In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be
0.96
0.97
0.98
0.99
Correct Answer :
A. 0.96
Related Questions
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Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
Transverse fillet welded joints are designed for
Tensile strength
Compressive strength
Shear strength
Bending strength
Turn buckle has
Right hand threads on bout ends
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed
Is maximum at zero speed and decreases monotonically with increase in speed
Becomes minimum at an optimum speed and then increases with further increase in speed
For steel, the ultimate strength in shear as compared to ultimate strength in tension is
1/2
1/3
1/4
2/3
Rivets are generally specified by
Thickness of plates to be riveted
Length of rivet
Diameter of head
Nominal diameter
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
d = t
d = 1.6 t
d = 2t
d = 6t
The helix angle for double helical gears may be made up to
45°
60°
75°
90°
A steel containing upto 0.15% carbon is known as
Mild steel
Dead mild steel
Medium carbon steel
High carbon steel
In most machine members, the damping capacity of the material should be
Low
Zero
High
Could be anything
The fatigue life of a part can be improved by
Electroplating
Polishing
Coating
Shot peening
When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)
d.t.τu
πd.t.τu
π/4 × d².τu
π/4 × d² × t.τu
The taper on cotter varies from
1 in 24 to 1 in 20
1 in 15 to 1 in 10
1 in 32 to 1 in 24
1 in 48 to 1 in 24
When the fulcrum is in between the load and effort, the lever is said to be of
First type
Second type
Third type
Any one of these
The suitable material for belt in agricultural machinery is
Leather
Rubber
Cotton duck
Balata gum
The value of stress concentration factor depends upon
Material and geometry of the part
Geometry of the part
Material of the part
None of these
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
Twice
Four times
Eight times
Sixteen times
Rankine Gordon formula for buckling is valid for
Long column
Short column
Short and long column
Very long column
The bearings of medium series have capacity __________ over the light series.
10 to 20 %
20 to 30 %
30 to 40 %
40 to 50 %
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.
Heavier
Lighter
Moderate
None of these
Creep in belt is due to
Material of the belt
Material of the pulley
Uneven extensions and contractions due to varying tension
All of the above
In a flange coupling, the bolts are subjected to
Tensile stress
Compressive stress
Shear stress
None of these
A double fillet welded joint with parallel fillet weld of length l and leg s is subjected to a tensile force P. Assuming uniform stress distribution, the shear stress in the weld is given by
√2P/s.l
P/2.s.l
P/√2.s.l
2P/s.l
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Ring nut
Castle nut
Sawn nut
Jam nut
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing
Boundary lubricated bearing
Zero film bearing
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Same
Coarser
Finer
Very fine
A leaf spring in automobiles is used
To apply forces
To measure forces
To absorb shocks
To store strain energy
The number of slots in a 25 mm castle nut is
8
4
2
6
A screw is said to be over hauling screw, if the
Friction angle is less than helix angle
Friction angle is more than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%
Maximum principal stress theory is applicable for
Ductile materials
Brittle materials
Elastic materials
All of the above