Digital Electronics - ECE Questions and Answers

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The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE

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A master slave flip-flop has the characteristics that

change in the I/P immediately reflected in the O/P

change in the O/P occurs when the state of the master is affected

change in the output occurs when the state of the slave is affected

both the master and the slave states are affected at the same time

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Which of the following flip-flops is used as latch?

JK flip-flop

D flip-flop

RS flip-flop

T flip-flop

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Least expensive logic

RTL

DTL

TTL

ECL

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The circuit show in the figure has 4 boxes each described by inputs P, Q, R and outputs y, z with
Y = P ⊕ Q ⊕ R, Z = RQ + PR + QP The circuit act as a

4 bit adder giving P + Q

4 bit subtractor P - Q

4 bit subtractor Q - P

4 bit adder P + Q + R

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Logic pulser

generates short duration pulses

generates long duration pulses

generates sinusoidal voltage

generates ideal pulses

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The no. of FF required and the maximum decimal no. of a MOD-12 counter is

12, 12

4, 11

3, 6

4, 10

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In a four variable K map eight adjacent cells give

single variable term

two variable term

three variable term

four variable term

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The MOS symbol shown indicates that

It is depletion type
It is enhancement type
It is channel
It is P-channel
Electrons flow from s to D
Holes flow from D to s

The true statements are

1, 3, 6

1, 3, 5

2, 4, 6

2, 3, 5