Electrical Quiz MCQ - Set 07 Electrical Quiz Quiz Questions 01. To facilitate ease of installation and assembly of equipment reference is made to (A) BS 7430 (B) Manufacturer's catalogues (C) GS 38 (D) Data charts 02. The purpose of a switch is to open or close a circuit (A) In the event of a fault current (B) Under load conditions (C) Under overload conditions (D) Automatically after a fault has been repaired 03. In order to prevent danger during maintenance operations, a voltage warning notice is required on all electrical accessories where (A) Voltage is present (B) The voltage exceeds 230V and such voltage would not be expected (C) The voltage exceeds 400V (D) The voltage is below 230V 04. The maximum operating temperature for a thermoplastic (pace) insulated cable with copper conductors is (A) 60° C (B) 70° C (C) 105° C (D) 160° C 05. Before any work is done within an electrical installation, the first procedure would be to (A) Carry out a risk assessment (B) Turn off the main switch (C) Remove all components (D) Install temporary supplies 06. An increase in current through a conductor will lead to (A) A decrease in conductor temperature (B) A decrease in conductor resistance (C) An increase in insulation resistance (D) An increase in conductor temperature 07. When carrying out repairs to the base of a street lighting column it is essential to wear (A) A safety harness (B) High visibility clothes (C) Gauntlets (D) High voltage clothing 08. In a star connected three phase transformer the (A) Three phases are connected together at the start point (B) Three phases are separate (C) Neutral conductor is connected to a single phase (D) Neutral conductor is electrically separated 09. A device with a BS EN number has been (A) Agreed for use only within the UK (B) Agreed for operational use within the EU (C) Standardized for all operational uses only in the UK (D) Standardized for use in the EU 10. Which of the following has an adverse effect on installed equipment? (A) Eddy current damping (B) Air damping (C) Ambient temperature (D) Operating temperature 11. When carrying out maintenance work on a distribution board in a busy walkway, it is advisable to protect others by the use of a (A) Warning sign (B) Safety barrier (C) Temporary bollard (D) Audible warning device 12. A circuit wired in 1.5 mm2 thermoplastic (PVC) twin with CPC cable is protected by a 16 A device and is used to supply a 230 V 3 kW water heater. If the cable has a rated voltage drop of 29 mV/A/m and the circuit is 24 m long, the actual voltage drop will be (A) 2.08 V (B) 9.07 V (C) 11.14 V (D) 69 V 13. Electrostatic sensitive equipment, in transit, need not be protected against damage from (A) High temperature (B) Dust and fibers (C) Moisture ingress (D) Day light 14. A single rotation of an alternator, intended to provide a 50 Hz supply frequency, will take (A) 2 ms (B) 20 ms (C) 50 ms (D) 5000 ms 15. First aid points are indicated using signs bearing a white cross on a (A) Yellow background (B) Blue background (C) Red background (D) Green background Submit Test Next Quiz Tests: Set 01 Set 02 Set 03 Set 04 Set 05 Set 06 Set 07 Set 08 Set 09
