Download Ch 5 Homework - ECM

ECM 204 Ch 5 Homework
True/False
Indicate whether the statement is true (T) or false(F). Place either T or F in the space provided.
____
1. A PC board must be handled under static-free conditions only.
a. True
b. False
____
2. The fundamental line frequently in the U.S. is 60 Hz.
a. True
b. False
____
3. Diodes are marked or shaped to indicate their anode and cathode.
a. True
b. False
____
4. Computer operation cannot be adversely affected by momentary power interruptions.
a. True
b. False
____
5. Heat sinks are devices that conduct and dissipate heat away from a component.
a. True
b. False
____
6. Static electricity discharge is a major cause of electronic failure.
a. True
b. False
____
7. A half-wave rectifier is a circuit containing a diode that permits only the negative half-cycle of the AC sine
wave to pass.
a. True
b. False
Multiple Choice
Identify the one choice that best completes the statement or answers the question and place your answer in the space
provided..
____
8. _____ voltage is temporary, undesirable voltage in an electrical circuit.
a. Transverse
c. Transparent
b. Transient
d. Translucent
____
9. A voltage sag is a ____ decrease below the normal rated line voltage.
a. 0%-5%
c. 10%+
b. 5%-10%
d. none of the above
____ 10. A(n) _____ is a solid-state control device that is programmed and reprogrammed to automatically control an
industrial process or machine.
a. I/O
c. CPU
b. PLC
d. PC
____ 11. A voltage swell is a ____ increase above the normal rated line voltage.
a. 0%
c. 10%+
b. 5%-10%
d. none of the above
____ 12. A ______ is a material that has little resistance and permits electrons to move through it easily.
a. conductor
c. resistor
b. semiconductor
d. none of the above
____ 13. ______-type material is material with empty spaces (holes) in its crystalline structure.
a. P
c. PN
b. N
d. NP
____ 14. A ____ rectifier is a circuit containing four diodes.
a. half-wave
c. bridge
b. full-wave
d. none of the above
____ 15. A ____ sensor is a device that reacts to the proximity of a target without physical contact.
a. manual
c. proximity
b. physical
d. thermal
____ 16. A _____ is a device that produces electricity when two different metals that are joined together are heated.
a. thermistor
c. triac
b. transducer
d. thermocouple
Short Answer
Use the following word bank to answer the completion questions. Be sure to copy and spell the word exactly
as it is listed.
solid-state
diode
relay
contact
inverter
leakage
phototransistor
LED
rectifier
holding
timer
PC
partial
transistor
open
17. A(n) _____ device is an electronic component such as a diode, SCR, transistor, or integrated circuit that
switches or controls the flow of current in a circuit.
18. A(n) _____ board is an insulating material such as fiberglass or phenolic with conducting paths laminated to
one or both sides of the board.
19. A(n) ____ is a diode that produces light when current flows through it.
20. A(n) ____ is an electrical component that converts AC to DC by allowing voltage and current to move in only
one direction.
21. A(n) ____ is a three-terminal device that controls current flow depending on the amount of voltage applied to
the base.
22. A(n) ____ is a device that controls one electrical circuit by opening and closing contacts in another circuit.
23. _____ current is the small amount of current flowing through a solid-state device when it is not conducting.
24. A(n) ____ is a control device that uses a preset time period as part of the control function.
25. A(n) ____ is a machine, device, or system that changes DC voltage into AC voltage and can be designed to
produce variable frequency.
26. A(n) _____ is an electronic component that allows current to pass in only one direction.
27. A(n) ____ fault is the malfunctioning of only a section or several sections of a machine.
28. ____ current is the minimum current required to keep an SCR conducting.
29. A(n) ____ is a device that combines the effect of a photodiode and the switching capability of a transistor.
ECM 204 Ch 5 Homework
Answer Section
TRUE/FALSE
1.
2.
3.
4.
5.
6.
7.
T
T
T
F
T
T
F
MULTIPLE CHOICE
8.
9.
10.
11.
12.
13.
14.
15.
16.
B
C
B
C
A
B
C
C
D
SHORT ANSWER
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
solid-state
PC
LED
rectifier
transistor
relay
Leakage
timer
inverter
diode
partial
Holding
phototransistor