# Flexible Manufacturing System Questions and Answers – Discrete Control – Truth Tables

This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “Discrete Control – Truth Tables”.

1. Which of the following is designed to give an output based on the given input?
a) Amplifier
b) Logic Gate
c) Reducer
d) Binary Gate

Explanation: The specified output based on the given input is given by the logic gates. It is designed in order to give the output according to the application of the given parameters. It is primarily employed in robotics.

2. Which of the following is not a logic gate?
a) AND
b) OR
c) NOT
d) WHETHER

Explanation: WHETHER is not a logic gate. AND, OR, NOT are the most simplified and commonly used logic gates. These are the basic elements of the logic control. Logic Gates are an idealized model of triggering a device based on the parameters.

3. NOT Gate uses only one input.
a) True
b) False

Explanation: The logic gate which uses only single input is known as NOT gate. It reverses the input signal and the same will be given as output. It can be used to open a circuit upon receiving the signal from the user.

4. What will be the value for the expression X • (X + Y) according to the law of absorption?
a) XY
b) X + X • Y
c) X – Y
d) XYX

Explanation: According to the law of absorption, X • (X + Y) = X + X • Y. This law functions by pairing Binary operations through identity linking.

5. Which logic gate returns the value of 1 if the inputs are either 1 or 0?
a) OR
b) NOT
c) AND
d) NAND

Explanation: The logic gate returning the value of 1 if the inputs are either 1 or 0 or both the inputs are 1 are known as OR gate. It can be used in parallel circuits so that the device gets triggered upon receiving inputs from any one of the inputs.

6. Which of the following will be the output for the given expression X + Y according to the Commutative law provided X and Y are the two inputs given to the system?
a) X – Y
b) Y + X
c) Y – X
d) XY

Explanation: According to the commutative law, X + Y = Y + X. This property explains that the output will remain unchanged if the inputs are swapped from their position.

7. Which logic gate is formed by the combination of AND and NOT gate?
a) VAND
b) NAND
c) OAND
d) TAND

Explanation: The logic gate which is formed by the combination of AND and NOT gate is known as NAND gate. It performs the functions in the combination of both AND and NOT logic gates. Its output will be the complement of AND gate.

8. Which of the following has the combination of NOT and OR logic gates?
a) NOR
b) OR
c) AND
d) NAND

Explanation: The logic gate which has the combination of NOT and OR logic gates is known as NOR gate. Its output will be the complement of OR gate. It is formed by OR gate followed by the NOT gate. In this gate, a high output is obtained with two low inputs.

9. NAND is an exclusive OR gate.
a) True
b) False

Explanation: XOR gate is an exclusive OR gate. In this logic gate, a true output is obtained if one and only one of the inputs to the gate is true. If both inputs are either high or low, then low value will be the output.

10. What will be the value of the expression X + Y according to De Morgan’s theorem?
a) Y + X
b) XY
c) XY
d) X + Y

Explanation: According to De-Morgan’s theorem, X + Y = XY. This law explains that the complement of the sum of all the terms is equal to product of each compliment.

11. Which logic gate gives the output only when the given inputs are true?
a) AND
b) NOT
c) OR
d) POR

Explanation: The logic gate which gives the output only when the all the inputs are true are termed as AND gate. It returns the value of 1, when both the inputs are 1. If anyone of the inputs are low (i.e., 0), the output will be low.

12. Which of the following is the tabulation of the combination of all the input values and the corresponding output values?
a) Truth Table
b) Calculation Table
c) Output Table
d) Tabulation Table

Explanation: The table which contains the combination of all the input values and the corresponding values is known as Truth table. It differs according to the type of logic gates used. A Truth table consists mostly of four possible combinations.

13. Which of the following system is commonly used to establish the relation between logic elements in a given logical control system?
a) Control Diagram
b) Base Diagram
c) Flow Diagram
d) Logic Network Diagram

Explanation: In order to establish the relation between the logic elements in a given logical control system, Logic Network Diagram is used. It uses various symbols to denote the different logic gates typically used in a system.

14. What will be the value for the expression X • X according to inclusion theorem?
a) 1
b) 0
c) X
d) X

Explanation: According to Inclusion theorem, X • X = 0. 1, X and X are not the correct values for the expression X • X according to inclusion theorem.

15. What will be the value for the expression, X + X according to inclusion theorem?
a) X
b) X + X • X
c) 0
d) 1

Explanation: According to Inclusion theorem, X + X = 1. X, X + X • X and 0 were not the correct values for the expression X + X according to inclusion theorem.

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