Related Questions

In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where $$\mu $$ = Coefficient of friction between the blocks and the drum, $$\theta $$ = Semi-angle of each block subtending at the center of drum and n = Number of blocks)
A $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = \mu \theta {\text{n}}$$
B $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 - \mu \tan \theta }}{{1 + \mu \tan \theta }}} \right)^{\text{n}}}$$
C $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\mu \theta } \right)^{\text{n}}}$$
D $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 + \mu \tan \theta }}{{1 - \mu \tan \theta }}} \right)^{\text{n}}}$$
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where $$\mu $$ = Coefficient of friction between the blocks and the drum, $$\theta $$ = Semi-angle of each block subtending at the centre of drum and n = Number of blocks)
A $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_{\text{2}}}}} = \mu \theta \times {\text{n}}$$
B $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\mu \theta } \right)^{\text{n}}}$$
C $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 - \mu \tan \theta }}{{1 + \mu \tan \theta }}} \right)^{\text{n}}}$$
D $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 + \mu \tan \theta }}{{1 - \mu \tan \theta }}} \right)^{\text{n}}}$$
The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.
A One-third
B Two-third
C Double
D Three times
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the
A tension in the tight side of the belt
B tension in the slack side of the belt
C sum of the tensions on the tight side and slack side of the belt
D average tension of the tight side and slack side of the belt
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to
A Increase the key length
B Increase the key depth
C Increase the key width
D Decrease the key length
In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be
A Increase key length
B Increase key depth
C Increase key width
D Double all the dimensions
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
A 124 d
B 138 d
C 151 d
D 168 d
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)
A 1420 d
B 1680 d
C 2080 d
D 2840 d
The ratio of driving tensions in V-belt drives is __________ flat belt drives.
A Equal to
B sin$$\,\alpha $$ times more than
C sin$$\,\alpha $$ times less than
D cosec$$\,\alpha $$ times more than
The stretching in a belt can be controlled by __________ the stress in the belt.
A Reducing
B Increasing
C Both A and B
D None of these

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