30 Questions
What is the purpose of the crowned rim on a pulley in a flat belt drive system?
To help keep the belt running centrally on the pulley rim
Why are V-belts more advantageous than flat belts in terms of power transmission?
They utilize the advantage of the wedge action
What does the neutral section of a belt represent?
Section with no tension or compression
How is the effective radius of rotation of a pulley calculated for an unstretched belt?
By adding half the belt thickness to the radius of the pulley
What is one advantage of using a multiple V-belt system in comparison to a single V-belt system?
Higher power transmitting capacity
In a V-belt drive system, why does the belt not touch the bottom of the groove on the pulley?
To take advantage of the wedge action
What is the main reason for the sag of the belt being more on the upper side than the lower side?
The tight side being on the upper side.
Why is a crossed-belt drive adopted when the driven pulley needs to rotate in the opposite direction to the driving pulley?
To increase power transmission.
What happens if the belt slips over the pulley?
The belt wears out more quickly.
How does applying a small torque in the clockwise direction to the driving pulley affect the motion of the belt?
It tends to rotate the belt with it.
What does having a crossed-belt drive allow for in comparison to an open-belt drive?
Transmitting more power.
Why is sag on the upper side desirable in certain cases?
To prevent possible slip due to excessive tension on the lower side.
What prevents the pulley from slipping in the given context?
A counter-clockwise frictional force
How does the frictional force in the belt affect the tension?
It increases tension on one end and decreases on the other
What is the relationship between the tangential force on the pulley and the frictional force?
The tangential force is equal to the frictional force
What is the direction of the frictional force on the driven side of the pulley?
Counter-clockwise
What is the velocity ratio in the context of a belt and pulley arrangement?
The ratio of the speed of the driven pulley to the driving pulley
What happens if the tangential force on the pulley exceeds the frictional force?
The belt starts to slip
What is the relationship between the rotational speeds of the driving and driven pulleys?
N1 is equal to N2, neglecting slip and inelasticity
What is the law of belting?
The centre line of the belt must lie in the mid plane of the pulley it approaches
What happens if the belt is operated in the reverse direction on non-parallel shafts?
The belt will be thrown off the pulley
What is the role of guide pulleys in the operation of a belt on non-parallel shafts?
Guide pulleys allow the belt to operate in either direction
What is the significance of the thickness of the belt in the operation of a belt drive?
The thickness of the belt does not affect the operation of the belt drive
What is the role of the law of belting in the operation of a belt on non-parallel shafts?
The law of belting ensures that the centre line of the belt lies in the mid plane of the pulley it approaches
What type of connectors are primarily used when the distance between shafts is large?
Belts and ropes
Which type of drives are not positive, meaning their velocity ratios are not constant?
Belts and ropes
What is the primary cause for power transmission in belts and ropes?
Friction between the belt or rope and the pulley
What happens when the power transmitted by belts or ropes exceeds the force of friction?
The belt or rope slips over the pulley
What is the main purpose of keeping the connecting belt in tension in belt drives?
To prevent slipping between the belt and pulley
How can the speed of the driven shaft be varied in belt drives?
By varying the diameters of the two pulleys
Learn about the basics of power transmission using belts, ropes, chains, and gears. Understand the features and applications of belts, ropes, and chains in transmitting power over large distances, and the preference for gears for shorter distances.
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