MOCK EXAM from past papers - No. 2

This is a mock exam for the 17th edition C&G 2382 exam. All the questions are from past exam papers. In order to simulate the exam conditions we recommend using a stopwatch set to two hour. During that time you need to answer all 60 questions. Remember this is an open book exam so feel free to use the 17th edition of Wiring Regulations book.
You will find the correct answers on the last page of this mock exam. Good luck!

1) Final circuits exceeding 32A, in agricultural premises, should be protected by
a) A 100mA RCD
b) A 300mA RCD
c) A 500mA RCD
d) A 10mA RCD

2) The fundamental principles of BS7671 state that persons and livestock shall be protected against injury as a consequence of overvoltages originating from
a) motors running
b) the operation of circuit breakers
c) atmospheric events
d) voltage recovery

3) An electric shock due to inadequate fault protection can only be caused by
a) accidental touching of a phase conductor
b) class II equipment
c) touching conduit under fault conditions
d) SELV terminals

4) An electric shock due to inadequate basic protection can be caused by
a) touching the case of a class II portable drill
b) brushing a phase conductor with your hand
c) the circuit protective conductor being touched under energisation
d) a person touching conduit under fault conditions

5) What is the maximum Zs for a 10A type C circuit breaker protecting a standard discharge type lighting circuit
a) 1.15Ω
b) 2.19Ω
c) 1.44Ω
d) 1.92Ω

6) Socket outlets installed in an area containing a bathtub or shower must be installed
a) within zone 2 but outside zone 0
b) 3m horizontally from zone 1
c) 3m horizontally from zone 2
d) 3m horizontally from zone 0

7) Installations should be arranged so as to avoid danger in the event of a fault and to facilitate safe operation, inspection, testing and maintainance. One method of complying with this is to
a) connect all circuits on the single spur principle
b) connect all circuits on the radial principle
c) divide the installation into bands of circuits
d) connect all circuits on the ring principle

8) The information to be given to the local Electricity Supplier in order to establish the type and rating of the supply, prior to the construction of a new electrical installation is the
a) maximum demand
b) frequency and nature of current
c) nominal voltage
d) external impedance

9) Which of the following does not fall under compatibility
a) leakage of current
b) unbalanced loads
c) d.c. feedback
d) external influences

10) When considering external influences, the code AD3 requires IP rated equipment to
a) IPX0
b) IPX1
c) IPX2
d) IPX3

11) Diversity and maximum demand should be determined before beginning an installation
a) for a reliable and cost effective design
b) because the customer must be provided with the information
c) in order that the correct supply rating is used
d) as it is an REC requirement

12) When assessing the general characteristics of a circuit that needs a "continuity of service" one of the characteristics to be considered is
a) selection of the system earthing
b) number of conductors
c) how often it is used
d) where to install the isolator

13) When considering the installation of a large three-phase a.c. motor, additional protection should be made against
a) basic contact
b) high earth fault leakages
c) installation overvoltages
d) installation undervoltages

14) The maximum disconnection time for a 230v a.c. final circuit not exceeding 32A, with a TT supply is
a) 3s
b) 0.2s
c) 0.5s
d) 5ms

15) The maximum disconnection time for a 230v a.c. circuit with a TN supply is
a) 3s
b) 0.2s
c) 0.4ms
d) 5s