Code Converts and Multiplexers Questions and Answers

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Q1
In a Gray code, each number is 3 greater than the binary representation of that number.
  • A TRUE
  • B FALSE
Answer: Option B
Q2
Use the weighting factors to convert the following BCD numbers to binary. 0101 0011        0010 0110 1000
  • A 01010011 001001101000
  • B 11010100 100001100000
  • C 110101 100001100
  • D 101011 001100001
Answer: Option C
Q3
Which digital system translates coded characters into a more useful form?
  • A encoder
  • B display
  • C counter
  • D decoder
Answer: Option D
Q4
From the following list of input conditions, determine the state of the five output leads on a 74148 octal-to-binary encoder. I0 = 1     I3 = 1     I6 = 1 I1 = 1     I4 = 0     I7 = 1 I2 = 1     I5 = 1     EI = 0
  • A GS = L, A0 = L, A1 = L, A2 = H, EO = H
  • B GS = L, A0 = H, A1 = L, A2 = L, EO = H
  • C GS = L, A0 = L, A1 = H, A2 = L, EO = H
  • D GS = L, A0 = H, A1 = H, A2 = L, EO = H
Answer: Option D
Q5
What is the function of an enable input on a multiplexer chip?
  • A to apply Vcc
  • B to connect ground
  • C to active the entire chip
  • D to active one half of the chip
Answer: Option C
Q6
The expansion inputs to a comparator are used for expansion to a(n):
  • A 4-bit system
  • B 8-bit system
  • C BCD system
  • D counter system
Answer: Option B
Q7
What do the mathematical symbols A < b and A > B mean?
  • A A < B means A is greater than B. A > B means A is less than B.
  • B A > B means A is less than B. A < B means A is greater than B.
  • C A < B means A is less than B. A > B means A is greater than B.
Answer: Option C
Q8
A basic multiplexer principle can be demonstrated through the use of a:
  • A single-pole relay
  • B DPDT switch
  • C rotary switch
  • D linear stepper
Answer: Option C
Q9
How many inputs will a decimal-to-BCD encoder have?
  • A 4
  • B 8
  • C 10
  • D 16
Answer: Option C
Q10
A principle regarding most IC decoders is that when the correct input is present, the related output will switch:
  • A active-HIGH
  • B to a high impedance
  • C to an open
  • D active-LOW
Answer: Option D

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