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Electrics & control of plumbing & domestic heating Flashcards | StudBud
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Electrics & control of plumbing & domestic heating
Electrics & control of plumbing & domestic heating
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Phase 3
Flashcards
17 cards
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Practice quiz
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Questions
17
Answers
1
A reading of 0.2 Ohms to the live and earth of an immersion heater has been found. What describes what has happened?
Dead short – the element has blown and contacted with the copper casing
Reverse polarity – the live and neutral have been connected in reverse
Open circuit the element has overheated, blown and interrupted the circuit
2
At what stage should a proving unit be used?
After confirming that the supply is dead
Before and after confirming that the supply is dead
Before confirming that the supply is dead
3
The 18th Edition IET Wiring Regulations is also known as which British Standard document?
BS 6351
BS 5476
BS 7671
4
What device is being checked in the image below?
Thermistor
Capacitor
Thermocouple
Relay
5
Which component is designed to disconnect within 0.4 seconds if an imbalance is detected between live and neutral?
RCD
Cartridge fuse
MCB
ECO
6
What type of cable is shown in this image?
Flat PVC
SWA
Mineral insulated
Heat-resistant flex
7
Looking at the shaver socket in the image, what voltage would be present between points C and D?
115V
230V
400V
0V
8
What is the maximum number of spurs which can be made from any outlet on a ring main?
One spur
None allowed
No limit, as long as the maximum area does not exceed 100m2
9
What minimum size should the earth cable be between a TN-S supply and the MET connection?
12mm2
6mm2
16mm2
10mm2
10
Which of the following methods is not an approved method to ensure isolation of a circuit?
Securing the isolator off with a red cable tie and warning label
Securing the MCB in the off position with a clamp, lock and retaining key
Removing and retaining the fuse
Locking off the switch using the padlock and retaining the key
11
Which of the following is not classed as minor works?
Fault-finding on a central heating control system
The installation of a replacement heating circulator
The replacement of a consumer unit
12
What is the typical rated capacity of the suppliers fuse in the image below?
32 amp
100 amp
40 amp
125 amp
13
What is the most suitable flat PVC twin and earth cable size for a domestic ring main serving less than 100m2?
4mm2
1.5mm2
2.5mm2
6mm2
14
Which part of the Building Regulations covers electrical installation?
Part G
Part L
Part J
Part P
15
What fault is shown in this image?
Incorrect polarity
Incorrect continuity
Reversed phases
16
What piece of test equipment is the safest to use to determine the run current of a pump winding whilst operating?
Clamp meter
Insulation and continuity tester
Ammeter in series
Ammeter in parallel
17
What are correct colours of standardized three-phase supply cable conductors?
L1 – brown, L2 – black, L3 – grey
L1 – grey, L2 – black, L3 – blue
