Digital Electronics

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Q. What is the main difference between synchronous and asynchronous counters?
  • A. Synchronous counters count faster
  • B. Asynchronous counters have a delay
  • C. Synchronous counters are simpler
  • D. Asynchronous counters are more accurate
Q. What is the main disadvantage of using CMOS logic?
  • A. High power consumption
  • B. Complex design
  • C. Susceptibility to noise
  • D. Slower than TTL
Q. What is the main function of a fuse in a programmable logic device?
  • A. To store data
  • B. To connect logic gates
  • C. To provide power
  • D. To reset the device
Q. What is the main purpose of a decoder in digital circuits?
  • A. To convert binary data to decimal
  • B. To select specific outputs based on input combinations
  • C. To perform arithmetic operations
  • D. To store data
Q. What is the main purpose of using pull-up resistors in TTL circuits?
  • A. To increase speed
  • B. To ensure a defined logic level
  • C. To reduce power consumption
  • D. To improve noise immunity
Q. What is the maximum capacity of a standard DVD?
  • A. 4.7 GB
  • B. 8.5 GB
  • C. 25 GB
  • D. 50 GB
Q. What is the maximum clock frequency of the 8051 microcontroller?
  • A. 1 MHz
  • B. 12 MHz
  • C. 24 MHz
  • D. 40 MHz
Q. What is the maximum output current of a standard 555 timer?
  • A. 10 mA
  • B. 20 mA
  • C. 200 mA
  • D. 500 mA
Q. What is the maximum theoretical capacity of a single-layer DVD?
  • A. 4.7 GB
  • B. 8.5 GB
  • C. 25 GB
  • D. 50 GB
Q. What is the Nyquist theorem related to?
  • A. The maximum frequency of a signal
  • B. The minimum sampling rate to avoid aliasing
  • C. The bandwidth of a digital filter
  • D. The energy of a signal
Q. What is the octal representation of the decimal number 8?
  • A. 10
  • B. 11
  • C. 12
  • D. 20
Q. What is the output of a 2-bit binary adder for inputs 11 and 01?
  • A. 00
  • B. 10
  • C. 11
  • D. 100
Q. What is the output of a 2-bit binary counter after three clock pulses?
  • A. 00
  • B. 01
  • C. 10
  • D. 11
Q. What is the output of a 2-input AND gate when both inputs are high?
  • A. 0
  • B. 1
  • C. Undefined
  • D. Both 0 and 1
Q. What is the output of a 2-input AND gate when both inputs are true?
  • A. 0
  • B. 1
  • C. undefined
  • D. false
Q. What is the output of a 2-input NAND gate when both inputs are low?
  • A. 0
  • B. 1
  • C. Undefined
  • D. Depends on the circuit
Q. What is the output of a 2-input NOR gate when both inputs are high?
  • A. 0
  • B. 1
  • C. Both 0 and 1
  • D. Undefined
Q. What is the output of a 2-input NOR gate when both inputs are low?
  • A. 0
  • B. 1
  • C. Undefined
  • D. Depends on the circuit
Q. What is the output of a 2-input OR gate when one input is low and the other is high?
  • A. 0
  • B. 1
  • C. Both 0 and 1
  • D. Undefined
Q. What is the output of a 2-input XOR gate when both inputs are the same?
  • A. 0
  • B. 1
  • C. Undefined
  • D. Depends on the circuit
Q. What is the output of a 2-to-1 multiplexer if the inputs are A=0, B=1 and the select line is 0?
  • A. 0
  • B. 1
  • C. Undefined
  • D. Both 0 and 1
Q. What is the output of a 3-bit counter after 5 clock pulses?
  • A. 000
  • B. 101
  • C. 011
  • D. 111
Q. What is the output of a 3-input XOR gate when all inputs are high?
  • A. 0
  • B. 1
  • C. Undefined
  • D. Both 0 and 1
Q. What is the output of a 4-to-1 multiplexer if the inputs are A=0, B=1, C=0, D=1 and the select lines are S0=1, S1=0?
  • A. 0
  • B. 1
  • C. 1
  • D. 0
Q. What is the output of a binary to BCD converter for the binary input 10010?
  • A. 0010
  • B. 0001 0010
  • C. 0001 0000
  • D. 0011
Q. What is the output of a binary to BCD converter for the binary input 1001?
  • A. 0001 0001
  • B. 0000 1001
  • C. 0000 0001
  • D. 0000 1000
Q. What is the output of a binary to gray code converter for the binary input 1011?
  • A. 1110
  • B. 1100
  • C. 1001
  • D. 1010
Q. What is the output of a D Flip-Flop when the D input is low and the clock signal transitions?
  • A. High
  • B. Low
  • C. Toggle
  • D. Undefined
Q. What is the output of a decimal to binary converter for the decimal number 10?
  • A. 1010
  • B. 1001
  • C. 1100
  • D. 1110
Q. What is the output of a NAND gate if both inputs are 1?
  • A. 0
  • B. 1
  • C. undefined
  • D. error
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