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






2. What type of 3-phase AC motor is used most often around a mine?






3. The most reliable method to use to determine whether or not the heart has stopped is by checking the...

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






5. 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?






6. When connecting 3 single-phase transformers into a three-phase system - which of the following is NOT required for the single-phase transformers.






7. If a voltmeter were placed between two phase leads of a three-phase 480-volt system - the meter would read...






8. The minimum allowable size for trailing cables for mobile haulage equipment powered by alternating current is...






9. The neutral ground-bed electrical power system of an underground mine should be separated from the lightning arrestor grounds by at least...






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






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






12. 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.






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






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






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






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






17. How can you tell if a victim receiving mouth-to-mouth resuscitation is getting air into the lungs?






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






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






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






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






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






23. At what rate should mouth-to-mouth resuscitation be applied?






24. AC voltage is raised or lowered by means of...






25. Current in an AC circuit may be measured by...






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






27. Surface transformer installations - unless constructed to eliminate shock hazards - must be installed at least...






28. The following motor leads are brought out of a 3-phase motor (T1 - T2 - T3 - T4 - T5 - T6). This motor is probably for...






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






30. Define alternating current...






31. What is the first step to be followed in aiding a victim of electrical shock?






32. 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?






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






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






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






36. Not a symptom of electrical shock?.






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






38. Compared to the secondary of a loaded - step-down transformer - the primary has...






39. 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.






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






41. What is a capacitor?






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






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






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






45. Should a ground fault occur - what device can be installed to limit the current in the neutral of a three-phase AC system?






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






47. What should the duty rating of a grounding resistor be?






48. 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...






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






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