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. A solenoid coil is...






2. Alternating current may be defined as...






3. 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?






4. 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...






5. What position of a selector switch using a voltmeter would you select to check a 120-volt AC circuit to obtain the most accurate reading?






6. A wound-rotor induction motor has all the following EXCEPT...






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






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






9. 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?






10. 460 volts AC is required to operate two motors - one connected in single-phase and the other connected in three-phase. The three-phase motor will...






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






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






13. A control power transformer...






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






15. The purpose of a zig-zag transformer is to...






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






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






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






19. If current were flowing through a grounding resistor in a 440-volt - resistance-grounded system - this would probably be because...






20. 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?






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






22. What is the danger when working around capacitors?






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






24. A transformer with 1 -500 turns in the primary winding has a primary voltage of 2 -400 volts and a secondary voltage of 120 volts. How many turns are in the secondary winding?






25. What steps up or steps down AC voltage?






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






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






28. 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...






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






30. How do you change the direction of a 3-phase AC motor?






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






32. Which of the following is not needed when using an ohmmeter to determine if a motor is grounded?






33. Using a 10:1 ratio transformer - the terminals on the secondary side or lower voltage side would be marked...






34. Not a symptom of electrical shock?.






35. Not true about AC power?






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






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






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






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






40. The standard frequency of power supplied by the power company is...






41. 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?






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






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






44. 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?






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






46. Define alternating current...






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






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






49. If 2000 watts is read in the primary of a single-phase transformer - What is the wattage in the secondary? (Assuming no losses.)






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







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