Digital logic circuits and components: logic gates, Boolean algebra, map simplifications, combinational and sequential circuits, flip-flops, registers and counters, memory unit. - Online Test

30:00

1. Which logic gate produces an output of 1 only if all of its inputs are 1?

A) OR gate B) AND gate C) NOT gate D) XOR gate

2. What is the Boolean expression for an OR gate with inputs A and B?

A) A + B B) A . B C) A' D) A XOR B

3. The NOT gate is also known as an inverter because it:

A) Outputs the same as the input B) Outputs the complement of the input C) Outputs 1 if any input is 1 D) Outputs 0 if any input is 0

4. Which gate is considered a universal gate, meaning any other logic gate can be constructed using only this type?

A) AND gate B) OR gate C) NAND gate D) XOR gate

5. What is the Boolean expression for the NAND gate with inputs A and B?

A) (A + B)' B) (A . B)' C) A' + B' D) A' . B'

6. De Morgan's theorem states that (A + B)' is equivalent to:

A) A' + B' B) A' . B' C) A . B D) A + B

7. In Boolean algebra, the expression A + A' is equal to:

A) 0 B) 1 C) A D) A'

8. What does the Karnaugh map (K-map) method simplify?

A) Sequential circuits B) Combinational circuits C) Memory units D) Flip-flops

9. A combinational circuit's output depends only on its:

A) Current input B) Previous output C) Current state and previous input D) Past inputs

10. Which of the following is an example of a combinational circuit?

A) Shift register B) Counter C) Adder D) RAM

11. A sequential circuit's output depends on its:

A) Current input only B) Current input and current state C) Current state only D) Previous input only

12. Which of the following is an example of a sequential circuit?

A) Decoder B) Multiplexer C) Flip-flop D) Encoder

13. A flip-flop is a type of:

A) Combinational circuit B) Sequential circuit C) Logic gate D) Memory unit

14. Which type of flip-flop is sensitive to the rising edge of the clock pulse?

A) Level-triggered SR flip-flop B) Edge-triggered D flip-flop C) Level-triggered JK flip-flop D) Asynchronous T flip-flop

15. What is the characteristic equation for a JK flip-flop?

A) Q(t+1) = JQ' + J'Q B) Q(t+1) = D C) Q(t+1) = KQ' + K'Q D) Q(t+1) = Q XOR K

16. A D flip-flop is also known as a:

A) Toggle flip-flop B) Delay flip-flop C) Set-Reset flip-flop D) Master-slave flip-flop

17. What is the main function of a register?

A) To perform arithmetic operations B) To store a group of bits C) To control the timing of operations D) To convert analog signals to digital

18. A shift register can be used to:

A) Convert serial data to parallel data B) Convert parallel data to serial data C) Both (a) and (b) D) Perform logical AND operations

19. A counter is a sequential circuit that goes through a predetermined sequence of states upon the application of:

A) Data inputs B) Control signals C) Clock pulses D) Reset signals

20. What is a ripple counter?

A) A synchronous counter where all flip-flops change state simultaneously B) An asynchronous counter where the output of one flip-flop clocks the next C) A counter that counts up and down D) A counter that counts in BCD format

21. A synchronous counter has:

A) A ripple effect in state transitions B) All flip-flops triggered by the same clock pulse C) Independent clock signals for each flip-flop D) Slower state transitions

22. What is the maximum number of states a 3-bit counter can represent?

A) 3 B) 6 C) 8 D) 16

23. A BCD counter counts from:

A) 0 to 7 B) 0 to 9 C) 0 to 15 D) 0 to 16

24. Which type of memory is volatile and loses its data when power is turned off?

A) ROM (Read-Only Memory) B) RAM (Random Access Memory) C) Flash Memory D) EEPROM (Electrically Erasable Programmable Read-Only Memory)

25. Which type of memory is non-volatile and retains its data even when power is off?

A) SRAM (Static RAM) B) DRAM (Dynamic RAM) C) ROM (Read-Only Memory) D) Cache Memory

