Question 1

With reference to the logic circuit,the output Y will be at a logic 1 when:

Accepted Answer

A)  inputs A and B are logic 1.
B)  input A or B is logic 1.
C)  input A is at logic 1 and input B is at logic 0.
D)  input A is at logic 0 and input B is at logic 1.E) C) and D)
F) A) and B)

Question 2

In conventional logic circuits,binary 1 represents:

Accepted Answer

A)  the presence of a signal.
B)  the occurrence of some event.
C)  a high voltage level.
D)  all of these.E) B) and D)
F) C) and D)

Question 3

The Boolean expression for the logic circuit drawn is:

Accepted Answer

A)  Y = (A 
B)  (C
D)  
B)   
C)   
D)  Y= ABC + DE) B) and D)
F) B) and C)

Question 4

The logic symbol drawn is that of the:

Accepted Answer

A)  AND function.
B)  OR function.
C)  NOR function.
D)  NAND function.E) A) and B)
F) A) and D)

Question 5

All inputs to a NAND gate must be 1 to produce a 1 output.

Accepted Answer

A) True 
 B)False

Question 6

On some PLCs,only one output is allowed per ladder logic rung.

Accepted Answer

A) True 
 B)False

Question 7

The basic rule for an AND gate is:

Accepted Answer

A)  if all inputs are 1,the output will be 1.
B)  if all inputs are 1,the output will be 0.
C)  if all inputs are 0,the output will be 1.
D)  both a and b.E) None of the above
F) B) and D)

Question 8

All inputs to a NOR gate must be 1 to produce a 1 output.

Accepted Answer

A) True 
 B)False

Question 9

Ladder logic is a graphical representation of a user program.

Accepted Answer

A) True 
 B)False

Question 10

Which of the hardwired relay schematics is being implemented by the PLC program shown?

Accepted Answer

A)  (a) 
B)  (b) 
C)  (c) 
D)  (d) E) None of the above
F) A) and B)

Question 11

A NOR gate is:

Accepted Answer

A)  an AND gate with an inverter connected to the output.
B)  an OR gate with an inverter connected to the output.
C)  equivalent to a series circuit.
D)  equivalent to a parallel circuit.E) All of the above
F) C) and D)

Question 12

Inverting the output of an OR gate will result in creating a NOR gate.

Accepted Answer

A) True 
 B)False

Question 13

There is no difference between a relay schematic and a ladder logic program.

Accepted Answer

A) True 
 B)False

Question 14

The Boolean equation for the logic symbol is:

Accepted Answer

A)  A = Y
B)  A=B
C)   
D)   E) A) and B)
F) A) and C)

Question 15

The Boolean equation for the logic symbol is:

Accepted Answer

A)  Y= A+B+C
B)  Y = ABC
C)  Y= (A
B)  +C
D)  Y = (A -
B)  CE) C) and D)
F) A) and C)

Question 16

The logic function(s) used by PI-Cs is (are) :

Accepted Answer

A)  AND
B)  OR
C)  NOT
D)  all of these.E) B) and D)
F) B) and C)

Question 17

A NOT function is used when a logic 1 must ________ some device.

Accepted Answer

A)  activate
B)  deactivate
C)  switch
D)  lightE) A) and C)
F) B) and D)

Question 18

A single rung of a ladder logic program is arranged with:

Accepted Answer

A)  input conditions connected from left to right,with the output at the far right.
B)  input conditions connected from right to left,with the output at the far left.
C)  the output in the center and the input conditions to the left and right of it.
D)  all input conditions in parallel and all output conditions in series.E) A) and D)
F) C) and D)

Question 19

The Boolean expression for the logic circuit drawn is:

Accepted Answer

A)  Y = ABC
B)  Y=A+B+C
C)  Y = (A + 
B)  C
D)  Y=AB+CE) A) and C)
F) A) and B)

Question 20

All inputs to an AND gate must be 1 to produce a 1 output.

Accepted Answer

A) True 
 B)False

Exam 4: Fundamentals of Logic

On some PLCs,only one output is allowed per ladder logic rung.

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The Boolean equation for the logic symbol is:

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Which of the hardwired relay schematics is being implemented by the PLC program shown?

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All inputs to a NOR gate must be 1 to produce a 1 output.

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The basic rule for an AND gate is:

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Inverting the output of an OR gate will result in creating a NOR gate.

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A single rung of a ladder logic program is arranged with:

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Ladder logic is a graphical representation of a user program.

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The Boolean expression for the logic circuit drawn is:

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A NOR gate is:

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All inputs to an AND gate must be 1 to produce a 1 output.

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In conventional logic circuits,binary 1 represents:

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The logic symbol drawn is that of the:

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All inputs to a NAND gate must be 1 to produce a 1 output.

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The logic function(s) used by PI-Cs is (are) :

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The Boolean equation for the logic symbol is:

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With reference to the logic circuit,the output Y will be at a logic 1 when:

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The Boolean expression for the logic circuit drawn is:

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A NOT function is used when a logic 1 must ________ some device.

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There is no difference between a relay schematic and a ladder logic program.

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