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.
A low reading ohmmeter used to perform a continuity of protective conductor test, should record results in?
2.
A 3 phase motor circuit has been rectified, which of the following test should have been carried out on the circuit?
3.
If three conductors equal in length and with a resistance of 0.15Ω each are connected in series, what is the total resistance?
4.
Which of the following would be most important to be discussed with the client, prior to any fault diagnostics being carried out?
5.
The item shown in the photo serves what purpose?
6.
Which of the following is NOT a scale commonly found on an RCD tester?
7.
If an RCD has operated, which fault is most likely to cause this?
8.
A faulty heating 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 1.34Ω and the R2 was measured as 1.86Ω. What would the Zs expected to be?
9.
Which test is the most accurate to test the sensitivity of an RCD?
10.
Which logical stage should be carried out first, before carrying out fault diagnosis?
11.
Which of the following is the most likely of implications caused from fault diagnostics?
12.
An insulation resistance test is performed on a standard final circuit, what should the instrument be set to measure in?
13.
The non-statutory document detailing the care and use of tests instruments, leads and probes is?
14.
Which of the following would NOT be acceptable for performing an insulation resistance test?
15.
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?
16.
Which of the following could be the most likely factor that could affect rectifying a fault?
17.
If an MCB is able to reset after a small duration of time after it has been operated, what is the likely cause?
18.
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?
19.
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?
20.
Which device will protect circuits and equipment from transient voltages?
21.
Which test is the most logical test to be carried out, to verify a short circuit?
22.
If a two way switch is not always able to operate lights when it is in the correct position, what is the most likely cause?
23.
During a continuity of Ring final conductors test, 10 Sockets give a R1+R2 reading of 0.68Ω, but one socket gives a reading of 0.92Ω. What might that indicate?
24.
Which of the following could be the most likely factor that could affect rectifying a fault?
25.
It is recommended that test instruments are nulled to?
26.
To maintain accurate readings, an instrument should?
27.
Which of the following could cause an SPD to operate?
28.
If 2 different sized cables were connected together in parallel and measured using a low resistance ohmmeter, the overall resistance will
29.
A domestic heating circuit has been rectified and a new programmer was installed, what should the electrician do before leaving site?
30.
Which of the following faults, would likely cause a burning smell?
By Neil