Equal
Real
Complex conjugate
None of these
C. Complex conjugate
A triangle
A point
Two lines
A straight line
For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.
For involute gears, the pressure angle changes with the change in centre distance between gears.
The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.
All of the above
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
A thick film of lubricant between the journal and the bearing
No lubricant between the journal and the bearing
A forced lubricant between the journal and the bearing
Oldham's coupling
Elliptical trammel
Scotch yoke mechanism
All of these
1-3 m/s
3-15 m/s
15-30 m/s
30-50 m/s
Less than unity
Equal to unity
Greater than unity
Zero
Toothed gearing
Belt and rope drive
Ball and roller bearing
All of these
Stable
Unstable
Isochronous
None of these
Piston and cylinder of a reciprocating steam engine
Shaft with collars at both ends fitted into a circular hole
Lead screw of a lathe with nut
Ball and a socket joint
Dedendum
Addendum
Clearance
Working depth
10°
20°
30°
40°
l - 2
l - 1
l
l + 1
Turning pair
Rolling pair
Screw pair
Spherical pair
Perpendicular to sliding surfaces
Along sliding surfaces
Somewhere in between above two
None of the above
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
Decreases linearly with time
Increases linearly with time
Decreases exponentially with time
Increases exponentially with time
Velocity
Displacement
Rate of change of velocity
All of the above
2 links and 3 turning pairs
3 links and 4 turning pairs
4 links and 4 turning pairs
5 links and 4 turning pairs
(r₁ - r₂) (1 - cosθ)
(r₁ + r₂) (1 + cosθ)
(r₁ - r₂) [(1 - cosθ)/cos θ]
(r₁ + r₂) [(1 - cosθ)/cos θ]
Machines transmit mechanical work, whereas structures transmit forces
In machines, relative motion exists between its members, whereas same does not exist in case of structures
Machines modify movement and work, whereas structures modify forces
Efficiency of machines as well as structures is below 100%
Purely turning
Purely sliding
Purely rotary
Combination of sliding and turning
On their point of contact
At the centre of curvature
At the centre of circle
At the pin joint
Bolt and nut
Lead screw of a lathe
Ball and socket joint
Ball bearing and roller bearing
ω² × OQ
ω² × OQ sinθ
ω² × OQ cosθ
ω² × OQ tanθ
T/3
(T.g)/3
√(T/3m)
√(3m/T)
0.25
0.5
1
2
n = 3(l - 1) - 2j - h
n = 2(l - 1) -2j - h
n = 3(l - 1) - 3j - h
n = 2(l - 1) - 3j - h
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
Theory of machines
Applied mechanics
Mechanisms
Kinetics
Whitworth quick return mechanism
Hand pump
Oscillating cylinder engine
All of the above