ECE Exam 2

Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?

NOR

The truth table below pertains to a _____.

OR gate

The logic gate that will have HIGH or "1" at its output when any one of its inputs is HIGH is a(n):

OR gate.

For the full adder, X, Y and Cin are the inputs to the adder and S and Cout are the outputs of the adder. If X = 0, Y = 1, and Cin = 0, Then S = ___ and Cout = ___

S = 1, Cout = 0.

Silicon uses four electrons to form bonds with adjacent silicon atoms. If silicon atoms are replaced with atoms with five electrons for bonding, this produces:

a n-type material.

Silicon uses four electrons to form bonds with adjacent silicon atoms. If silicon atoms are replaced with atoms with three electrons for bonding, this produces:

a p-type material.

The output of a NOR gate is HIGH if _____.

all inputs are LOW

In a n-type material, majority carriers would be:

electrons.

To make NPN transistor in "ON" state, Base and Emitter junction must be _____ while Base and Collector junction must be _____.

forward-biased, reverse biased

Under normal conditions a diode conducts current when it is

forward-biased.

On the _____ edge of clock, D-FF change its state accordingly.

positive

Silicon is a common element found in _____ and is _____ percent of the Earth's crust.

sand, 28%

The result for subtracting 1000 from 1110 is _____.

0110

What is the result of the following operation: 101110 - 1101 =

100001

Find the sum of the binary numbers 1011 + 0110 =

10001

Find the 2's complement of the binary number 010011.

101101

Add the following binary numbers and convert result to decimal: 101011 + 111011 =

102

Give the decimal value of binary 10000110.

134

Give the decimal value of binary 10010.

18

The decimal value for the binary number 101101 is _____.

45

What is the sum (in decimal) of below operation: 101011 + 101101 =

88

Subtract the following binary numbers and convert results to decimal: 1110101 - 11001 =

92

If the output of a three-input AND gate must a logic LOW, what must the condition of the inputs be?

?

Logically, the output of a NOR gate would have the same Boolean expression as a(n):

?

The inputs of first operation at D-FF reported Clk = 1 and D = 0. Second operation reported Clk = 0 and D = 0. What would be the output state (Q) at the second operation?

?

What would be a "Set" state logic inputs for SR latch?

?

Which of the following is not a basic Boolean operation?

FOR

The full adder consists of the following logic gates

XOR, AND, and OR.

The result for subtracting 1010 from 0101 is _____.

-0101

What are the symbols used to represent digits in the binary number system?

0,1

Emitter and Base junction (VBE) requires _____ v to activate this junction into ON state.

0.7

In electronic circuit, a transistor acts as

A & B

The output of an OR gate with three inputs, A, B, and C, is LOW when

A = 0, B = 0, C = 0.

Which statement best describes a semiconductor? - A material with very few free electrons. - A material with many free electrons. - A material with many free holes. - A material doped to have some free electrons.

A material doped to have some free electrons.

This truth table applies to a(n)

AND gate

Logically, the output of a NAND gate would have the same Boolean expression as a(n):

AND gate immediately followed by an inverter.

Digital systems require that voltage levels change between high and low.

True

In electronic technology, a digital voltage has a discrete set of values.

True

In a transistor, collector current is controlled by:

base current.

When PN junction diode is connected in forward-biased, the Depletion region:

becomes the narrower.

When PN junction diode is connected in reverse-biased, the Depletion region:

becomes wider.

An off-biased diode has the _____ connected to the positive side of the battery, and the _____ connected to the negative side of the battery.

cathode, anode

Triode is an enhancement device of diode structure in which _____ is added to _____.

control grid, control electrons movement

The movement of free electrons in a conductor is called

current.

Most of the electrons in the base of a bipolar junction transistor flow

into the collector.

A PN-junction diode acts as a:

switch.

The output of a NOT gate is HIGH when _____.

the input is LOW

The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):

truth table.

Binary systems in electronic technology have _____.

two states