26. What does RAM stand for?

A) Read Access Memory B) Random Access Memory C) Register Access Memory D) Read Arithmetic Memory

27. What does ROM stand for?

A) Random Access Memory B) Read Only Memory C) Register Only Memory D) Read Arithmetic Memory

28. Which of the following is a type of RAM that uses latches to store each bit?

A) DRAM B) SRAM C) ROM D) PROM

29. Which type of RAM requires periodic refreshing to maintain its data?

A) SRAM B) DRAM C) ROM D) EEPROM

30. A decoder circuit takes a binary input and activates one of its multiple output lines based on the input value. It is a type of:

A) Sequential circuit B) Combinational circuit C) Register D) Counter

31. An encoder circuit performs the reverse function of a decoder. It takes multiple inputs and produces a binary code representing the active input. It is a type of:

A) Sequential circuit B) Combinational circuit C) Flip-flop D) Memory unit

32. A multiplexer (MUX) is a combinational circuit that selects one of several input lines and routes it to a single output line. The selection is controlled by:

A) Data inputs B) Clock signals C) Select lines D) Reset lines

33. A demultiplexer (DEMUX) performs the reverse operation of a multiplexer. It takes a single input and routes it to one of several output lines, controlled by:

A) Data inputs B) Clock signals C) Select lines D) Enable signals

34. Which logic gate outputs 0 if either input is 0, and 1 only if both inputs are 1?

A) OR gate B) AND gate C) NOT gate D) NAND gate

35. The expression A + 0 is equivalent to:

A) 0 B) 1 C) A D) A'

36. The expression A . 1 is equivalent to:

A) 0 B) 1 C) A D) A'

37. Which Boolean algebra property states that A + (B + C) = (A + B) + C?

A) Commutative Property B) Associative Property C) Distributive Property D) Identity Property

38. Which Boolean algebra property states that A . (B + C) = (A . B) + (A . C)?

A) Commutative Property B) Associative Property C) Distributive Property D) Absorption Property

39. A half-adder circuit adds two bits and produces a sum and a:

A) Carry-out B) Carry-in C) Overflow D) Parity bit

40. A full-adder circuit adds three bits (two input bits and a carry-in) and produces a sum and a:

A) Carry-out B) Carry-in C) Overflow D) Parity bit

41. What is the primary function of a clock signal in sequential circuits?

A) To provide data input B) To synchronize state changes C) To perform arithmetic operations D) To reset the circuit

42. An SR latch with S=1 and R=1 results in an invalid or indeterminate state for:

A) SR latch B) JK latch C) D latch D) T latch

43. Which type of flip-flop avoids the indeterminate state of an SR flip-flop by having J and K inputs connected together?

A) D flip-flop B) T flip-flop C) JK flip-flop D) SR flip-flop

44. A T flip-flop toggles its output when the T input is:

A) 0 B) 1 C) High D) Low

45. What is a 'state' in the context of sequential circuits?

A) The current input value B) The output of the combinational logic C) The current values stored in the flip-flops D) The clock signal frequency

46. Which of the following is a characteristic of a synchronous sequential circuit?

A) Asynchronous transitions between states B) Propagation delays affecting state changes C) All flip-flops triggered by a common clock D) Outputs depend only on current inputs

47. What is the purpose of a 'preset' or 'clear' input on a flip-flop?

A) To synchronize with the clock B) To asynchronously set or reset the flip-flop's state C) To control the data input D) To enable the output

48. Which memory type uses transistors and capacitors to store data?

A) SRAM B) DRAM C) ROM D) Flash Memory

49. Which memory type is generally faster and more expensive per bit than DRAM?

A) SRAM B) DRAM C) ROM D) EEPROM

50. What is the minimum number of NAND gates required to implement an AND gate?

A) 1 B) 2 C) 3 D) 4

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