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ECE Objective Questions { Digital Circuit and Microprocessor }



72. BCD code is
A. non-weighted
B. the same thing as binary numbers
C. a binary code
D. an alphanumeric code

73. Which of the following 4-bit combinations is/are invalid in the BCD code?
A.1010
B.10
C.101
D.1000

74. Octal coding involves grouping the bits in
A. 5's
B. 7's
C. 4's
D. 3's

75. In Excess-3 code each coded number is than in BCD code.
A. four larger
B. three smaller
C. three larger
D. much larger

76. Which numbering system uses numbers and letters as symbols?
A. decimal
B. binary
C. octal
D. hexadecimal

77. To convert a whole decimal number into a hexadecimal equivalent, one should divide the decimal value by
A.2
B.8
C.10
D.16

78. A logic gate is an electronic circuit which
A. makes logic decision
B. allows electron flow only in one direction
C. works on binary algebra
D. alternates between 0 and 1 values

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