Engineering Answers

Draw the logic diagram of a 2-input CMOS NAND & OR gate and explain its working in

brief.

Explain flash-type A/D converter using neat circuit diagram and discuss the main

disadvantage of this converter.

Design a synchronous sequential Mealy circuit which produces an output Z=1, whenever the following input sequence ‘0110’ appears .Assume overlapping is allowed and implement using T-FFs.

Design a Synchronous counter that goes through states 0, 5, 3, 2, 6, 0, 5, 3... using J-K Flip-Flops. The counter should count only in 3-bit Gray codes.

Two instructors announced that they “grade on the curve,” that is, give a fixed percentage of each of

the various letter grades to each of their classes. Their curves are as follows:

If a random student came to you and said that his object was to enroll in the class in which he could

expect the higher grade point average, which instructor would you recommend?

Annual savings due to an energy efficiency project have a most likely value of $30,000. The high

estimate of $40,000 has a probability of 0.2, and the low estimate of $20,000 has a probability of 0.30.

What is the expected value for the annual savings?

A project has a life of 10 years, and no salvage value. The firm uses an interest rate of 12% to evaluate

engineering projects. The project has an uncertain first cost and net revenue.

What is the joint probability distribution for first cost and net revenue?

A road between Fairbanks and Nome, Alaska, will have a most likely construction cost of $4 million per

mile. Doubling this cost is considered to have a probability of 30%, and cutting it by 25% is considered

to have a probability of 10%. The state’s interest rate is 8%, and the road should last 40 years. What is

the probability distribution of the equivalent annual construction cost per mile?

Q3. “There is a mechanism in which CPU relinquishes the control over the buses for carrying out various operations between memory unit and I/O unit.”Justify your answer and explain such process in detail with the help of suitable diagram.

A tank initially contains 50 gal of fresh water. At t = 0, brine solution containing 2 lb of salt per gallon is poured into the tank at the rate of 12 gal/min, while the well stirred mixture leaves the tank at the rate of 8 gal/min. What is the amount of the salt at the end of minutes? How long it will take to obtain an amount of 50 lb?