ST Microelectronics Papers: Sample Questions 1 - 3 of 40
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Question number: 1
» Aptitude
Write in Short
What are the gates used in half adder.
Explanation
- Two gates are used in half adder digital circuit, namely XOR and AND gate.
- There are two inputs and two outputs to half adder circuit.
- Input: A and B any digital data
- Output: Sum (S) and Carry (C) of input digits A and B
- XOR gate is used to carry out the sum of two input digits and AND gate is used to calculate the carry if present.
- Truth table of half adder circuit:
A | B | Sum | Carry |
0 | 0 | 0 | 0 |
0 | 1 | 1 | 0 |
1 | 0 | 1 | 0 |
1 | 1 | 0 | 1 |
Question number: 2
» Aptitude
Write in Short
The girl’s age is twice that of boy, if the boy is four years old. After four years what will be the age of girl?
Explanation
At present,
Boy’s age, b = 4 years
Girl’s age, g = 2b = 8 years
After 4 years
Boy’s age, = b + 4 = 8 years
Girl’s age, = g + 4 = 12 years
After 4 years age of girl will be 12 years.
Question number: 3
» Aptitude
Write in Short
Y catches 5 times more fishes than X. If total number of fishes caught by X and Y is 42, then number of fishes caught by X?
Explanation
Here, Y catches 5 times more fishes than X. So, Y = 5X
And total number of fishes caught by X and Y is 42. So, X + Y = 42
Substituting the value of Y in terms of X
We can get, X + 5X = 42
6X = 42
X = 7