WorksheetsMachine Quiz
Total questions: 20
Worksheet time: 10mins
What is a machine?
A device used to overcome a large resistive force
A device used for communication
A device used for cooking
A device used to generate electricity
What is the ratio of load to effort known as?
Mechanical Advantage
Velocity Ratio
Work Input
Efficiency
What is the condition for a force multiplier in terms of Mechanical Advantage?
MA < 1
MA = 0
MA = 1
MA > 1
What is the principle of a lever based on?
Energy
Acceleration
Velocity
Moments
In a Class II Lever, where is the load positioned?
Between effort and fulcrum
At the fulcrum
Between fulcrum and load
Between effort and load
What is the value of Mechanical Advantage if effort arm is equal to load arm in a lever?
1
3
0
2
What is the ideal condition for a lever?
Rod is heavy and friction at the fulcrum
Rod is weightless and no friction at the fulcrum
Rod is elastic and no friction at the fulcrum
Rod is rigid and friction at the fulcrum
What is the relationship between Efficiency, Mechanical Advantage, and Velocity Ratio?
MA = VR + η
MA = VR x η
MA = VR / η
MA = VR - η
What is the condition for a speed multiplier in terms of Velocity Ratio?
VR < 1
VR = 1
VR = 0
VR > 1
What is the loss in energy in an actual machine mainly due to?
Friction and weight of moving parts
Lack of electricity
Excessive heat
Lack of lubrication
What is the ratio of work done on load by the machine to work done by effort on the machine?
Work Input
Efficiency
Mechanical Advantage
Velocity Ratio
What is the condition for an ideal machine?
Output energy equals input energy
Output energy is greater than input energy
Output energy is less than input energy
Output energy is zero
What is the principle of a machine based on?
Useful work done can never be greater than work done on the machine
Useful work done is always greater than work done on the machine
Useful work done is equal to work done on the machine
Useful work done is less than work done on the machine
What is the condition for a force multiplier in terms of Velocity Ratio?
Displacement of load is zero
Displacement of load is more than displacement of effort
Displacement of load is less than displacement of effort
Displacement of load is equal to displacement of effort
What is the condition for a speed multiplier in terms of Mechanical Advantage?
MA = 0
MA > 1
MA = 1
MA < 1
A single fixed pulley is used because it:
has mechanical advanatge greater than 1
has velocity ratio less than 1
gives 100% efficiency
helps to apply the effort in a conveninet direction
If the effort needed is less than the load, then mechanical advantage of the machine is:
Greater than 1
Less than 1
Equal to 1
None of these
What happens to the efficiency of a pulley system when the weight of the lower block increases?
Efficiency decreases
Efficiency becomes zero
Efficiency increases
Efficiency remains the same
What is the mechanical advantage of a block and tackle system with 6 pulleys?
5
4
7
6
What is the purpose of a single movable pulley?
To decrease velocity ratio
To increase mechanical advantage
To change the direction of effort applied
To lift heavy loads
