Exercise: Digital Electronics

Questions for: Digital Electronics

A 6 bit DAC uses binary weighted resistors. If MSB resistor is 20 k ohm, the value of LSB resistor is
A:
20 k ohm
B:
80 k ohm
C:
320 k ohm
D:
640 k ohm
Answer: D

Resistances are R, 2R, 4R, 8R, 16R and 32R.

LSB resistance = 32R = 32 x 20 = 640 K ohm.

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The circuit in the figure is has two CMOS-NOR gates. This circuit functions as a
A:
flip-flop
B:
schmitt trigger
C:
monostable multivibrator
D:
astable multivibrator
Answer: C

It is simple monostable multivibrator.

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With on-chip decoding, n address lines can access
A:
2n memory locations
B:
2n2 memory locations
C:
2n memory locations
D:
n2 memory location
Answer: C
No answer description is available. Let's discuss.
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In a gate output is Low if and only if all inputs are High. The gate is
A:
OR
B:
AND
C:
NOR
D:
NAND
Answer: D
No answer description is available. Let's discuss.
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The content of which of the following determines the state of the CPU at the end of the execute cycle (when the interrupt is recognized)?
  1. Program counter
  2. Processor register
  3. Certain status conditions
Select the correct answer using the codes given below :
A:
1 and 2
B:
2 and 3
C:
1 and 3
D:
1, 2 and 3
Answer: C

It is the state at which interrupt is recognized program counter and certain status condition.

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