ET1

Question 1

What is the input impedance for a non-inverting operational amplifier?

Answer 1

The value in the table.

Question 2

What is the input impedance for an inverting operational amplifier?

Answer 2

The resistor into the inverting input.

Question 3

Which symbol on an operational amplifier represents the inverting input?

Answer 3

Symbol: -

Question 4

Which symbol on an operational amplifier represents the non-inverting input?

Answer 4

Symbol: +

Question 5

To set up a non-inverting amplifier what does the inverting input have to connected to?

Answer 5

To ground. [0V]

Question 6

To set up an inverting amplifier what does the inverting input have to connected to?

Answer 6

Vin

Question 7

What is an application of transition gates?

Answer 7

Provide edge triggering.

Question 8

To set up an inverting amplifier what does the non-inverting input have to connected to?

Answer 8

To ground. [0V]

Question 9

What does TTL stand for?

Answer 9

Transistor-Transistor Logic

Question 10

What does CMOS stand for?

Answer 10

Complementary Metal Oxide Semiconductors

Question 11

In CMOS what range of Vcc can be used?

Answer 11

3V to 18V

Question 12

In TTL what range of Vcc can be used?

Answer 12

5V +/- 0.25V

Question 13

What is the upper threshold for a logic level 0 in TTL?

Answer 13

0.8V

Question 14

What is the lower threshold for a logic level 1 in TTL?

Answer 14

2V

Question 15

What is the upper threshold for a logic level 0 in CMOS?

Answer 15

0.3Vcc

Question 16

What is the lower threshold for a logic level 1 in CMOS?

Answer 16

0.7Vcc

Question 17

What is the simplified version of the Boolean expression A.(A+B)?

Answer 17

A.(A+B) = A.A + A.B = A + A.B = A.(1+B) = A

Question 18

What is the simplified version of the Boolean expression (A+B).(A+C)?

Answer 18

(A+B).(A+C) = A.A + A.C + A.B + B.C = A + A.C + A.B + B.C

= A + A.(B+C) + B.C = A.(1 + (B+C)) + B.C = A + B.C

Question 19

According to De Morgan’s theorem what is NOT A OR NOT B equivalent to?

Answer 19

A NAND B

Question 20

What is A AND NOT A equivalent to?

Answer 20

0

Question 21

What is A.1 equivalent to?

Answer 21

A

Question 22

What is A.0 equivalent to?

Answer 22

0

Question 23

What is A OR NOT A equivalent to?

Answer 23

1

Question 24

What is A + 1 equivalent to?

Answer 24

1

Question 25

What is A + 0 equivalent to?

Answer 25

A

Question 26

What is A + A.B equivalent to?

Answer 26

A + A.B = A.(B+1) = A

Question 27

What is an alternative method to Boolean algebra for simplifying a Boolean expression?

Answer 27

Karnaugh Maps

Question 28

What is the rate of transmission of a multiplexer also known as?

Answer 28

The baud rate.

Question 29

In what form does a multiplexer receive data?

Answer 29

Parallel from.

Question 30

In what form does a multiplexer transmit data?

Answer 30

Serial form.

Question 31

For a multiplexer with 2^n data inputs how many input select lines are there?

Answer 31

n select lines.

Question 32

Explain how a multiplexer can be reconfigured to perform a different logic function.

Answer 32

By altering the connections between the D inputs and the power rails.

Question 33

Why is a resistor needed with a switch?

Answer 33

To prevent short-circuit of power rails.

Question 34

What is 45 in binary?

Answer 34

101101

Question 35

What is 45 in binary coded decimal (BCD)?

Answer 35

0100 0101

Question 36

To make a BCD counter from a 4-bit binary counter what number in binary must it reset on?

Answer 36

1010 [10 in decimal]

Question 37

For a rising-edge triggered D-Type Flip Flop what happens when NOT Q when NOT R is taken to logic level 0?

Answer 37

NOT Q is at logic level 1.

Question 38

How many pulses does the 2 Hz clock produce in 60 seconds?

Answer 38

120

Question 39

To draw a voltage transfer characteristic for an operational amplifier what needs to be on each of the axis?

Answer 39

x-axis: Vin (V) | y-axis: Vout (V)

Question 40

When drawing a frequency response for an operational amplifier, what goes on each axis?

Answer 40

x-axis: Frequency (Hz) | y-axis: Voltage gain

Question 41

When drawing a frequency response for an operational amplifier, the gain holds for a while and then slopes down. What point must this slope pass through?

Answer 41

x-coordinate: Bandwidth | y-coordinate: 0.7*gain

Question 42

How can an input be held at logic level 1 until a switch is closed?

Answer 42

Use a pull-up resistor.

Question 43

What does the circle ( o ) on the reset connection indicate?

Answer 43

Reset why R is at logic level 0. [active low]

Question 44

When producing either an up or down counter using d-type flip flops what must NOT Q output go to?

Answer 44

The D input of the same flip flop.

Question 45

For a down counter made out of d-type flip flops what does the input to the clock of the next IC have to be from?

Answer 45

The Q output of the flip flop.

Question 46

For a down counter made out of d-type flip flops what does the LED output have be connected to?

Answer 46

The Q output of the flip flop.