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Digital Electronics

141.

Decimal number 10 is equal to binary number

Answer: B

1010 = 8 + 2 = 10 in decimal.

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142.

A 4 bit modulo 16 ripple counter uses JK flip-flops. If the propagation delay of each FF is 50 ns. The max. clock frequency that can be used is equal to

Answer: C

Propagation Delay for one FF is 50 nsec. For 4 FF = 50 x 4 = 200 nsec.

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Answer: B

4 = 22, in up scaling digit will be shifted by two bit in right direction.

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144.

Hexadecimal number E is equal to binary number

Answer: A

E = 14 in decimal or 1110 (8 + 4 + 2 + 0 = 14) is binary.

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145.

A device which converts BCD to seven segment is called

Answer: B

Decoder converts binary/BCD to alphanumeric.

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146.

The number of counter states which an 8 bit stair step A/D converter has to pass through before conversion takes place is equal to

Answer: D

No Explanation.

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Answer: C

Modulus 13 x modulus 6 = modulus 78.

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148.

An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is

Answer: A

10000000 = 128, 11111111 = 255

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149.

A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time

Answer: A

No Explanation.

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150.

The maximum counting range of a four stage counter using IC 74193 is

Answer: C

IC 74193 is a divide by 16 counter.

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