Appendix B: Test
TEST - ELECTRICAL CIRCUITS AND MEASUREMENTS CLASS Revised Oct 26 1999 Name:______________________________________ Topic 1: Terms & Concepts 1. Pressure in a water system is equivalent to ----- in an electrical system. A. voltage B. resistance C. current D. power 2. Flow in a water system is equivalent to ----- in an electrical system. A. voltage B. resistance C. current D. power 3. A flow restriction in a water system is equivalent to ----- in an electrical system. A. voltage B. resistance C. current D. power 4. What is the power (P) in a circuit with a current (I) of 10 Amps and a voltage (E) of 20 Volts? A. 30 Watts B. 200 Watts C. 10 Watts D. 2 Watts 5. What is the voltage (E) in a circuit with a current (I) of 20 Amps and a resistance (R) of 40 Ohms? A. 0.5 volts B. 2 volts C. 60 volts D. 800 volts 6. What is the current (I) in a circuit with a voltage (E) of 100 volts and a resistance (R) of 5 Ohms? A. 0.2 Amps B. 20 Amps C. 105 Amps D. 500 Amps 7. Suppose a NESLAB bath is rated for 1200 Watts cooling capacity, and we want to test it. We run it and apply exactly 1200 Watts to the bath water using an electric heater. The temperature of the bath slowly falls. What do you know about the bath? A. It cannot maintain a constant temperature so it fails the test. B. Its capacity is less than 1200 Watts so it fails the test. C. Its capacity is more than 1200 Watts so it passes the test. D. Its capacity is exactly 1200 Watts so it passes the test. Topic 2: Components 8. The abbreviation SPDT means... A. Single Position, Double Throw B. Single Pole, Double Throw C. Single Pole, Double Terminal D. Single Position, Double Terminal 9. What device could be used to change 120V AC to 240V AC? A. solenoid coil B. transformer C. relay D. switch 10. What part of a transformer is connected to the energy source? A. primary winding B. secondary winding C. ground D. center-tap 11. If a relay is unpowered, there is a path between which terminals? A. normally closed and common B. normally open and common C. coil and common D. normally open and normally closed 12. If you have a 120 volt supply and you want to obtain 24 volts, what could you use? A. Step-up transformer B. Step-down transformer C. Center-tapped transformer D. Contactor 13. What determines which way a single-phase motor rotates? A. They always rotate clockwise. B. They always rotate counter-clockwise. C. It depends how the capacitor is wired. D. It doesn't matter which way they rotate. 14. What can you do if a three-phase motor is turning backwards? A. Reverse any one wire end-to-end B. Reverse any two of the three wires (not counting the ground wire) C. Check the "rotation direction" switch on the motor D. Reverse the capacitor wires Topic 3: Wiring Diagrams 15. The Revision Block on a diagram says a certain revision occured in zone B-3. What does this mean? A. It is the zone where the particular drafter sits B. It is the wiring zone inside the unit C. It locates the general area on the wiring diagram, like a road map D. It locates the title block on the wiring diagram 16. Where can you look on a wiring diagram to find the part number for Fuse "4FU"? A. Revision block B. Parts block C. Title block D. It should be right where 4FU is drawn 17. The Title Block on your wiring diagram says the "rev" is "C". The Bill of Materials says the rev is "D". What is the story? A. The diagram has a lower rev letter, so it is newer. Use it. B. The diagram has a higher rev letter, so it is newer. Use it. C. The diagram is outdated. Discard it and go get rev "D". D. The Bill of Materials is wrong. Ignore it. 18. A wire on the diagram is labelled 1L2 BLK #10. What can you tell about this wire? A. It carries line voltage, comes from terminal L2, is black, and #10 AWG. B. It carries line voltage, comes from terminal 1L, is black, and #10 AWG. C. It carries low voltage, comes from terminal L2, is black, and is wire #10 in the wire kit. D. It carries low voltage, comes from terminal block 1L2, and #10 AWG. 19. A contactor has terminals labelled L1, L2, L3 and T1, T2, and T3. How do you wire it? A. L1, L2, L3 go to Line. T1, T2, T3 go to the load. B. T1, T2, T3 go to Line. L1, L2, L3 go to the load. C. L1, T1 go to Line. L2, T2 go to load. L3, T3 go to ground. D. L1, T1 go to Load. L2, T2 go to line. L3, T3 go to ground. 20. Your diagram calls for a relay with two common terminals. What kind of relay could you use? A. SPST B. DPST or DPDT C. SPDT D. any relay with two coils 21. This symbolindicates: A. flow sensing switch, wired to open on rise B. flow sensing switch, wired to close on rise C. level sensing switch, wired to open on rise D. level sensing switch, wired to close on rise 22. This symbol
