Test your basic knowledge |

Subjects : science, engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The following motor leads are brought out of a 3-phase motor (T1 - T2 - T3 - T4 - T5 - T6). This motor is probably for...






2. The standard frequency of alternating current used at a mine is...






3. The combined capacitance of two capacitors in parallel is...






4. What steps up or steps down AC voltage?






5. What type motor is a wound-rotor induction motor?






6. Under fault conditions - the grounding resistor in a high voltage circuit limits the voltage drop in the grounding circuit external to the resistor to not more than...






7. Alternating current may be defined as...






8. When not connected to a load - the secondary leads of a current transformer should be...






9. Which of the following does a squirrel cage induction motor have?






10. The current on the primary side of a step-down transformer with a 4:1 ratio will be...






11. A transformer with a 1:1 ratio is usually a (an)...






12. The secondary windings on a 10:1 step-down transformer will have a wire size...






13. The size of a transformer is measured in...






14. Not an acceptable method for the installations of surface transformers?






15. What value of voltage will be measured from phase-to-phase - in a wye-connected secondary - if 2 -300 volts is measured from phase-to-ground?






16. All transformers step voltage up or down by...






17. Find the turns ratio of a single-phase transformer with the following values: Primary power of 10 KW - secondary current of 200 amps - and primary voltage of 250 volts.






18. If 13 -200 volts are measured from phase-to-phase across a wye-connected secondary - What is the phase-to-ground voltage?






19. The property of an electrical circuit that opposes any change in voltage is called...






20. Two 10-hp induction motors are operating on 460 volts AC. One motor is connected by single- phase; the other is connected in three-phase. The three-phase will...






21. If a voltmeter is connected between a phase lead and the ground of a three-phase 480-volt system - the meter will read...






22. When troubleshooting a circuit with a bank of capacitors - what precautions must be taken?






23. Operating coils - motors - transformers - relays and solenoids depend upon...






24. The primary leads of a single-phase transformer should be connected to the...






25. If any two-phase wires are reversed on a three-phase motor - the motor will...






26. What happens to a motor that is connected to a three-phase cable when two of the cable's leads are reversed?






27. A solenoid coil is...






28. A burn causing a blister is classified as a...






29. A transformer has a primary voltage of 2 -800 volts and a secondary reading of 140 volts. If there are 2000 turns on the primary - how many turns are on the secondary?






30. Why is 440-volt - three-phase power more commonly used in mining than 220-volt - three-phase power?






31. Find the turns ratio of a single-phase transformer with the following values: Primary power of 5KW - secondary current of 100 amps - and primary voltage of 250 volts.






32. Define alternating current...






33. A transformer has 2000 turns in the primary and 500 turns in the secondary. The primary voltage is 3 -200 volts. What is the secondary voltage?






34. If the conductors of a balanced - three-phase circuit pass through a current transformer - how many amps will flow in the transformer?






35. The load to which the secondary winding of a current transformer was connected has opened. The secondary leads should be...






36. The speed of an alternating current - squirrel-cage induction motor is...






37. Three-phase AC underground cables must be provided with overcurrent protection using a...






38. The primary function of a power transformer is to provide...






39. If you use a clamp-on ammeter or tong tester around all three-phase wires of an energized three- phase circuit simultaneously...






40. High voltage is used to transmit power over long distances...






41. Current that changes periodically in direction is...






42. A transformer has 1 -600 turns in the primary and 400 turns in the secondary. The primary voltage is 2 -400 volts. What is the secondary voltage?






43. Current transformers - or CT's - are used to...






44. A transformer with 3000 turns in the primary winding has a primary voltage of 4 -800 volts and a secondary voltage of 240 volts. How many turns are in the secondary winding?






45. To protect against over-current in a three-phase circuit over-current protection must be provided for...






46. What is the danger when working around capacitors?






47. A current transformer has a ratio of 350:5. If the phase current is 70 amperes - what would be the secondary current?






48. A transformer with 10 turns on the primary coil and 100 turns on the secondary is classified as...






49. How should clothing be removed from a burn?






50. The property of an electric circuit that opposes any change in current is called...







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