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Levers and Simple Machines

Workshop Calculation and Science, Module-9

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By Roni
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Levers and Simple Machines

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Q1: What is the ratio between the distance moved by the effort to the distance moved by the load?

  • Mechanical advantage
  • Velocity ratio
  • Efficiency
  • Fulcrum

Q2: What is the ratio of mechanical advantage to the velocity ratio of a simple machine?

  • Load
  • Effort
  • Efficiency
  • Power

Q3: What is the mechanical advantage, if a load of 1000 kg is lifted by a simple machine and effort applied is 250 kg?

  • 6
  • 8
  • 3
  • 4
Show Explanation

\[ \text{MA} = \frac{\text{Load}}{\text{Effort}} = \frac{1000}{250} = 4 \]

Q4: What is the velocity ratio of a wheel and axle if the radii of wheel and axle are 375 mm and 75 mm respectively?

  • 3
  • 4
  • 5
  • 6
Show Explanation

\[ \text{VR} = \frac{\text{Radius of Wheel}}{\text{Radius of Axle}} = \frac{375}{75} = 5 \]

Q5: What is the velocity ratio of a simple machine of a mass 120 kg is lifted to a height of 5 metres by a force of 60 kg moving 15 metre.

  • 1
  • 2
  • 3
  • 4
Show Explanation

\[ \text{VR} = \frac{\text{Distance moved by effort}}{\text{Distance moved by load}} = \frac{15}{5} = 3 \]

Q6: What is the efficiency of a simple screw jack having velocity ratio is 314.2 and mechanical advantage is 220?

  • 60%
  • 65%
  • 70%
  • 75%
Show Explanation

\[ \eta = \frac{\text{MA}}{\text{VR}} \times 100 = \frac{220}{314.2} \times 100 \approx 70\% \]

Q7: How much load is lifted if an effort of 25 kg is applied to a simple machine having velocity ratio of 4 and efficiency 75%?

  • 65 kg
  • 70 kg
  • 75 kg
  • 80 kg
Show Explanation

\[ \text{MA} = \frac{\eta}{100} \times \text{VR} = \frac{75}{100} \times 4 = 3 \]\[ \text{Load} = \text{MA} \times \text{Effort} = 3 \times 25 = 75\ \text{kg} \]

Q8: What is the name of fixed or supporting point of a lever?

  • Mechanical advantage
  • Fulcrum
  • Effort
  • Load

Q9: What effort required to lift a load of 150 kg in a wheel and axle, if the velocity ratio is 2.5 and the efficiency of the machine is 75%?

  • 70 kg
  • 80 kg
  • 90 kg
  • 100 kg
Show Explanation

\[ \text{MA} = \frac{\eta}{100} \times \text{VR} = \frac{75}{100} \times 2.5 = 1.875 \]\[ \text{Effort} = \frac{\text{Load}}{\text{MA}} = \frac{150}{1.875} = 80\ \text{kg} \]

Q10: What is called for the distance of the load from the fulcrum?

  • Effort arm
  • Load arm
  • Power arm
  • Effort

Q11: Which is example for first order lever?

  • A wheel barrow
  • A pair of scissors
  • Fire tongs
  • Lime squeezer

Q12: Which is example for second order lever?

  • Common balance
  • A pair of scissors
  • Bottle opener
  • Human forearm

Q13: Which is example for third order lever?

  • Common balance
  • Forceps
  • A pair of scissors
  • Lime squeezer

Q14: Which type of levers is bell cranked lever?

  • Curved lever
  • 1st order lever
  • 2nd order lever
  • 3rd order lever

Q15: Which order lever is claw hammer?

  • 1st order lever
  • 2nd order lever
  • 3rd order lever
  • Curved lever
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1st year, Workshop Calculation
WS Calc ITI
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