What is mechanical advantage (MA)?
A
The ratio of velocity to time B
The ratio of load lifted to effort applied C
The ratio of power output to input D
The force needed to break a machine
Analysis & Theory
Mechanical Advantage (MA) is defined as the ratio of load lifted (L) to the effort applied (E).
What is the formula for maximum mechanical advantage in an ideal machine?
A
MA = Load × Effort B
MA = Velocity Ratio × Efficiency C
MA = Velocity Ratio (VR) D
MA = Effort / Load
Analysis & Theory
In an ideal (frictionless) machine, MA = VR because efficiency is 100%.
When does a machine achieve its maximum mechanical advantage?
A
When it moves fastest B
When it has no friction and 100% efficiency C
When it stops moving D
When it is overloaded
Analysis & Theory
Maximum MA occurs when the machine is ideal—no friction and 100% efficiency.
What is the condition for a machine to have MA = VR?
A
Effort = Load B
Efficiency = 100% C
Friction = Maximum D
Load = 0
Analysis & Theory
If efficiency is 100%, then MA = VR (no energy is lost).
What is the unit of mechanical advantage?
A
Newton B
Joule C
No unit D
Watt
Analysis & Theory
Mechanical Advantage is a ratio of two forces, so it is dimensionless and has no unit.
If a machine lifts 300 N load with 100 N effort, what is its mechanical advantage?
A
1.5 B
2 C
3 D
4
Analysis & Theory
MA = Load / Effort = 300 / 100 = 3.
Can the mechanical advantage of a real machine ever exceed the velocity ratio?
A
Yes, always B
No, never C
Only at high speeds D
Only if effort is zero
Analysis & Theory
MA can never exceed VR due to energy losses from friction (i.e., MA ≤ VR).
How does friction affect the mechanical advantage of a machine?
A
Increases MA B
Decreases MA C
Has no effect D
Reverses MA
Analysis & Theory
Friction reduces the actual output, thus decreasing the mechanical advantage.
Which of the following statements is TRUE for a machine with maximum mechanical advantage?
A
It has maximum friction B
It is reversible C
It is ideal and has 100% efficiency D
It consumes more power
Analysis & Theory
Maximum MA implies no energy loss, i.e., the machine is ideal with 100% efficiency.
If a machine has a velocity ratio of 4 and 100% efficiency, what is its maximum MA?
A
2 B
3 C
4 D
1
Analysis & Theory
For 100% efficiency, MA = VR = 4.