21.
Pack grouting with concrete is required between
A
rock and concrete lining
B
steel lining and concrete lining
C
both a and b
D
none of the above
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Pack grouting with concrete is required between
rock and concrete lining
steel lining and concrete lining
both a and b
none of the above
Mechanical ventilation method used in tunnels consists of
blowing fresh air
providing exhaust air by ducts
both a and b
none of the above
In tunnel, unless special provision is made for proper drainage, the gradient should not be more than
5%
7%
10%
12%
In case of tunnels in hilly areas to align tunnel ends use
direst ranging
reciprocal ranging
triangulation
any one of the above
For mucking the method employed is
hauling on rails
hauling on pneumatic tyres
using conveyers
all the above
Drift method of tunnelling is used to construct tunnel in
soft ground
running ground
rocks
broken grounds
Diverting water entering tunnel is
predrainage work
permanent drainage work
drainage work during construction
all the above
First tunnel built in the world was in Babylon, in the year
2000 BC
200 BC
200 AD
600 AD
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