31 practice sets · Page 1 of 2
Whirling speed of the shaft is the speed at which
Shaft tends to vibrate in longitudinal direction
torsional vibrations occur
shaft tends to vibrate vigorously in transverse direction
combination of transverse and longitudinal vibration occurs
Which type of gearing is used in steering system of an automobile?
Rack and pinion
Worm and wheel
Spiral gears
None of the above
Which type of gear train is used in clock mechanism to join hour hand and minute hand?
Simple gear train
Compound gear train
Reverted gear train
Epicyclic gear train
Which one of the following is an exact straight line mechanism using lower pairs?
Watts mechanism
Grasshopper mechanism
Roberts mechanism
Paucelliers mechanism
Which of the following is an open pair?
Journal bearing
Ball and Socket joint
Leave screw and nut
None of the above
Which of the following is an inversion of Single slider crank chain?
Beam engine
Rotary engine
Oldhams coupling
Elliptical trammel
Which of the following is a higher pair?
Turning pair
Screw pair
Belt and pulley
None of the above
Which gear train is used for higher velocity ratios in a small space?
Simple gear train
Compound gear train
Reverted gear train
Epicyclic gear train
Which gear is used for connecting two coplanar and intersecting shafts?
Spur gear
Helical gear
Bevel gear
None of the above
What is the number of instantaneous centres for an eight link mechanism?
15
28
30
8
Transmission angle is the angle between
Input link and coupler
Input link and fixed link
Output link and coupler
Output link and fixed link
To connect two parallel and coplanar shafts the following type of gearing is used
Spur gear
Bevel gear
Spiral gear
None of the above
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
