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






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






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






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






5. 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?






6. Where should grounding resistors be located?






7. 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...






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






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






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






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






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






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






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






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






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






17. The main function of CT's and PT's on a main substation is to...






18. A 3-phase - 2 speed - constant torque motor is running at fast speed. The motor windings are connected wye for fast speed. Motor leads T4 - T5 and T6 are connected to the line leads. Motor leads T1 - T2 and T3 should be...






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






20. A control power transformer...






21. What is the danger when working around capacitors?






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






23. 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.






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






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






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






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






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






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






30. The transformer used only to measure voltage is a...






31. Alternating current may be defined as...






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






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






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






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






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






37. 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?






38. 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?






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






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

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41. 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?






42. A transformer has a primary voltage of 2 -400 volts and a secondary reading of 120 volts. If there are 1 -500 turns on the primary - how many turns are on the secondary?






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






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






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






46. 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?






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






48. 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.






49. 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...






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