8202-520 Elec June 2022 18A2

201: What is the first action to take after discovering an accidental fire on a construction site?

• Ring the HSE.

• Raise the alarm.

• Smother the flames.

• Find an extinguisher.

Answer explanation

The first action to take after discovering an accidental fire on a construction site is to raise the alarm to alert others and ensure everyone's safety.

201: Which instrument is required to carry out Safe Isolation?

• Loop Impedance Tester.

• Low Resistance Ohmmeter.

• Approved Voltage Indicator.

• Insulation Resistance Tester.

Answer explanation

An Approved Voltage Indicator is required for Safe Isolation to ensure the absence of voltage before working on electrical systems.

201: Which substance would require specialist licenced removal if found during a building demolition?

• Cement.

• Gypsum.

• Plywood.

• Asbestos.

Answer explanation

Asbestos is the substance that would require specialist licenced removal if found during a building demolition. As Asbestos is adangerous material to be around and requires a special training and disposing

201: What is the maximum voltage to earth of a single-phase reduced low voltage supply used on a construction site?

• 55 V

• 110 V

• 230 V

• 400 V

Answer explanation

The maximum voltage to earth of a single-phase reduced low voltage supply used on a construction site is 55 V, as per safety regulations.

201: Who is responsible for working out estimates for materials using a building design?

• Client.

• Architect.

• Clerk of works.

• Quantity surveyor.

Answer explanation

The quantity surveyor is responsible for working out estimates for materials using a building design.

201: What unit is equivalent to V x 10^-3?

• MV

• kV

• mV

• µV

Answer explanation

The unit equivalent to V x 10^-3 is mV, which stands for millivolt. The prefix 'm' represents a factor of 10^-3, making it the correct choice.

202: What is the cross-sectional area for the conductor shown in Figure 1?

• 6 mm²

• 10 mm²

• 16 mm²

• 25 mm²

202: Transpose to make VL the subject.

• 
• 
• 
• 

Answer explanation

To isolate VL, rearrange the formula to VL = P / (sqrt(3) * cos(phi) * Ib), matching the correct choice.

202: Which is a formula for calculating power?

• ( P = IR^2 )

• ( P = I^2R )

• ( P = VR^2 )

• ( P = I^2V )

202: A hot water cylinder is 1.4 m high and 0.45 m in diameter. What is the maximum volume of water this cylinder can hold?

• 0.22 m³

• 0.11 m³

• 0.44 m³

• 0.89 m³

Answer explanation

To find the volume of a cylinder, use the formula V = πr²h. Given r = 0.45/2 = 0.225 m and h = 1.4 m, calculate V = π(0.225)²(1.4) ≈ 0.22 m³. Therefore, the maximum volume of water the cylinder can hold is 0.22 m³.