262_Self_Marking_Quiz_SA

An overhead line conductor with a mass of 100kg is subject to a right angle wind force of 125N.

Using the mass of the conductor, calculate the weight (in Newtons) of the conductor assuming a gravitational pull of 9.8m/s²

An overhead line conductor with a mass of 100kg is subject to a right angle wind force of 125N.

Using the weight (in Newtons) of the conductor (assuming a gravitational pull of 9.8m/s²)

Using Pythagoras' Theorem, calculate the resultant force (in Newtons) on the conductor to 2 decimal places

c² = a² + b²

Using the following formula:

T = (WL²)/(8S)

Transpose the formula to make S the subject and calculate the overhead line sag for the overhead line conductor to 2 decimal places with following information: (5 marks) - Span between supports is 100m - Weight of conductor is 1.5N/m - Tension is 4.5kN (to 2 decimal places)

From the following information from a mechanical machine: -

Effort force = 125N;

Weight of object 1000N;

Velocity ratio (VR) = 15

Calculate the mechanical advantage (MA)

Given Load = Mechanical Advantage x Effort

Calculate the machine % efficiency given that:

MA = Efficiency x Velocity Ratio

and Mechanical Advantage = 8 and VR = 15

to 4 s.f.

Given MA = Efficiency x Velocity Ratio

If the velocity ratio (VR) was increased how would this affect the efficiency?

• Efficiency would increase

• Efficiency would decrease

• There would be no change in efficiency

• The mechanical advantage would increase

If the weight of the object increased but the effort force stayed the same, how would this affect the mechanical advantage (MA)

Given Load = Mechanical Advantage x Effort

• MA would increase

• MA would decrease

• MA would stay the same

• Effort would also increase

Given Load = Mechanical Advantage x Effort

If the effort force required increased but the weight of the object remained constant, how would this affect the mechanical advantage (MA)

• MA would decrease

• MA would increase

• Effort would also increase

• MA would stay the same

Given Given Load = Mechanical Advantage x Effort

If the effort force required and the weight of the object both increased by 10%, how would this affect the mechanical advantage (MA)

• MA would increase

• MA would decrease

• MA would stay the same

• The force would increase more (in percentage terms) than the load