ESS revision quiz 2

Which one is "not" recommended required testing sequence

• (a)           Ring circuit continuity

• (a)           Protective conductor continuity

• (a)           Verification of polarity

• (a)           Measurement of insulation voltage

The ring final circuit is widely used. Therefore, it is important that each ring circuit (phase, neutral and protective conductors) should be

• complete and anyhow tested

• broken and discontinuous

• continuous and not broken

• connected anyhow

What is the formula for total resistance in figure 6-4

• 
• 
• 

In Singapore, lightning protection is governed by SS 555. In SS 555, lightning protection requirement is divided into how many protection levels

• 1

• 2

• 3

• 4

Which is not the main components of a lightning protection system are

• Air Termination Network

• Down Conductors

• Power Conductor

• Earth Terminations

Which one is not the advantages Of CCTV Fibre Optics

• Much smaller and lighter than copper.

• Easier and cheaper to install in long runs.

• Can carry far more information than copper such as the conversion of video analogue signals to digital signals is becoming more common place.

• Not immune to interference from electromagnetic sources.

The automated changeover from PUB electrical supply to emergency electrical supply through a generator is done by an auto-changeover device known as the

• Auto Transfer System (ATS)

• Manual Transfer System (MTS)

• Auto Kick Start System (AKSS)

• Auto Transfer Controller (ATC)

Public address (PA) system is

• Disturb the neighbor

• Announcement in Airport by Pilot

• For singing song like KTV

• a system of intercommunication within buildings for use for routine announcement, for emergency situations

What is the circuit for Figure 6-3

• Series

• Parallel

• Hexagon

• Rectangular

Formula for Voltage=

• Current x Resistance

• Current x current

• Resistance / current

• Resistance x resistance