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1. (601) As applied to semiconductors, “forward bias” means a positive voltage is applied to
a. the P-type material while a negative voltage is applied to the N-type material.
2. (602) The resistance of a zener diode is lowest when it is
d. reverse biased above breakdown voltage.
3. (602) What is the essential difference between tunnel diodes and conventional PN junction diodes?
a. Amount of doping.
4. (603) The majority of current flow in a transistor that has both the emitter-base and collector-base circuits connected flows from the
a. emitter through the collector.
5. (603) Current flow is varied in a transistor by varying the bias in the
d. emitter-base junction.
6. (603) The transistor amplifier configuration which produces a 180° phase shift of the input signal is the grounded
c. emitter.
7. (604) Which device has two base leads?
d. Unijunction transistor.
8. (605) What are the key characteristics of field-effect transistors?
c. High input impedance, minimum transit time.
9. (605) The two main groups of metal-oxide semiconductor field-effect transistors (MOSFET) are
c. depletion and enhancement.
10. (606) What is the advantage of phototransistors over photodiodes?
c. Greater output current.
11. (606) What are the two basic types of optical coupled devices?
a. Optoisolator, optical interrupter.
12. (607) A DIAC cannot be turned off by
d. force commutation.
13. (607) Which semiconductor device is said to be controlled by its external circuitry?
d. PUT.
14. (608) What is the primary purpose of the closed loop OP AMP configuration?
d. Stability.
15. (608) Which OP AMP configuration provides a voltage gain of 1?
d. Voltage follower.
16. (609) Which number is the integral portion of the number 305.84 10 ?  
d. 305.
17. (609) What are the three important features of numbering systems?
a. Place value, a point, and a radix.
18. (609) What radix does the binary numbering system use?
b. Two.
19. (609) As an exponent increases by 1 in the binary system, the power
  c. doubles.
20. (609) Convert 0111 BCD to its decimal equivalent.
c. 7.
21. (610) Subtract 1010 2 from 101102 .  
c. 1100 2 .  
22. (610) Convert decimal 100 to binary.
d. 1100100 2 .  
23. (610) Decimal 62 10 is equal to binary  
a. 111110.
24. (611) The decimal equivalent of 54 8 is  
b. 44.
25. (611) Which number is the octal equivalent of binary 110011 2 ?  
b. 63 8 .  
26. (611) Which number is the octal equivalent of decimal 86 10 ?  
b. 126 8 .  
27. (612) The is the advantage of the hexadecimal number system over the binary system is the
c. hexadecimal number system requires fewer digits to represent numbers.
28. (612) In the hexadecimal numbering system, what is the position called that is to the left of the radix point?
b. Zero.
29. (612) Which number is the HEX equivalent of binary 101101000110?
a. X’B46’.
30. (612) Which number is the binary equivalent of HEX X’F14’?
b. 1111 0001 0100.  
31. (613) Which voltage level pair represents negative logic in a digital logic circuit?
a. Binary 1 = –10V; binary 0 = –5V.  
32. (613) With positive logic, what does a circle (negation symbol) on the output of a gate represent?
d. When activated, the output will be a low.  
33. (613) With positive logic, what is the minimum signal required to activate an OR gate?  
a. Any high input.  
34. (614) To produce a high output, an exclusive OR must have
c. only one high input.
35. (614) The three basic circuits used to develop the output for logic devices are the totem-pole, 3- state, and
c. open collector.
36. (615) What are flip-flops used for in digital circuitry?
c. Storage.
37. (615) Which device is considered to be asynchronous?
c. RS latch.
38. (615) Data input is enabled in the D flip-flop when the clock pulse is
c. in a logic low transition to logic high (rising edge).
39. (615) What is the first step in the TTL JK master-slave flip-flop sequence of operation?
b. Isolate the slave from the master.
40. (616) The storage capacity of a shift register is determined by the number of
b. flip-flops.
41. (616) Where is the serial data output taken on a serial-in/serial parallel-out register?
d. Q 4 .  
42. (616) A serial-in/serial parallel-out register knows to shift data out in parallel by a signal on the
a. PE input.
43. (616) What type of shift register is in use if one bit of information is transferred at each clock pulse?
a. Serial.
44. (617) In the Johnson 4-bit counter, the maximum output combinations are
b. 8.
45. (617) Synchronous operation of counters is provided by having all flip-flops
d. clocked simultaneously.
46. (617) When a clear pulse is sent to a down counter, it will
c. reset all outputs to highs.
47. (617) Entering a predetermined number into a counter to start the count is called
b. preload.
48. (618) An ADC whose input can be positive and negative is said to be
a. bipolar.
49. (618) ADC resolution is based on
b. input voltage range and the number of binary numbers it produces for an output.
50. (618) What is needed to bridge the gap between an ADC and a microprocessor bus system?
d. Programmable peripheral interface.
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