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City & Guilds Electrical - Multiple Choice

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City & Guilds Electrical - Multiple Choice

  2. 2. The role of a company's safety representative is to:<br />represent employees on safety matters.<br />be responsible for writing risk assessments.<br />represent the company at HSE meetings.<br />ensure safety facilities are available.<br />
  3. 3. An electric machine has a power output of 1500 watts. The input current is 4A and the applied voltage is 400V. The efficiency of the machine will be:<br />50%.<br />75%.<br />87.55%.<br />93.75%.<br />
  4. 4. If a contract is not completed on time the client may enforce a:<br />failure to agree.<br />contractual adjustment.<br />penalty clause.<br />prohibition notice.<br />
  5. 5. The device used to change a.c. to d.c in a d.c. generator called is the:<br />Poles.<br />Commutator.<br />Slip rings.<br />Brushes.<br />
  6. 6. An abnormal amount of carbon dioxide in an enclosed work space may cause:<br />unconsciousness or dizziness.<br />watering of the eyes.<br />skin irritation.<br />injury to the eyes.<br />
  7. 7. A water fire extinguisher has a red body and an indicating rectangle which is :<br />cream.<br />blue.<br />red.<br />black.<br />
  8. 8. Advice on safety matters can be obtained from the :<br />Royal Society for Prevention of Accidents .<br />Department of Health .<br />Learning and Skills Council .<br />Department for Trade and Industry .<br />
  9. 9. In a d.c motor armature, the difference between the applied voltage and the armature voltage drop is created because of the:<br />slip.<br />impedance.<br />back emf.<br />mutual inductive effect.<br />
  10. 10. The resistivity of a material is defined as the resistance when measured across the opposite faces of a cube of that material, of volume<br />1m3.<br />1 cm3.<br />1 mm3.<br />1 µm3.<br />
  11. 11. When equipment is deemed to be satisfactory for the job in hand it is described as :<br />performing well .<br />able for purpose.<br />satisfactory.<br />fit for the purpose intended.<br />
  12. 12. The procedure put in place by an employer to identify hazards in the workplace is called a <br />hazard control survey.<br />risk assessment procedure.<br />safety assessment.<br />risk control procedure.<br />
  13. 13. In a capacitor start, single phase, motor the capacitor is connected:<br />across the supply.<br />in parallel with the run winding.<br />in series with the run winding.<br />in series with the start winding.<br />
  14. 14. Safeguarding the rights of individuals with respect to sensitive information is contained in the <br />Health and Safety at Work Act.<br />Official Secrets Act.<br />Data Protection Act.<br />Human Rights Act.<br />
  15. 15. A risk assessment should be carried out <br />before turning on machinery.<br />after an accident in the workplace.<br />when work activities could put anyone at risk.<br />before work commences.<br />
  16. 16. When planning work schedules, a building site manager must:<br />take account of equipment costs.<br />take account of tea breaks.<br />ensure workers are competent.<br />co-ordinate the activities of workers from all trades.<br />
  17. 17. Supplementary protection against electric shock is provided by a:<br />overcurrent protection device.<br />residual current device.<br />BS 88 fuse.<br />cartridge fuse.<br />
  18. 18. The reactance of a 1µF capacitor connected across a 50Hz supply is:<br />3.18 kΩ.<br />31.8 kΩ.<br />3.18 mΩ.<br />318 Ω.<br />
  19. 19. Wound rotor induction motors are considered to be:<br />variable speed machines.<br />low torque machines.<br />constant speed machines.<br />low speed machines.<br />
  20. 20. The main function of a fuse is to protect:<br />against voltage ‘spikes’.<br />circuit conductors.<br />against electric shock.<br />the consumer control unit.<br />
  21. 21. The rotor conductors of a three phase cage rotor induction motor take the form of solid conductors:<br />connected to the supply via conductors.<br />in series with the rotor windings.<br />shorted at each end by rings.<br />connected to the supply via slip rings.<br />
  22. 22. If the plates of a parallel plate capacitor are increased in area, the capacitance will:<br />not change.<br />increase.<br />decrease.<br />reduce to zero.<br />
  23. 23. A transistor connected in 'common emitter mode' and biased to cause saturation will act as:<br />an open switch.<br />a current amplifier.<br />a controlled rectifier.<br />a closed switch.<br />
  24. 24. If a pure inductor of reactance 100Ω is connected across a single phase 230 V a.c supply, the power dissipated in the circuit will be:<br />0W.<br />529 W.<br />2.32 W.<br />23 kW.<br />
  25. 25. Earth leakage currents can occur naturally in electrical equipment, for example, cookers, fridges and freezers. This can cause nuisance tripping if the system is protected by a:<br />BS 1361 fuse.<br />solid state device.<br />residual current device.<br />cartridge fuse.<br />
  26. 26. Increasing the excitation, to the electromagnet in an a.c. generator will result in:<br />increased output frequency .<br />increased back emf.<br />reduced voltage output.<br />increased output voltage .<br />
  27. 27. Which one of the following correctly lists three losses inherent in a d.c machine :<br />Iron, Copper, Friction.<br />Copper, Friction, Hysteresis.<br />Current, Voltage, Hysteresis.<br />Iron, Copper, Magnetic.<br />
  28. 28. The centrifugal switch in a split phase motor is used to<br />disconnect the starter at full speed.<br />disconnect the run winding when approaching full speed.<br />disconnect the start winding when approaching full speed.<br />disconnect the main supply to the start winding above full speed.<br />
  29. 29. An electric heater dissipates a power of 3.0 kW when connected to a 230 V a.c. supply. The resistance of the heater is :<br />13.0 Ω.<br />15.65 Ω.<br />17.6 Ω.<br />35.2 Ω.<br />
  30. 30. When a semi conductor diode is connected across an a.c. supply having a peak value of 5 V, the peak inverse voltage across the diode is <br />2.5 V.<br />3.5 V.<br />5.0 V.<br />7.07 V.<br />
  31. 31. A circuit has a resistance of 20 Ω and an inductive reactance of 15Ω when connected to an a.c. supply. The impedance of the circuit is :<br />5.9 Ω<br />25.0 Ω<br />17.3 Ω<br />35.0<br />
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