
± 2a (1 - c) m.ω².r
Enhance the load carrying capacity of the jack
Reduce the effort needed for lifting the working load
Reduce the value of frictional torque required to be countered for lifting the load
Prevent the rotation of load being lifted
Double helical gears having opposite teeth
Double helical gears having identical teeth
Single helical gear in which one of the teeth of helix angle a is more
Mutter gears
Wear is less
Power absorbed is less
Both wear and power absorbed are low
The pressure developed being high provides tight sealing
Mean speed to the maximum equilibrium speed
Mean speed to the minimum equilibrium speed
Difference of the maximum and minimum equilibrium speeds to the mean speed
Sum of the maximum and minimum equilibrium speeds to the mean speed
Inner dead centre
Outer dead centre
Right angles to the link of the stroke
All of the above
Difference of minimum fluctuation of speed and the mean speed
Difference of the maximum and minimum speeds
Sum of maximum and minimum speeds
Variations of speed above and below the mean resisting torque line
Lower pair
Higher pair
Self-closed pair
Force-closed pair
Quick return mechanism of shaper
Four bar chain mechanism
Slider crank mechanism
Both (A) and (C) above
Compound gears
Worm and wheel method
Hooke's joint
Crown gear
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed
Varies inversely with the square of the speed
Positive throughout
Negative throughout
Positive during major portion of the stroke
Negative during major portion of the stroke
The algebraic sum of the secondary forces must be equal to zero
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
Both (A) and (B)
None of these
ω² R cosθ
ω² (R - r₁) cosθ
ω² (R - r₁) sinθ
ω² r₁ sinθ
Machine
Structure
Mechanism
Inversion
The mass of two are same
C.G. of two coincides
M.I. of two about an axis through e.g. is equal
All of the above
Angular acceleration of the body
Moment of inertia of the body
Periodic time of the body
Frequency of vibration of the body
10°-15°
15°-25°
25°-30°
30°-40°
On their point of contact
At the centre of curvature
At the centre of circle
At the pin joint
n/2
n
n - 1
n(n - 1)/2
Yes
No
It is a marginal case
Data are insufficient to determine it
The system is critically damped
There is no critical speed in the system
The system is also statically balanced
There will absolutely no wear of bearings
Lower pair
Higher pair
Open pair
Close pair
Can be used
Cannot be used
Unpredictable
None of these
Have line contact
Have surface contact
Permit relative motion
Are held together
l = (1/2).(j + 2)
l = (2/3).(j + 2)
l = (3/4).(j + 3)
l = j + 4