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DIGITAL ELECTRONICS

Study Materials

For Various Competitive Exams 

Q.1.The number of digits in octal system is?

1. 8
2. 7
3. 8 or 7
4. 10

Q.2.The number of digits in hexadecimal system is?

1. 15
2. 10
3. 16
4. 8

Q.3.The number of bits in a nibble is?

1. 8
2. 2
3. 4
4. 16

Q.4.The digit F in hexadecimal system is equivalent to number...........in decimal system?

1. 16
2. 15
3. 17
4. 8

Q.5.Which of the following binary number is equivalent to decimal 10?

1. 1010
2. 1000
3. 1001
4. 1100

Q.6.The number FF in a hexadecimal system is equivalent to number..........in a decimal system ?

1. 256
2. 240
3. 255
4. 239

Q.7.ICs are?

1. analog
2. digital
3. both Analog and digital
4. mostly analog

Q.8.The rate of change of digital signals between High and low level is?

1. very fast
2. fast
3. slow
4. very slo

Q.9.Digital circuits mostly use?

1. Diodes
2. Bipolar transistors
3. Diodes and bipolar transistor
4. Bipolar transistors and FETs

Q.10.Two voltages are-5V and-10V.In positive logic?

1. -5V is 1 and -10V is 0
2. -10 Vis 1 and-5V is 0
3. -5V is 1 and -10V is1
4. -5V is 0 and -10V is 0

Q.11.Logic Pulser ?

1. generate short duration pulses
2. generate long duration pules
3. generate ideal pulses
4. None of these

Q.12.The number of LED displays in duration in logic probe are?

1. 1
2. 2
3. 4
4. 1 or 2

Q.13.The output impenitence of a logic pulser is?

1. Low
2. High
3. May be low or high
4. Can't say

Q.14.A current transducer respond to?

1. steady current only
2. pulsating current only
3. both pulasting and steady
4. none of these

Q.15.Logic analyser is?

1. a multi channel oscilloscope
2. similar to logic pulser
3. similar to current tracer
4. none of above

Q.16.Which of these are two state device?

1. Lamp
2. magnetic tap
3. punched card
4. All the above

Q.17.In the decimal number 27,the digit 2 represent ?

1. 2
2. 0.2
3. 20
4. 200

Q.18.In Hexadecimal number system,A is equal to decimal number?

1. 10
2. 17
3. 11
4. 18

Q.19.Hexadecimal number F is equal to octal number?

1. 15
2. 17
3. 16
4. 18

Q.20.Hexadecimal number E is equal to binary?

1. 1110
2. 1001
3. 1111
4. 1101

Q.21.Binary number 1101 is equal to octal number?

1. 17
2. 15
3. 16
4. 14

Q.22.ocatal number 12 is equal to decimal number?

1. 8
2. 9
3. 11
4. 10

Q.23.100101 is equal to decimal number ?

1. 27
2. 37
3. 17
4. 47

Q.24.Decimal number 10 is equal to binary number?

1. 1110
2. 1001
3. 1010
4. 1000

Q.25.Decimal number 110011011001 is equal to decimal number?

1. 3289
2. 1289
3. 2289
4. 289

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