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September 20, 2014

Homework Help: NEED HELP ELECTRONICS

Posted by Ron on Thursday, July 19, 2012 at 9:47pm.

2. Two electronics technicians are looking at the technical manual for a piece of electronic equipment. The
manual refers to a particular resistor as a “2.2 megohm resistor.” Technician A says that this means that the
resistance value of the resistor is 22,000 ohms. Technician B says that this means that the resistor can
safely carry a current of 2,200,000 amperes. Which of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct.
3. Two electronics technicians are discussing electronic components. Technician A says that electronic components are color-coded to indicate their electrical values. Technician B says that electronic components
are color-coded to indicate their power ratings. Which of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct
B. Only Technician B is correct. D. Neither of the two technicians is correct. 4. Figure A-1 shows two pith balls suspended by threads from a support. In the figure,
A. the pith balls are uncharged.
B. pith ball 1 is positively charged, and pith ball 2 is negatively charged.
C. pith balls 1 and 2 have the same charge.
D. pith ball 1 is negatively charged, and pith ball 2 is positively charged.
5. What would happen if the two pith balls shown in Figure A-1 were held together for a few moments, then
released?
A. The charge would leak off and the pith balls would hang straight down.
B. The pith balls would each receive a negative charge and they would move apart.
C. The charge would cause the pith balls to stick together.
D. The pith balls would each receive a positive charge and they would move apart.
6. Two electronics technicians are looking at the piece of testing equipment shown in Figure A-2. Technician A
says that this piece of equipment is called a digital multimeter. Technician B says that this piece of equipment is substituted for the power conversion circuits inside a piece of equipment that’s being tested. Which
of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct.7. Two electronics technicians are discussing electrical quantities. Technician A says that resistance is an
opposition to electrical power and voltage is electrical pressure. Technician B says that current is the rate of
electrical flow in a circuit and voltage is the opposition to current flow. Which of the following statements is
correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct.
8. Look at the resistor illustrated in Figure A-3. Based on your knowledge of the resistor color code, what are
the resistance value and tolerance of this resistor?
A. 7.9 k 10% C. 92 k 20%
B. 63 k 5% D. 124 k 5%
9. Two electronics technicians are looking at the representations of a silver atom and a copper atom in Figure
A-4. Technician A says that silver and copper are both good conductors because their atoms have single
electrons in their outermost orbits. Technician B says that silver is a better conductor than copper because
the silver atom’s free electron is farther from its nucleus than the copper atom’s free electron is from its nucleus. Which of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct. 10. Two electronics technicians are discussing conductors and insulators. Technician A says that conductors
have more free electrons than insulators. Technician B says that insulators have lower resistance than conductors. Which of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct.
11. Look at the four schematic symbols shown in Figure A-5. Each of the symbols is labeled with a number.
Which of the following statements about these symbols is correct?
A. Symbol 1 represents a battery, symbol 2 represents a lightbulb, symbol 3 represents a fuse, and
symbol 4 represents a relay coil.
B. Symbol 1 represents a fuse, symbol 2 represents a fixed resistor, symbol 3 represents a battery, and
symbol 4 represents an SPST switch.
C. Symbol 1 represents a wire connection, symbol 2 represents a battery, symbol 3 represents a variable
resistor, and symbol 4 represents a fuse.
D. Symbol 1 represents a fixed resistor, symbol 2 represents a fuse, symbol 3 represents a relay coil, and
symbol 4 represents a lightbulb.
12. Two electronics technicians are looking at the testing instrument in Figure A-6. Technician A says that this
instrument is used to measure electrical signals in a circuit and display them as waveforms on a screen.
Technician B says that this instrument is called a signal generator. Which of the following statements is
correct?
A. Only Technician A is correct.
B. Both Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither of the two technicians is correct. 13. Two electronics students are discussing electrical units. Student A says that electrical power is measured in
units called coulombs. Student B says that the abbreviation 400 k stands for 400,000 volts. Which of the
following statements is correct?
A. Only Student A is correct. C. Both of the students are correct.
B. Only Student B is correct. D. Neither of the two students is correct.
14. Look at the resistor illustrated in Figure A-7. Based on your knowledge of the resistor color code, what are
the resistance value and tolerance of this resistor?
A. 1.5 k 10% C. 30 k 10%
B. 2.7 k 5% D. 525 k 20%
15. Two electronics technicians are measuring electrical quantities in circuits. Technician A says that copper,
glass, porcelain, and carbon are all examples of resistors. Technician B says that when the resistance in a
circuit is increased, the current flow will decrease. Which of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct.
16. You observe a small plaque on an electrical appliance that reads, in part, “115 volts AC 60 Hz.” This means
that the appliance
A. contains a heating element.
B. must be operated on alternating current.
C. may be operated with batteries.
D. produces special safety hazards.17. Two electronics technicians are discussing the electric series. Technician A says that if you rub a piece of
glass with a piece of wool cloth, the glass will receive a negative charge. Technician B says that if you rub a
piece of aluminum with a piece of flannel, the aluminum will receive a negative charge. Which of the following statements is correct?
A. Only Technician A is correct. C. Both Technician A and Technician B are correct.
B. Only Technician B is correct. D. Neither of the two technicians is correct.
Examination 25
FIGURE A-7—Use this
illustration to answer
Question 14.18. Figure A-8 shows two pith balls suspended by threads from a support. In the figure,
A. the pith balls are uncharged, so they hang straight down.
B. pith ball 1 is positively charged, and pith ball 2 is negatively charged.
C. the pith balls both have the a positive charge, so they hang straignt down.
D. pith ball 1 is negatively charged, and pith ball 2 is positively charged.19. Two electronics students are converting values into scientific notation. Student A says that the number
29,000 is expressed as 2.9 x 10
4
in scientific notation. Student B says that the number 0.089 is expressed
as 8.9 x 10
-2
in scientific notation. Which of the following statements is correct?
A. Only Student A is correct. C. Both of the students are correct.
B. Only Student B is correct. D. Neither of the two students is correct.
20. Look at the resistor illustrated in Figure A-9. Based on your knowlwdge of the resistor color code, what are
the resistance value and tolerance of this resistor?
A. 3.8 k 20% C. 126 k 10%
B. 42 k 5% D. 270 k 5%

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