Inspection and Testing 2391/5357 Mock 2

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Use this to test your knowledge of 5357 unit 112 and 2391-51

1. Which of the following is the maximum voltage above which test leads must comply with GS38? *

1 point

a) 25V a.c

b) 25V d.c

c) 50V a.c

d) 50V d.c

2. Which of the following requirements from GS38 applies to test equipment which requires more than one test lead? *

1 point

a) The leads must be at least 1m in length?

b) The leads must have a C.S.A of at least 1.5mm2.

c) The leads must be colour coded for identification.

d) The leads must be permanently attached to the instrument?

3. Which of the following correctly describes the purpose of a continuity of ring final conductors test? *

1 point

a) To confirm the conductors are installed as a complete ring.

b) To confirm polarity is correct at each point on the circuit.

c) To determine R1+R2 value for the final circuit.

d) To confirm the conductors are the correct C.S.A

4. A test for continuity of circuit protective conductors is carried out at every point on a circuit. Which of the following describes the purpose of the test? *

1 point

a) To confirm correct polarity.

b) To confirm the conductors are the correct C.S.A to determine R1+R2 value for the circuit.

c) To confirm exposed conductive parts are connected to the M.E.T

d) To confirm each point has the correct neutral C.S.A

5. Which of the following factors directly affects the conductor resistance of a cable? *

1 point

a) Insulation and c.s.a

b) Length and c.s.a

c) Length and insulation

d) Load current and c.s.a

6. Two identical cables are connected in parallel. Which of the following describes the effect on the combined conductor resistance compared to the single cable? *

1 point

a) Doubled.

b) Quartered

c) Halved

d) No effect.

7. Which of the following factors affect the insulation resistance of a cable? *

1 point

a) Conductor cross sectional area

b) Cable length

c) Installation methods

d) Load current.

8. Four identical circuits are connected to a distribution board. Which of the following describes the effect on the combined insulation resistance at the DB when compared to that of a single circuit? *

1 point

a) Doubled.

b) Quartered

c) Halved

d) No effect.

9. Look at the figure below, which of the following describes the result of a line to earth fault at the load of the circuit? *

1 point

a) The fuse will operate and disconnect within the time required.

b) The will operate but not disconnect in the time required.

c) The fuse will not operate and disconnection will not be achieved

d) The fuse will operate and the load will continue to work.

10. Which of the following instruments must be used to measure the earth electrode resistance for a standby generator? *

1 point

a) Earth fault loop impedance tester.

b) Insulation resistance tester.

c) Low resistance ohmmeter

d) Earth electrode tester.

11. Which of the following describes the connection arrangements at the incoming DNO terminals for the earthing conductor in a 230V single phase TN-C-S supply? *

1 point

a) The supplier’s neutral and the installation earthing conductor are connected together.

b) The earthing conductor is connected to a separate conductor in the supply cable.

c) The earthing conductor is connected to a consumer’s earth electrode.

d) The earthing conductor is connected to earth through a sufficiently high impedance.

12. Which of the following is NOT a method used to determine that A.D.S for a final circuit has been achieved? *

1 point

a) Direct measurement of Zs at the furthest point on the circuit.

b) Adding the measured value of R1+R2 to Ze found by enquiry.

c) Adding the measured Ze to the R1+R2 for the circuit.

d) Measuring the prospective fault current at the furthest point on the circuit.

13. The purpose of the measurement of prospective fault current at the origin of an electrical installation is to determine whether: *

1 point

a) The required disconnection time is met.

b) The earth fault loop path can withstand the fault current.

c) The protective device can safely disconnect the maximum fault current.

d) Supplementary earth fault returns paths are required.

14. Which of the following is not a method for determining the prospective fault current at the origin of an installation? *

1 point

a) Enquiry to the DNO

b) Direct measurement.

c) Calculation using measured Ze and the supply voltage.

d) Calculation using the measured Zs of the supply voltage.

15. Which of the following correctly describes the relationship between prospective fault current and the fault current rating of a BSEN 60898 circuit breaker. *

1 point

a) Ipf≥Icn

b) Ipf≤Icn

c) Ipf≥In

d) Ipf≤In

16. Which of the following protective devices is not suitable to be used to disconnect fault currents in excess of 10KA? *

1 point

a) BS3036 fuse

b) BS88-3 fuse

c) BS88-2 fuse.

d) BSEN 60898 circuit breaker.

17. A 100 mA BSEN 61008 RCD is installed in a TT installation to provide fault protection. Which of the following identifies the maximum test current to be applied and the maximum disconnection time at that test current when testing the RCD? *

1 point

a) 100mA and 200mS

b) 100mA and 300mS

c) 500mA and 200mS

d) 500mA and 300mS

18. A 30mA BSEN 61009 RCBO is installed on a socket outlet circuit to provide additional protection. Which of the following identifies the maximum test current to be applied and the maximum disconnection time at that test current? *

1 point

a) 30mA and 300mS

b) 30mA and 200mS

c) 150mA and 300mS

d) 150mA and 40mS

19. Which of the following is not a suitable method of confirming phase sequence? *

1 point

a) Measuring using a rotating disc type instrument.

b) Measuring using an indicator type instrument.

c) Measuring using an approved voltage tester.

d) Checking polarity and connections throughout the installation.

20. The purpose of a functional test on an RCD carried out quarterly, using the integral test button, is to confirm? *

1 point

a) The correct functioning of the RCD in the event of a fault.

b) That the operation of the RCD complies with BS7671

c) That the RCD operates in the event of a short circuit.

d) The correct mechanical operation of the RCD mechanism.

21. A test is carried out on the interlock for switching an alternative power supply. Which of the following is the type of test being undertaken? *

1 point

a) Functional.

b) Continuity

c) Load

d) Installation

22. Following a test of earth fault loop impedance (Zs) the results are compared with the values given in BS7671. Which of the following describes the purpose of this comparison? *

1 point

a) To confirm correct test methods are used.

b) To confirm conductor C.S.A is suitable for the circuit.

c) To determine whether disconnection times will be achieved under earth fault conditions.

d) To determine whether the protective device will operate under short circuit conditions.

23. Checking that the measured test results meet the required values will enable the inspector to confirm that the electrical installation is. *

1 point

a) Correctly installed

b) Safe to be in service

c) Compliant with BS5266

d) Never going to be dangerous.

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