MTA HELPER EXAM 4612 QUESTION WITH CORRECT NSWER UPDATE

1. What instrument should be used to check the voltage at the motor terminals of an AC motor hooked up to a power distribution box?  
   - Answer: Voltmeter

2. What instrument should be used to measure the shaft diameter of a motor accurately to one thousandth of an inch?  
   - Answer: Micrometer

3. What instrument should be used to determine whether 25 Hz or 60 Hz is present in an electrical circuit?  
   - Answer: Frequency meter

4. What is the proper instrument to use to determine the diameter of the conductor of a piece of electric hookup wire?  
   - Answer: Wire gauge

5. What should be used to measure the amount of electrical power being used in a balanced three-phase circuit?  
   - Answer: Wattmeter

6. What instrument can be used to observe the electrical waveform at a given point in an electrical circuit?  
   - Answer: Oscilloscope

7. What is the proper instrument to use for measuring the width of a door?  
   - Answer: 6-foot folding ruler

8. What instrument should be used to accurately check the diameter of a one-inch hole with a tolerance of plus or minus 0.003 inches reamed in a steel block?  
   - Answer: Vernier Caliper

9. How many conductors are required to connect a three-phase delta-connected heater bank to an electric power panel board?  
   - Answer: 3

10. What wire size is most commonly used for branch lighting circuits in homes?  
    - Answer: #12 A.W.G.

11. When installing electrical circuits, what tool should be used to pull wire through a conduit?  
    - Answer: Snake

12. To light a 300 W lamp, which switches must be closed?  
    - Answer: X and Z

13. If switches W, X, Y, and Z are all closed suddenly, what will happen?  
    - Answer: The lamp will light and the motor will rotate

14. With 120 volts applied across a 10-ohm resistor, how many amps of current are drawn by the resistor?  
    - Answer: 12

15. What is the approximate current drawn by a 300 W lamp when lighted?  
    - Answer: 2.5 amps

16. Of the following materials, which is the best conductor of electricity?  
    - Answer: Copper

17. What is the sum of 6'6", 5'9", and 2'1 1/2"?  
    - Answer: 14'4 1/2"

18. What is the total length of electrical conduit that must be run for lengths of 14'6", 21'3", 6'0", and 22'9"?  
    - Answer: 64'6"

19. Of the following electrical devices, which one is not normally used in direct current electrical circuits?  
    - Answer: Transformer

20. How many 120-volt light bulbs should normally be connected in series across a 600-volt electric line?  
    - Answer: 3

21. Of the following motors, which one does not have any brushes?  
    - Answer: Squirrel cage induction

22. What instrument should be used to accurately measure the resistance of a 4700-ohm resistor?  
    - Answer: Ohmmeter

23. What instrument should be used to measure the current in an electric circuit?  
    - Answer: Ammeter

24. What instrument should be used to measure the insulation resistance of a rubber-covered electrical cable?  
    - Answer: Megger

25. What is the lowest voltage that a neon tester can detect?  
    - Answer: 80 volts

26. What is the best procedure to use when storing tools that are subject to rusting?  
    - Answer: Apply a light coating of oil to the tools

27. If 3 1/2-inch-long nails are required to nail wood framing members together, what nail size should be used?  
    - Answer: 16d

28. Of the four motors, which one can operate only on alternating current?  
    - Answer: Induction motor

29. What is the sum of 1/3 + 2/6 + 5/6?  
    - Answer: 1 17/30

30. What instrument should be used to measure the state of charge of a lead-acid storage battery?  
    - Answer: Hydrometer

31. If three 1 1/2-volt dry cell batteries are wired in series, what is the total voltage provided?  
    - Answer: 4.5 volts

32. Taking into account time-and-a-half payment for overtime over 40 hours, what is the gross pay of an employee who works 43 hours in a week at a rate of $10.68 per hour?  
    - Answer: $475.26

33. What is the sum of 0.365 + 3.941 + 10.676 + 0.784?  
    - Answer: 15.766

34. To transmit mechanical power between two rotating shafts at right angles to each other using two gears, what type of gears are used?  
    - Answer: Bevel

35. To properly ground the service electrical equipment in a building, where should the ground connection be made?  
    - Answer: The cold water line entering the building