Digital Computer Fundamentals - Questions & Answers for Competitive Exams | GkSeries

25. Which device has many inputs and one output?

• [A] Flip flop.
• [B] Multiplexer.
• [C] Demultiplexer.
• [D] Counter.

Answer: Option [B]

26. The other name of demultiplexer __________.

• [A] data distributor.
• [B] data multiplier.
• [C] data converter
• [D] data selector.

Answer: Option [A]

27. How many inputs and outputs are used to construct a full adder?

• [A] 3 inputs and 2 outputs.
• [B] 2 inputs and 1 output.
• [C] 1 input and 1 output.
• [D] 1 input and 2 outputs.

Answer: Option [A]

28. Which combinational circuit that performs subtraction involving three bits?

• [A] Single subtractor.
• [B] Half subtractor.
• [C] Full subtractor.
• [D] Multi subtractor.

Answer: Option [C]

29. A 3-to-8 decoder is also called __________.

• [A] binary-to-octal decoder.
• [B] decimal-to-octal decoder.
• [C] octal-to-binary decoder.
• [D] octal-to-decimal decoder.

Answer: Option [A]

30. An encoder is a digital circuit that performs the __________ operation of a decoder.

• [A] inverse
• [B] reverse
• [C] forward
• [D] backward

Answer: Option [A]

31. The output of halfadder is in the form of ____________.

• [A] sum.
• [B] carry.
• [C] sum and carry.
• [D] none of these.

Answer: Option [C]

32. _________ are used for converting one type of number system into the other form.

• [A] Decoder.
• [B] Encoder.
• [C] Multiplexer.
• [D] Demultiplexer.

Answer: Option [B]

33. The basic storage element in a digital system is _________

• [A] flip flop.
• [B] counter
• [C] multiplexer
• [D] encoder

Answer: Option [A]

34. What is the other name of T flip flop?

• [A] Trigger
• [B] Toggle
• [C] Both A and B.
• [D] Translator.

Answer: Option [C]

35. A register is a group of __________ suitable for storing binary information.

• [A] counters
• [B] adders
• [C] flip flops.
• [D] subtractors.

Answer: Option [C]

36. A group of flipflops sensitive to pulse duration is called _________

• [A] registers.
• [B] latch.
• [C] multiplexer.
• [D] demultiplexer.

Answer: Option [B]