Welcome to your 2365 623 Fault Diagnosis. This mock exam is not a substitute for proper teaching or revision and should only be used as a resource to prepare learners for the exam. The questions (along with the wording and diagrams) contained within the bank of this exam are purely made up by our lecturers and not copied from any actual qualification exam. So while this is an excellent free revision resource, please do not rely on these exam questions alone to help you be successful within your qualifications. When you are ready, please press "start quiz".
1.
Which of the following would most likely cause a motor to not work, if the circuit is healthy?
2.
During a continuity of Ring final conductors test in a domestic building, ten sockets give a R1+R2 reading of 0.5Ω, but an additional three sockets in the garage from the same circuit gives readings of 0.6Ω, 0.7Ω and 0.8Ω respectively. What might that indicate?
3.
Which of the following could be the most likely factor that could affect rectifying a fault?
4.
To maintain accurate readings, an instrument should?
5.
Which test is the most accurate to test the sensitivity of an RCD?
6.
Which of the following would be the most likely cause of the final light in a lighting circuit not working, when the other lights do
7.
When are GS38 leads required?
8.
When should an RCD trip, if the setting of half the rating of the RCD is used
9.
A low reading ohmmeter used to perform a continuity of protective conductor test, should record results in?
10.
Which logical step would come first, when approaching fault diagnosis?
11.
The non-statutory document detailing the care and use of tests instruments, leads and probes is?
12.
If a copper conductor was halved in length, the resistance would?
13.
Which logical stage should be carried out first, before carrying out fault diagnosis?
14.
When should an RCD trip, if the setting of 1 times the rating of the RCD is used
15.
If an RCD has operated, which fault is most likely to cause this?
16.
If an MCB is able to reset after a small duration of time after it has been operated, what is the likely cause?
17.
Which of the following is likely to cause a transient voltage spike?
18.
Which of the following would NOT be acceptable for performing an insulation resistance test?
19.
Once a short circuit fault has been diagnosed and rectified, what is the next step in regards to testing?
20.
If a copper busbar is drawing a current of 300A, what will be the physical effect on the actual busbar?
21.
A faulty lighting circuit which was supplied from a 230V, 50Hz single phase supply and a recorded Ze of 0.8Ω. The resistance of R1 was measured at 1.54Ω and the R2 was measured as 1.98Ω. What would the Zs expected to be?
22.
If an RCD has tripped due to a fault, which test would be most suitable to verify the fault?
23.
Which of the following could be the most likely factor that could affect rectifying a fault?
24.
The correct safe isolation procedure on a 3 phase circuit will result in a voltage indicating device being connected across terminals, in how many different combinations to ensure it is adequately proved dead?
25.
A polarity test is conducted to verify that?
26.
Which is likely to be the first source to help with fault diagnostics?
27.
What documentation may be used to record fault diagnostics work?
28.
The insulation resistance test voltage for a SELV installation is?
29.
What is the importance of verifying readings obtained with those listed within BS7671 and associated documents?
30.
If 2 cables are connected together in series and measured the overall resistance will?
By Neil