S1E1 Quiz - Looking to the Future 4

Which one of the following is NOT a correct statement about cable tray wiring support systems?

• Cable tray is used to support several sheathed cables following a shared, common route
• Cable tray is mostly found in commercial and industrial installations
• Cable tray is suitable for supporting single, unsheathed, conductors ('singles')
• Return flange cable tray is stronger and allows is to span greater distances without support

Which one of the following statements about cable tray is correct?

• Cable tray is available in only two finishes (galvanised and unfinished) and in any length required
• Cable tray is not suitable for installations where there are obstacles to be 'cleared' (routed around)
• Cable tray is available in a number of finishes, in widths of 50mm to 900mm and typically lengths of 3m
• Cable tray is the preferred choice over ladder rack systems in large, industrial installations

Which one of the following statements about ladder rack is correct?

• Ladder rack is the preferred choice over cable tray in small commercial installations
• Ladder rack is only suitable for smaller diameter sheathed cables as the distance between supporting 'rungs' is greater
• Ladder rack is so named because it resembles a ladder, where the ‘rungs’ provide the fixing points for the cable
• Ladder rack is available with side wall heights of between 50mm and 150mm but in only one width (500mm)

What is the main use of cable basket wiring support systems?

• For supporting a small number of large diameter cables in industrial installations
• For supporting a large number of small diameter single-insulated ('singles') in hazardous installations
• For running large numbers of small diameter cables (e.g., data cables) in commercial installations
• For supporting fire protection (FP) cables ONLY in commercial installations

Which one of the following statements is true about resistors in circuits?

• Resistors (or loads) can only be connected into circuits in two ways: series or parallel
• In order to calculate the total resistance in a circuit, all of the individual resistances need to be multiplied together
• The total resistance in any circuit can be easily calculated if you know the voltage
• The total resistance in a series circuit is equivalent to the sum of the individual resistances (all of the resistances added together)

Which of the following is the correct formula for calculating total resistance in a series circuit?

• 
• 
• 
• 

What is the total equivalent resistance of a circuit with three resistors, with values of 2, 3, and 5 Ohms?

• 30 Ohms
• 11 Ohms
• 10 Ohms
• 16 Ohms

What does Kirchhoff's Voltage Law state?

• That the law only applies to DC (direct current) and not AC (alternating current) circuits
• That the algebraic sum of all the voltage (drops) around a circuit is equal to the supply voltage
• That the supply voltage is the product of all of the voltage drops caused by each series resistance
• That voltage can only exist where there is resistance

What single statement below, best describes 'maintained' emergency lighting?

• Luminaires that are powered from the mains supply under normal conditions and this also keeps internal batteries charged. If the supply fails, the batteries keep the luminaire lit.
• Luminaires that are powered from the batteries supply under normal conditions which also keeps the luminaire lit if the main power fails
• Luminaires that are only illuminated during a power failure. At other times the luminaire is off.
• Luminaires that are only illuminated during a power failure from a mains generator. At other times the luminaire

Which single statement below is NOT correct in relation to alarm systems?

• Open circuit alarm systems are initiated (set off) when the circuit is broken or opened
• Open circuit alarm systems are initiated (set off) when the circuit is completed or closed
• Closed circuit alarm systems are initiated (set off) when the circuit is broken or opened
• Fire alarm circuits are intended for the protection of life and /or property