Test
PLC - Chapter 3: Number Systems and Codes
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Preguntas del test (40)
1The decimal system has a base of __.
- A10
- B100
- C1000
- D2
2The decimal number 7 would be written in binary as 1011.
- AVerdadero
- BFalso
3To express a number in decimal requires fewer digits than in the binary system.
- AVerdadero
- BFalso
4For a base 2 number system, the weight value associated with the 3rd digit would be 4.
- AVerdadero
- BFalso
5Label the "Sign Bit" and the "Magnitude Bits"
- ASign Bit
- BMagnitude Bits
6What is the decimal value of binary 110010?
- A48
- B13
- C26
- D7
7The decimal number 15 would be written in binary as
- A1111
- B4C
- C1000
- D00011001
8Data can be stored in one 16-bit word as two separate groups of 8-bit data.
- AVerdadero
- BFalso
9To represent a negative number in 1's complement, you simply take the number's magnitude and flip all the bits (i.e. 1 becomes 0, and 0 becomes 1).
- AVerdadero
- BFalso
10+3 binary representation: 0011
-3 binary representation: [blank_start]1100[blank_end] (1's complement)- A1100
11The octal numbering system has a base of 9.
- AVerdadero
- BFalso
12The weights for the octal numbering system are: 1, [blank_start]8[blank_end], [blank_start]64[blank_end], 512, ...
- A8
- B64
13Numbers 8 and 9 are not allowed in the octal numbering system.
- AVerdadero
- BFalso
14Fill in the missing number.
- A312
- B306
- C300
- D350
15Convert this octal number to binary.
- A1
- B0
- C0
- D1
- E1
- F0
- G0
- H1
- I0
16The hexadecimal numbering system can be summarized as follows:
Sixteen digits: 0, 1, 2, 3, 4, 5, [blank_start]6[blank_end], [blank_start]7[blank_end], [blank_start]8[blank_end], [blank_start]9[blank_end], [blank_start]A[blank_end], [blank_start]B[blank_end], [blank_start]C[blank_end], [blank_start]D[blank_end], [blank_start]E[blank_end], [blank_start]F[blank_end]- A6
- B7
- C8
- D9
- EA
- FB
- GC
- HD
- IE
- JF
17The weights of the hexadecimal system are powers of base 16 (i.e. 1, 16, 256, etc.).
- AVerdadero
- BFalso
18To convert a hexadecimal number to its decimal equivalent, the hexadecimal digits in the columns are divided by the base 16 weight.
- AVerdadero
- BFalso
19Convert this hex number into binary.
- A0
- B0
- C0
- D1
- E1
- F0
- G1
- H1
- I0
- J1
- K1
- L1
20The BCD (Binary-Coded Decimal) numbering system provides a convenient way of handling [blank_start]large[blank_end] numbers that need to be inputted to or outputted from a PLC.
- Alarge
- Bsmall
21Convert this decimal number into a BCD number.
- A0
- B1
- C1
- D1
- E1
- F0
- G0
- H0
- I0
- J1
- K1
- L0
- M0
- N0
- O1
- P1
22This instruction will convert the binary bit pattern at the source address [blank_start]N7:23[blank_end], into a [blank_start]BCD[blank_end] bit pattern of the same decimal value as the destination address, [blank_start]O:20[blank_end]. The instruction executes every time it is scanned and the instruction is true.
- AN7:23
- BO:20
- CBCD
23The Gray code is a special type of binary code that uses position weighting.
- AVerdadero
- BFalso
24ASCII stands for [blank_start]American[blank_end] [blank_start]Standard[blank_end] [blank_start]Code[blank_end] for [blank_start]Information[blank_end] [blank_start]Interchange[blank_end]. It is an alphanumeric code because it indicates letters as well as numbers.
- AAmerican
- BStandard
- CCode
- DInformation
- EInterchange
25Gray codes are used with [blank_start]position encoders[blank_end] for accurate control of the motion of robots, machine tools, and servomechanisms.
- Aposition encoders
26Some PLC communications systems use a [blank_start]parity[blank_end] bit to check the accuracy of data transmission. For example, when data are transferred between PLCs, one of the binary bits may accidentally change states.
- Aparity
27The two systems of parity normally used are odd and even.
- AVerdadero
- BFalso
28Odd parity means that the total number of binary 1 bits in the character, including the parity bit, is [blank_start]odd[blank_end]. Even parity means that the total number of binary 1 bits in the character, including the parity bit, is [blank_start]even[blank_end].
- Aodd
- Beven
- Ceven
- Dodd
29In the binary system + and – symbols are used to indicate whether a number is positive or negative.
- AVerdadero
- BFalso
30The octal number 153 would be written in binary as:
- A011 101 001
- B011 111 101
- C001 101 011
- D010 100 011
31What is the decimal equivalent for the BCD number 1000 0100 0010 0001?
- A8421
- B7863
- C1234
- D3728
32The Gray code is set up so that as we progress from one number to the next, only one bit changes.
- AVerdadero
- BFalso
33Which code is used to convert the keystrokes on the keyboard of a computer for the processor?
- ABCD
- BHEX
- CASCII
- DOCTAL
34A parity bit is used to check the _______ of data transmission.
- Aspeed
- Btype
- Caccuracy
- Dtime
35What is the sum of binary numbers 1100 and 1011?
- A10110
- B10111
- C11100
- D00111
36Which instruction is used to compare the relative magnitude of two quantities?
- AAdd
- BSubtract
- CMultiply
- DLess Than
37The process for dividing one binary number by another is the same for both binary and decimal numbers.
- AVerdadero
- BFalso
38Solve this.
- A11110
39Solve this.
- A0100
40Good luck, babe
- AI love you
- B<3
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