A fixed pulley is driven by a 100 kg mass falling at a rate of 8.0 m in 4.0 s. It lifts a load of 75.0 kgf.
Calculate : the height to which the load is raised in 4.0 s.
Calculate : the height to which the load is raised in 4.0 s.
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Machines question types
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163
Questions
7
Question groups
5
Question types
01
[1 Mark Question Answer]
38 Q→02[2 Mark Question Answer]
31 Q→03[3 Mark Question Answer]
36 Q→04[5 Mark Question Answer]
6 Q→05TRUE / FALSE
4 Q→06MCQ
40 Q→07fill in the blanks.
8 Q→Sample Questions
Machines questions
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In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the load raised upwards?
What is the velocity ratio of a single fixed pulley?
What is the ideal mechanical advantage of a single fixed pulley? Can it be used as a force
multiplier?
multiplier?
What is a single fixed pulley? State its one use.
A block and tackle system has 5 pulleys. If an effort 0f 1000 N is needed in the downward direction to raise a load of 4500 N, calculate:
(a) the mechanical advantage
(b) the velocity ratio, and
(c) the efficiency of the system
(a) the mechanical advantage
(b) the velocity ratio, and
(c) the efficiency of the system
In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find: (i) the mechanical advantage, (ii) velocity ratio and (iii) efficiency.
A Woman draws water from a well using a fixed pulley. The mass of bucket and water together is $6 kg$. The force applied by the woman is $70 N$. Calculate the mechanical advantage. $($ Take $g = 10 m s-^2)$
View full solution →Give two reasons why the efficiency of a single movable pulley system is not 100%?
What is a single movable pulley? What is its mechanical advantage in the ideal case?
In following figure , shows a block and tackle system of pulleys used to lift a load.
(a) How many strands of tackle are supporting the load?
(b) Draw arrows to represent tension in each strand.
(c) What is the mechanical advantage of the system?
(d) When load is pulled up be a distance 1 m, how far does the effort end move?
(a) How many strands of tackle are supporting the load?
(b) Draw arrows to represent tension in each strand.
(c) What is the mechanical advantage of the system?
(d) When load is pulled up be a distance 1 m, how far does the effort end move?
In following figure , shows a system of four pulleys, The upper two pulleys are fixed and the lower two are movable.
(a) Draw a string around the pulleys. Also show the place and direction in which the effort if applied.
(b) What is the velocity ratio of the system?
(c) How are load and effort of the pulley system related?
(d) What assumption do you make in arriving at your answer in part(c)?
(a) Draw a string around the pulleys. Also show the place and direction in which the effort if applied.
(b) What is the velocity ratio of the system?
(c) How are load and effort of the pulley system related?
(d) What assumption do you make in arriving at your answer in part(c)?
A pulley system has a velocity ratio 3 and an efficiency of 80%. Draw a labelled diagram of this pulley system Calculate:
(a) the mechanical advantage of the system and
(b) the effort required to raise a load of 300 N.
(a) the mechanical advantage of the system and
(b) the effort required to raise a load of 300 N.
In following figure , draw a tackle to lift the load by applying the force in the downward direction. Mark the position of load and effort.
(a) If the load is raised by 1 m, through what distance will the effort move?
(b) State how many strands of tackle are supporting the load?
(c) What is the mechanical advantage of the system?
(a) If the load is raised by 1 m, through what distance will the effort move?
(b) State how many strands of tackle are supporting the load?
(c) What is the mechanical advantage of the system?
A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied.
A block and tackle system has the velocity ratio 3. Draw a labelled diagram of the system indicating the points of application and the directions of load L and effort E. A man can exert a pull of 200 kgf.
If the effort end moves a distance 60 cm, what distance does the load move?
If the effort end moves a distance 60 cm, what distance does the load move?
A block and tackle system has the velocity ratio 3. Draw a labelled diagram of the system indicating the points of application and the directions of load and effort. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system is its efficiency is 60%?
In which direction the force need to applied, when a single pulley is used with a mechanical advantage greater than one? How can you change the direction of force applied without altering its mechanical advantage? Draw a labelled diagram of the system.
Draw a diagram of combination of three movable pulleys with a fixed pulley showing the directions of load, effort and tension in each strand. Find: (i) mechanical advantage, (ii) Velocity ration and (iii) efficiency of the combination in ideal situation.
The Diagram alongside shows an arrangement of three pulleys A, B, and C. The load is marked as L and the effort as E.
(a) Name the Pulleys A, B, and C.
(b) Mark in the diagram the directions of load (L), effort (E) and tension T1 and T2 in the two strings.
(c) How are the magnitudes of L and E related to the tension T1?
(d) Calculate the mechanical advantage and velocity ratio of the arrangement.
(e) What assumptions have you made in parts (c) and (d)?
(a) Name the Pulleys A, B, and C.
(b) Mark in the diagram the directions of load (L), effort (E) and tension T1 and T2 in the two strings.
(c) How are the magnitudes of L and E related to the tension T1?
(d) Calculate the mechanical advantage and velocity ratio of the arrangement.
(e) What assumptions have you made in parts (c) and (d)?
The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting the load.
The velocity ratio of a combination of n movable pulleys with a fixed pulley is always $2^n.$
View full solution →The velocity ratio of a single movable pulley is always 2.
The velocity ratio of a single fixed pulley is always more than 1.
A movable pulley is used as : ________ .
- ✓a force multiplier
- Ba speed multiplier
- Ca device to change the direction of effort
- Dan energy multiplier
Answer: A.
View full solution →The mechanical advantage of an ideal single movable pulley is ________ .
- A1
- ✓2
- Cless than 2
- Dless than 1
Answer: B.
View full solution →A Single fixed pulley is used because it : ________ .
- AHas a mechanical advantage greater than 1
- BHas a velocity ratio less than 1
- CGives 100% efficiency
- ✓Helps to apply the effort in a convenient direction.
Answer: D.
View full solution →Class II levers are designed to have : ________ .
- AM.A. = V.R.
- BM.A. > V.R.
- ✓M.A. > 1
- DM.A. < 1
Answer: C.
View full solution →The lever for which the mechanical advantage is less than 1 has : ________ .
- AFulcrum at mid-point between load and effort.
- BLoad between effort and fulcrum.
- ✓Effort between fulcrum and load.
- DLoad and effort acting at the same point.
Answer: C.
View full solution →A scissors is a ___________ multiplier.
In class II lever, effort arm is __________ than the load arm.
Mechanical advantage = ___________ × velocity ratio
Mechanical advantage of single movable pulley is ________ [one/two/three].
Efficiency of ________ [practical/Idle] machine is less than 100%.
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