41.
The type of gears used to connect two non parallel and non intersecting shafts is
A
Spur gear
B
Helical gear
C
Bevel gear
D
Spiral gear
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The type of gears used to connect two non parallel and non intersecting shafts is
Spur gear
Helical gear
Bevel gear
Spiral gear
The method of direct and reverse cranks is used in engines for
the control of speed fluctuations
balancing of forces and couples
kinematic analysis
vibration analysis
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
n = 3(l-1)-2j-h
n = 2(l-1)-2j-h
n = 3(l-1)-3j-h
n = 2(l-1)-3j-h
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is
1
2
3
4
Oldhams coupling is an inversion of the kinematic chain used in
Whitworth quick return mechanism
Elliptical trammel
Rotary engine
Universal joint
Module of a gear is
D/T
T/D
2D/T
2T/D
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20 degree is
18
20
30
34
Length of arc of contact is given by
Arc of approach - Arc of recess
Arc of approach + Arc of recess
Arc of approach / Arc of recess
Arc of approach x Arc of recess
In which of the following type of gear train the first gear and the last gear are co-axial
Simple gear train
Compound gear train
Reverted gear train
None of the above
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as
Critical damping ratio
Damping factor
Logarithmic decrement
Magnification factor
In a hydrodynamic journal bearing, there is
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
In a ball bearing, ball and bearing forms a
Turning pair
Rolling pair
Screw pair
Spherical pair
Hammer blow
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
A rigid body possesses ............. degrees of freedom
One
Two
Four
Six
A pulley and belt in a belt drive form a
cylindrical pair
turning pair
rolling pair
sliding pair
A higher pair has
Point contact
Surface contact
No contact
None of the above
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
2
4
3
None of the above
A ball and a socket forms a
Turning pair
Rolling pair
Screw pair
Spherical pair
..............is an inversion of Double slider crank chain
Coupling rod of a locomotive
Scotch yoke mechanism
Hand pump
Reciprocating engine
Ramsden eye-piece consists of
Two convex lenses short distance apart
Two concave lenses short distance apart
One convex lens and one concave lens short distance apart
Two Plano-convex lenses short distance apart, with the convex surfaces facing each other