Systems Engineering Exam (2021)

The lever in the diagram below is used to lift a load of 60 N. The effort force, Fe, required to lift the load is

• 20 N
• 60 N
• 180 N
• 240 N

Which of the following gives the resistance and the tolerance of the resistor shown above?

• 251 Ω ± 5%
• 251 Ω ± 10%
• 250 Ω ± 5%
• 250 Ω ± 10%

A 7.5 kg mass that is attached to a rigid cable is accelerated horizontally to the right at 0.3 m s−2 on a smooth, frictionless surface, as shown in the diagram below. Ignore the mass of the cable. The tension in the cable is closest to

• 0.04 N
• 2.3 N
• 23 N
• 75 N

The diagram below shows an ideal pulley system being used to raise a load of 960 N vertically upwards. The effort applied by the worker is closest to

• 160 N
• 240 N
• 320 N
• 480 N

The diagram below shows a linkage mechanism that is connected to a motor. When the motor rotates clockwise, the motion produced by the wiper is

• rotary
• linear
• oscillating
• reciprocating

A wheel is used to open the valve shown below. The valve requires 18 N m to open. The operator can apply<br />a total force of 90 N on the wheel. In order for the operator to open the valve, which wheel diameter is required?

• 10 cm
• 20 cm
• 30 cm
• 40 cm

A cam and follower mechanism is shown in the diagram below. The two types of motion produced by the mechanism are

• oscillating and linear
• oscillating and rotary
• rotary and reciprocating
• oscillating and reciprocating

A lifting device with a mechanical advantage of 6.5 elevates an object of mass 52 kg. Taking acceleration due to gravity to be 10 m s−2, the input force of this system is closest to

• 8 N
• 80 N
• 338 N
• 3380 N

A conveyor belt uses 2000 J of electrical energy in one minute. During this time, it was measured to produce 200 J in sound energy and 500 J in heat energy throughout the system. Which one of the following gives the mechanical energy of the conveyor belt?

• 300 J
• 700 J
• 1300 J
• 2000 J

The gear ratio of the compound gears shown above is

• 1;3
• 1;6
• 3;1
• 6;1