# A-Z JAMB Past Questions On Machine | See How To Solve JAMB Past Questions On Machine

## AfriEdu Team on this article gave detailed solution on machine mostly for 2021 Jamb students aiming to score high. A-Z Jamb questions on machine provides all you need to smile like others. It also, provides screenshot on live calculations performed by our team to help students make good grades on physics. See details of information below:

### 1. A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.

Efficiency=M.A/V.R*100%.......... eq( I)

Make V.R the subject of the formula

N.B: V.R= DE/DL 0.83
1.20
1.50
1.88

### 2. A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine 10.0
13.3
17.5
25.0

### 3. The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is

V.R = 6 (Number of Pulleys) from the diagram as numbered. Again, efficiency is 40%, Load is 120N and Effort is not givien which is represented by W. 28.0
48.0N
233.0N
50.0N

### 4. A 20kg mass is to be pulled up a slope inclined at 30o to the horizontal. If the efficiency of the plane is 75%, the force required to pull the load up the plane is [g = 10ms-2]

N.B- Velocity ratio of an inclined plane is the reciprocal of Sin titar. See solution for more clearification.

CLICK HERE TO SEE THE SOLUTION 13.3N
73.5N
133.3N
53.2N

AfriEdu Team

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