Digital Computer Science Questions & Answers - Set 05 - ObjectiveBooks
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Digital Computer Science Questions & Answers - Set 05

Practice Test: Question Set - 05


1. Conversion of decimal number 9910 to it's octal number equivalent is
    (A) 1218
    (B) 1438
    (C) 1248
    (D) 1198

2. What is the main advantage of using MOSFET rather than bipolar transistor circuitry in ICs?
    (A) Much greater complexity (more components) than bipolar circuits: better economy
    (B) Higher operating speed than bipolar circuits
    (C) Fewer power supply connections are required with MOS ICs
    (D) System designers are more familiar with MOS circuitry

3. Computer ICs work reliably because they are based on _______ design.
    (A) Top-bottom
    (B) System
    (C) Two-stage
    (D) Two-states

4. Which gates is known as universal gate?
    (A) NOT gate
    (B) AND gate
    (C) NAND gate
    (D) XOR gate

5. A combinational logic circuit which is used to send data coming from a single source to two or more separate destinations is called as
    (A) Decoder
    (B) Encoder
    (C) Multiplexer
    (D) De-multiplexer

6. Conversion of an octal number 1368 to hexadecimal number is
    (A) 7E16
    (B) 5E16
    (C) 5A16
    (D) 5D16

7. The _______ gate has two or more input signals. All inputs must be high to get a high output
    (A) OR
    (B) NAND
    (C) AND
    (D) NOR

8. The 2764 is 65,536-bit EPROM organized as 8,192 words of 8 bits each. How many address lines does it have?
    (A) 8
    (B) 12
    (C) 13
    (D) 14

9. The output of the following gate is 0 only if at least one of the inputs is 1:
    (A) AND gate
    (B) OR gate
    (C) EX-OR gate
    (D) NOR gate

10. Addition of 1101012 and 1011112 is
    (A) 11001002
    (B) 11010002
    (C) 11101112
    (D) 1100112

11. The fan-out capability of a digital building block can be defined as
    (A) The number of inputs that one output can transmit to
    (B) The amount of cooling required for fanning the air out
    (C) The number of inputs that can transmit to one input
    (D) The maximum power dissipation (heat generation) that the unit can stand

12. The m-bit parallel adder consists of:
    (A) (m+1) full adders
    (B) m/2 full adders
    (C) m-1 full adders
    (D) m full adders

13. An inventor is a gate with only _______ input; the output is always in the opposite state from the input
    (A) One
    (B) Two
    (C) More than one
    (D) None of the above

14. Standard TTL has a multiple emitter input transistor and a ________ output
    (A) Totem-pole
    (B) Bipolar
    (C) Register
    (D) Transistor

15. The EXCLUSIVE - NOR gate is equivalent to an ________ gate followed by an inverter.
    (A) OR
    (B) AND
    (C) NAND
    (D) XOR

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