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