indicates: A. flow sensing switch, wired to open on rise B. flow sensing switch, wired to close on rise C. level sensing switch, wired to open on rise D. level sensing switch, wired to close on rise Topic 4: Safety 23. What is the usual path for electricity in a 115 volt device? A. Comes in the neutral, goes out the hot wire. B. Comes in the hot, goes out the neutral wire. C. Comes the hot, goes out the ground wire. D. Comes in the neutral, goes out the ground wire. 24. The worst situation to receive an electrical shock is: A. In one finger, out the next finger B. In one hand, out the elbow on the same arm C. In one hand, out the other D. In one hand, out the foot on the same side 25. What protects you against electrical shock? A. a fuse B. a circuit breaker C. A GFCI (ground fault current interrupter) D. a RESET button on the circuit breaker 26. If you received a shock above the let-go current level, what would happen? A. You could still let go of the conductor B. You could not let go of the conductor C. You need both hands to let go of the conductor D. You can only let go of one hand at a time 27. Why should we be extra careful around soaps and detergents? A. Dirt is a good insulator. Clean skin is more likely to receive a dangerous shock. B. Soaps and detergents store electricity, like a capacitor. C. Soaps and detergents insulate us from ground D. Soaps and detergents allow our skin to absorb more water, making any shock more dangerous 28. Which of these is a reaction injury? A. You are startled by a spark, pull your hand back, cut it on a sharp edge. B. You get a flu shot and have an allergic reaction to it. C. You are startled by a spark, and jump back. D. Your fingers get across a capacitor and get a small shock from it. 29. Why are capacitors dangerous? A. They can store electricity, even when disconnected from a circuit B. They can store electricity, only while connected to a circuit C. They can multiply voltage D. They contain a hazardous chemical which can leak out 30. Can you get a shock from a tool plugged into a GFCI (Ground Fault Current Interrupter) ? A. No, never. B. Yes, but the GFCI limits the shock so it won't be hazardous C. Only if the GFCI is defective D. Only if the tool is not grounded Topic 5: Instruments & Measurements 31. What happens if you overload a multimeter? A. The circuit breaker will trip B. The GFCI will trip C. The fuse in the multimeter will blow D. Nothing, they're designed to take it 32. The symbol
on a multimeter means A. AC B. DC, constant only C. DC, pulsating only D. DC, constant or pulsating 33. You measure the DC voltage at your car battery, and the multimeter says it is -12 volts. How can this be? A. That's correct. B. The meter leads may be in the wrong jacks. C. The battery in the multimeter is installed backwards. D. Wrong method. Car batteries are AC. 34. You want to measure a current which is around 23 Amps. Your multimeter says 15 Amps maximum. What do you do? A. Use it anyway, they are good for double the rating. B. Use a clamp-on ammeter instead. C. Use it anyway, just switch it to the highest range. D. Use a transformer to drop the 23 Amps to less than 15 Amps first. 35. How do measure current using a clamp-on ammeter? A. Use two test leads to touch the terminals. B. Open the clamp, put it around a wire, leave the clamp open to read current. C. Open the clamp, put it around a wire, close the clamp to read current. D. You can't measure current with a clamp-on ammeter. 36. You measure current on the three wires supplying power to a HX-750. You read 10 amps, 7 amps, and 7 amps. What can you say about this unit? A. It is a balanced load B. It is an unbalanced load. C. The total current is 24 amps. D. It is defective. Topic 6: ESD 37. If a material conducts electricity slowly, it is called: A. conductive B. dissipative C. anti-static D. insulative 38. If a circuit board arrives in a pink bag, the pink bag is: A. conductive B. dissipative C. anti-static D. resistive 39. When should you NEVER wear a wrist strap? A. When working on an energized circuit of less than 100 volts B. When working on an energized circuit of more than 100 volts C. When removing a circuit board from a dissipative bag D. When moving a circuit board to another location 40. If you encounter a situation where you are unsure if you should be wearing a wrist strap or not. No one is around to ask advice. What should you do? A. Wear it anyway B. Don't wear it C. Wear it on the opposite wrist than usual D. Wear one on each wrist END OF TEST