Digital Electronics

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Q. In a full adder, how many inputs does it have?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. In a half adder, what does the sum output represent?
  • A. Carry out
  • B. Logical AND
  • C. Logical OR
  • D. XOR of inputs
Q. In a monostable 555 timer circuit, what happens when the trigger pin is activated?
  • A. The output goes high for a short duration
  • B. The output remains low
  • C. The output oscillates
  • D. The timer resets
Q. In a monostable 555 timer, what determines the duration of the output pulse?
  • A. The supply voltage
  • B. The value of the timing resistor and capacitor
  • C. The trigger signal duration
  • D. The output load
Q. In a multiplexer, what is the role of the select lines?
  • A. To determine the output based on input values
  • B. To store data
  • C. To provide power
  • D. To control timing
Q. In a ring counter, how many states does it have if it has 4 flip-flops?
  • A. 4
  • B. 8
  • C. 16
  • D. 2
Q. In a serial-in parallel-out shift register, how is data entered?
  • A. All at once
  • B. One bit at a time
  • C. In groups of four
  • D. In reverse order
Q. In a shift register, what does the term 'clock pulse' refer to?
  • A. The speed of data transfer
  • B. The timing signal that controls shifting
  • C. The amount of data stored
  • D. The type of shift register
Q. In a T Flip-Flop, what does the T input control?
  • A. The output state
  • B. The clock frequency
  • C. The reset condition
  • D. The data input
Q. In a truth table, how many rows are there for a circuit with 3 inputs?
  • A. 4
  • B. 6
  • C. 8
  • D. 16
Q. In a truth table, how many rows does a 3-input logic gate have?
  • A. 4
  • B. 6
  • C. 8
  • D. 16
Q. In an astable multivibrator, what determines the frequency of oscillation?
  • A. The resistor values only
  • B. The capacitor value only
  • C. Both resistor and capacitor values
  • D. The power supply voltage
Q. In an integrated circuit, what does the term 'die' refer to?
  • A. The entire circuit board
  • B. The individual chip of silicon
  • C. The packaging of the IC
  • D. The power supply
Q. In an MSI circuit, what is the typical number of gates integrated?
  • A. 1-10
  • B. 10-100
  • C. 100-1000
  • D. 1000-10000
Q. In an SR Flip-Flop, what condition is considered invalid?
  • A. S=0, R=0
  • B. S=1, R=0
  • C. S=0, R=1
  • D. S=1, R=1
Q. In an SR flip-flop, what condition leads to an invalid state?
  • A. S=0, R=0
  • B. S=1, R=0
  • C. S=0, R=1
  • D. S=1, R=1
Q. In astable mode, how many output states does a 555 timer have?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. In digital circuits, what does the term 'logic level' refer to?
  • A. Voltage levels
  • B. Frequency levels
  • C. Temperature levels
  • D. Current levels
Q. In digital circuits, what does the term 'two's complement' refer to?
  • A. A method for binary addition
  • B. A method for binary subtraction
  • C. A way to represent negative numbers
  • D. A type of logic gate
Q. In digital design, what does FPGA stand for?
  • A. Field Programmable Gate Array
  • B. Fast Programmable Gate Array
  • C. Field Programmable General Array
  • D. Fixed Programmable Gate Array
Q. In digital signal processing, what is aliasing?
  • A. Loss of data during transmission
  • B. Distortion that occurs when a signal is undersampled
  • C. The process of converting digital to analog
  • D. A method of noise reduction
Q. In HDL, what does the term 'sensitivity list' refer to?
  • A. A list of variables to be optimized
  • B. A list of signals that trigger an event
  • C. A list of modules in a design
  • D. A list of test cases
Q. In interfacing, what does PWM stand for?
  • A. Pulse Width Modulation
  • B. Pulse Wave Measurement
  • C. Phase Width Modulation
  • D. Pulse Wave Modulation
Q. In MSI circuits, what does the term 'fan-out' refer to?
  • A. Number of inputs
  • B. Number of outputs a gate can drive
  • C. Power consumption
  • D. Size of the circuit
Q. In the context of DSP, what does FFT stand for?
  • A. Fast Fourier Transform
  • B. Frequency Filter Technique
  • C. Fast Filter Transform
  • D. Fourier Frequency Transform
Q. In the context of DSP, what does the term 'windowing' refer to?
  • A. The process of filtering a signal
  • B. The technique of segmenting a signal for analysis
  • C. The conversion of a signal from analog to digital
  • D. The adjustment of signal amplitude
Q. In Verilog, which keyword is used to define a module?
  • A. define
  • B. module
  • C. entity
  • D. architecture
Q. In Verilog, which operator is used for bitwise AND?
  • A. &&
  • B. &
  • C.
  • D.
  • . ^
Q. In VHDL, which keyword is used to define a new entity?
  • A. component
  • B. entity
  • C. architecture
  • D. signal
Q. In which logic family is the output state determined by the input states without any delay?
  • A. TTL
  • B. CMOS
  • C. Static Logic
  • D. Dynamic Logic
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