4th Cycle DE

A device that is used to switch one of several input lines to a single output line is called a

• Comparator
• Decoder
• Counter
• Multiplexer

The highest decimal value that can be represented as a 4-bit binary number is ________.

• 32
• 8
• 15
• 7

A logic gate that produces a HIGH output only when all of its inputs are HIGH is a(n

• OR gate
• AND Gate
• NAND gate
• Magic

A 2-input gate produces the output shown (X represents the output) This is a?

• Bunch of lines
• OR gate
• NOR gate
• NAND gate

Assume an SOP expression is AB + CD. The equivalent POS expression is

• (A + B) + (C + D)
• (A + B)(C + D)
• (AB)(CD)
• None of the above

The circuit shown is equivalent to an

• AND gate
• XOR gate
• OR gate
• NOR gate

The output of the decoder in Figure 6-3 will be 1 only when

• A = 1, B = 0, C= 1, D = 0
• A = 0, B = 1, C= 0, D = 1
• A = 1, B = 1, C= 1, D = 1
• A =0, B = 0, C= 1, D = 0

Convert 128 to binary

• 10000000
• 01111110
• 10000001
• 11001100

The circuits contain identical lamps and identical cells. In which circuit will the lamps be brightest? 

• A
• B
• C
• D

Resistance is measured in:

• volts
• amps
• ohms
• watts