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1. From a 50 metre cable drum, you have installed 13.6 metres of cable. What percentage of cable has been used?
2. An insulation resistance tester is used to record the following values: 55MΩ, 72MΩ, 55MΩ, 18.5Ω, 10 MΩ and 89MΩ. What is the mean of these values?
3. The SI unit for resistivity is?
4. Potential Difference is measured in?
5. In the SI system, time is measured in?
6. Which instrument would be used to measure the resistance of a circuit?
7. The SI unit for Capacitance is the?
8. A load generates a force of 300 Newton’s. Calculate the mass of the load.
9. Lifting a load an electric motor uses 180,000 Joules of energy in 1 ½ minutes. What is the power rating of the motor?
10. Crowbars are an example of what type of lever?
11. Force on a load is considered to be a combination of?
12. An electric motor has a 1.8 KW input and an efficiency of 88%. What is the motor’s output?
13. A four pulley system is required to lift a load force of 20000 Newton’s. What is the effort force required to lift this load?
14. A set of gears has a ratio of 16:1. The smaller cogwheel has 9 teeth. How many teeth does the larger cogwheel have?
15. Current is described as:
16. Porcelain is best described as?
17. A 2.5 mm2 copper conductor has a resistance of 1.5 Ohms. If the conductor’s length is doubled what would the resulting resistance be?
18. Four resistors each with an equal value of 6 Ohms are wired in parallel. What is the combined total resistance of the resistors?
19. A 5 Ohm resistor and a 7 Ohm resistor are wired in series and
connected to a 25 volt supply. What is the power dissipated in
the 7 Ohm resistor?
20. Which statement is correct with regards to what makes a good insulator?
21. Which of the following materials is a good conductor of electricity?
22. Which effect would make a Fuse blow?
23. A 16 Amp motor is connected to a cable with a very high resistance. Which of the following issues would occur?
24. Magnetic Flux Density is defined by:
25. To induce an EMF into a conductor, what must you do?
26. The formula to calculate the induced EMF within a conductor is:
27. How long would a conductor need to be to produce 12 Volts when passed through a 0.9 Tesla magnet at 4m/s?
28. In which of the following equipment would you expect to find a light dependant resistor?
29. Which device is used to change alternating current into direct current?
30. A motor supplies 12 KW of power, but is only operating at 80% efficiency. How much power does that motor take from the supply?
31. What is the insulator for an 11 KV overhead line made from?
32. What is the main purpose of ‘equipotential bonding’ ?
33. The following resistances are connected together in parallel. 2 Ohm, 5 Ohm, 10 Ohm and 5 Ohm. What is the total resistance?
34. Which one of the following is an example of an ‘exposed conductive part’ ?
35. If current in a circuit were to remain constant, and voltage were to be increased, the resistance of the circuit would:-
36. A length of electrical conductor has a length resistance of 1 Ohm. If its diameter was doubled what would happen to its resistance if the length remained the same?
37. A soft iron bar has a coil of insulated wire wrapped around it. If current flows in this conductor what does the device become?
38. Which one of the following formulas is used to determine resistance in an electrical circuit?
39. Which ONE of the following devices is NOT activated by heat?
40. A 2.5sq/mm twin and earth cable would usually be used for :-