Chapter 3 &4 Review

Question 1

The decimal system uses the number 9 as it’s base.

Answer 1

FALSE

Question 2

To express a number in binary requires fewer digits than in the decimal system.

Answer 2

FALSE

Question 3

In the Gray Code there is a maximum of one bit change between two executive numbers.

Answer 3

TRUE

Question 4

The radix of a number system is the same as the base.

Answer 4

TRUE

Question 5

All gates are devices that have one input with which they perform logic decisions and produce a result at one or more of their outputs.

Answer 5

FALSE

Question 6

Only one input to an OR gate must be 1 or produce a 1 output.

Answer 6

TRUE

Question 7

The AND function, implemented using switches, will mean switches connected in parallel.

Answer 7

FALSE

Question 8

A two input OR function, expressed as a Boolean equation, would be Y+AB

Answer 8

FALSE

Question 9

Hardwired logic is fixed and is changeable only by altering the way devices are connected.

Answer 9

TRUE

Question 10

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

Answer 10

FALSE

Question 11

The number 12 is:
A. 12 in any number system
B. 12 is decimal
C. 12 in binary
D. All the above

Answer 11

B

Question 12

The binary nnumber 101 has the decimal equivalent of:
A. 3
B. 101
C. 41
D.5

Answer 12

D

Question 13

The Octal number 153 would be written in binary as:
A. 011         101  001
B. 001         101  011
C. 011          111    101
D.010          100   011

Answer 13

B

Question 14

The decimal number 28 would be written in binary as:
A. 11100
B. 00111
C. 10110
D. 01011

Answer 14

A

Question 15

The hexadecimal number C4 would be written in binary as:
A. 21
B. 48
C. 182
D. 196

Answer 15

D

Question 16

The main advantage of using Gray Code is:
A. Only one digit changes as the number increases.
B. It can be easily concerted to decimal numbers.
C. Large decimal numbers can be written using fewer digits.
D. It uses the number 2 as it’s base.

Answer 16

A

Question 17

All digital computing devices operate using the binary number system because:
A. Most people are familiar with it.
B. Large decimal numbers can be represented in a shorter form.
C. Digital circuits can be easily distinguished between two voltage levels.
D. All the above.

Answer 17

C

Question 18

If a given memory until consists of 1250 16-bit words, the memory capacity would be rated:
A. 1250 bits
B.20,000 bits
C. 3260 bits
D. 156 bits

Answer 18

B

Question 19

In the sign bit position, a 1 is indicates an:
A. Negative number
B. Positive number 
C. Octal Code
D.Hexadecimal code

Answer 19

A

Question 20

A(n) \_\_\_\_\_\_ bit is used to detect errors that may occur while a word is moved.
A. Parity
B. Negative
C. Positive
D. Overflow

Answer 20

A

Question 21

In conventional logic circuits, binary 1 represents:
A. The process of a signal.
B. The occurrence of some event.
C. A high voltage level.
D. All the above

Answer 21

D

Question 22

A NOT function is used when a logic 1 must \_\_\_ some device
A. Activate 
B. Deactivate
C. Switch
D. Light

Answer 22

B

Question 23

A single rung of a ladder logic program is arranged with:
A. Input conditions connected from left to right, with the output at the far right.
B. Input conditions connected from right to left, with output at the far left.
C. The output in the center and the input conditions to the left and right of it.
D. All the input conditions in parallel and all output conditions in series.

Answer 23

A

Question 24

The basic XOR function is:
A. If one or the other, but not both, inputs are 1, the output is 1.
B. If one or more inputs are 1, the output will be 1.
C. If one or more inputs are 1, the output is 0.
D. If one or more inputs are 0, the output is 1.

Answer 24

A

Question 25

If you want to when one or both matching bits in two different words are ON, you would use the logic instruction.
A. AND 
B. XOR
C. OR
D. NOT

Answer 25

C

Question 26

The hexadecimal system consists of 16 digits including the numbers 0 through 9 and letters A through F.

Answer 26

True

Question 27

programmable control is based on logic functions that are programmable and easily changed.

Answer 27

True

Question 28

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

Answer 28

True

Question 29

The octal number system consists ofdigits 0,1,2,3,4,5,6,7. There are no 8’s or 9’s.

Answer 29

True

Question 30

For a base 8 number system, the weight value associated with the third digit would be:
A. 512
B. 64
C. 32
D. 16

Answer 30

D

Question 31

In any number system, the position of a digit that represents part of the number has a weight associated with its value. The place weights for binary:
A. Increase by adding 2 for each place, starting with 0.
B. Start with 2 and double for each successive place.
C. Start with 1 and are successive powers of 2.
D. Increase by adding 2 for each place, starting with 2.

Answer 31

C

Question 32

A gate is a device that:
A. performs a logical decision based on its inputs.
B. changes alternating current to direct current.
C. performs a logical decision based on its outputs.
D. allows current flow in one direction only.

Answer 32

A

Question 33

The NOT function can be thought of as:
A. False-to true converter
B. a changer of states
C. an inverter
D. All of these

Answer 33

C

Question 34

The 2’s complement form of a binary number is the binary number that results when:
A. All the 0’s are changed to 1’s.
B. 1 is subtracted from the 1’s complement.
C. 1 is added to the 1’s complement.
D. All the 1’s are changed to 0’s.

Answer 34

C

Question 35

An AND gate operates on the same principle as:
A. A series circuit.
B. A parallel circuit.
C. A series-parallel circuit.
D. none of these

Answer 35

A

Question 36

An\_\_\_\_\_\_ bit is used to detect errors that may occur while a word is moved.
A. negative
B. overflow
C. positive
D. parity

Answer 36

D