93011
1. An important safety precaution you should take before starting any electrical servicing job is to make sure that your
A. tools are unbreakable.
B. fingers are not oily.
C. body is not grounded.
D. clothing is not moist.
2. Before you touch a wire in an appliance, how should you make sure that it is NOT energized?
A. By plugging in the line cord and closing the appliance switch
B. By checking for voltage with a neon tester
C. By touching the grounded and black wires and watching for a spark
D. By testing for leakage with an ohmmeter
3. A soldering iron used for electrical repair jobs will work properly if its tip is
A. covered with flux before being heated.
B. clean and tinned with melted solder
C. oxidized and coated with solder.
D. made smooth with a file.
4. Your workbench should be made of
A. steel, for strength.
B. aluminum, for light weight
C. plastic, for low cost
D. wood, for insulation
5. The recommended flux for electrical soldering is
A. antimony.
B. muriatic acid
C. sal ammoniac
D. rosin
6. For home service calls, the ideal soldering tool is a(n)
A. soldering gun.
B. soldering iron
C. gas torch
D. alcohol torch
7. Which one of the following tin-lead soldiers has the lowest melting point?
A. 40/60
B. 50/50
C. 60/40
D. 70/30
8. A properly made and cooled solder joint will have the solder
A. formed in balls.
B. covered with flux.
C. with a slightly frosted appearance
D. with a mirror like surface
9. Side-cutters or diagonal cutting pliers should be used to cut
A. bolts.
B. nails.
C. wire
D. screws
10. Which one of the following items should always be used to cover the tang at the end of a file before you use the file?
A. Rag
B. Pliers
C. Handle
D. File card
11. Which one of the following tools can be used to cut external threads on bolts or rods?
A. Tap
B. Die
C. Reamer
D. Screw extractor
12. How much current can a 12-gauge copper wire carry?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
13. When measuring current, always place any type of meter in
A. series with the circuit.
B. the OHMS position
C. the LEAKAGE position.
D. a parallel position to the circuit
14. Your customer has connected a 1000-watt microwave oven and a 600-watt mixer to a 15-amp branch service line for the kitchen. What is the actual current draw, and will the circuit breaker trip if these are the only loads in that line?
A. 16.00 amps, No
B. 16.00 amps, Yes
C. 14.24 amps, No
D. 14.24 amps, Yes
15. When measuring an unknown voltage with an analog VOM, you should first
A. set the switch to the lowest range and then move it to a higher range until you get an accurate reading.
B. set the switch to the highest range and then move it to a range that gives the most accurate reading.
C. ground the meter.
D. ground the circuit.
16. How should you set the OHMS ADJust control on a multitester of analog VOM, for resistance measurements?
A. By rotating the OHMS ADJust knob until the pointer is set over 0 volts, without shorting the test leads
B. By rotating the OHMS ADJust knob until the pointer is set over 0 ohms, without shorting the test leads
C. By shorting the test leads and rotating the OHMS ADJust knob until the pointer indicates 0 volts
D. By shorting the test leads and rotating the OHMS ADJust knob until the pointer indicates 0 ohms
17. The lamp recommended for testing the output of battery-recharging devices for cordless appliances is the
A. radio pilot lamp.
B. neon test lamp
C. automobile head lamp.
D. incandescent test lamp
18. The two types of scales that are printed on the meter face of an analog VOM are
A. positive and negative scales.
B. linear and non-linear scales
C. polarized and non-polarized scales.
D. single and double scales
19. The most accurate readings that you can take on an analog VOM are when the meter's pointer is at the
A. extreme right
B. near right
C. extreme left.
D. center scale
20. Which one of the following analog VOM ranges would be selected to measure a DC current of 90 milliamps?
A. 10A
B. 1.0A
C. 100mA
D. 10mA
21. What type of accessory device can be used to measure AC current with a VOM without opening the circuit?
A. Isolation transformer
B. Amp clamp
C. Split inductor
D. Amp coupler
22. If you make a mistake in polarity when measuring the value of DC voltage in a circuit with a digital VOM, what will happen?
A. The meter will be damaged.
B. The meter will read positive voltage only.
C. The meter will display a negative sign
D. The meter will display OL which states an overload condition.
23. The one disadvantage of a digital VOM is
A. difficulty in reading the LCD display.
B. long scan times sometimes miss quickly changing signals.
C. number flickering in the presence of motors or relays
D. large battery drainage to power display elements.
24. Which one of the following oscilloscope controls is used to move the trace up and down the screen vertically?
A. Position
B. Focus
C. Intensity
D. Sweep speed
25. The horizontal sweep of an oscilloscope is rated in
A. Volts/division
B. Amps/division
C. Seconds/division
D. Ohms/division