ESE EC 2018 Achiever Study Plan: Digital Circuits Quiz 3

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Question 1

For an n-bit binary adder, what is the number of gates through which a carry has to propagate input to output?

• An
• B2n
• Cn²
• Dn+1

Question 2

In a successive approximation A/D converter, offset voltage which is LSB gets added to D/A converter’s output. Such operations will lead to:

• Afaster speed of operation.
• Breduce quantization error
• Cincrease bits at output.
• Dcover wide range of input voltage which needs to be converted.

Question 3

Consider the following statements:
The 8259A Programmable Interrupt Controller an
1) manage eight interrupts
2) vector an interrupt request anywhere in the memory map
3) have 8-bit or 16-bit interval between interrupt vector locations
4) be initialized with operational command words
Which of the above statements are correct?

• A1, 2 and 3 only
• B1, 2 and 4 only
• C3 and 4 only
• D1, 2, 3 and 4

Question 4

If the input to a T flip-flop is a 100 MHz signal, the final output of three T flip-flops in a cascade is :

• A1000 MHz
• B520 MHz
• C333 MHz
• D12.5 MHz

Question 5

The addition of the two numbers (1A8)₁₆ + (67B)₁₆ will be :

• A(889)₁₆
• B(832)₁₆
• C(823)₁₆
• D(723)₁₆

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