Pre E Final Exam Gr 10
The effective current flowing through a 60 - W light bulb connected to a 120 - volt AC RMS source is
0.5 A
in Fig 3-14, the four bits in the output column (top to bottom) of the truth table for the AND gate are _____
0001
6 resistors are connected in parallel. R1 is = to 10 ohms, R2 is = to 15 ohms, R3 is = to 22 ohms. R4 is = to 33 ohms, R5 is = 47 ohms and R6 is equal to 68 ohms. The voltage applied to the circuit is 12 volts DC. What is the current flowing in R1?
1.2 amperes
Decimal 10 = ______in binary
1010
3 resistors ( 20 ohms, 22 ohms, 24 ohms) are connected in series. A 9 volt direct current source is attached to the series resistors. What is the current flowing in the circuit.
136 milliamperes
A 1.8 - Meg ohm resistor is connected across a 6 volt direct current source. What is the current flowing in the circuit?
3.33 microamperes
The Binary number 0010 0010 = _____in decimal
34
A 330 Ohms resistor is connected across a 12 volt direct current source. What is the current flowing in the circuit?
36.364 milliamperes
3 resistors ( 1.5 ohms, 1.6 ohms,1.8 ohms) are connected in series. A 6 volt direct current source is attached to the series resistors. What is the total resistance of the circuit?
4.9 milliohms
_____would not increase the resistance of the wire
A lower AWG size
Fig 3-17, the output Y3 on the truth table describes the 3 input____logic function
AND
The base unit for current is the
Ampere
In a solid conductor, the current carrier is
An electron
The binary number system is sometimes called the ____system
Base 2
Elements that have many free electrons are classified as
Conductors
Decimal 14 = ______in hexadecimal
E
The binary Number 1110 0101 equals ______in hexadecimal
E5
The larger the American Standard Wire Gauge (AWG) number, the larger the wire diameter
F
A 100-volt battery is connected to a 100 ohm resistor. The current is 10 amperes
False
A megohm is an ohm times 10 times to the positive 3rd power (10^3)
False
Decimal 45 equals D@ in hexadecimal
False
Decimal 7 equals 0110 in binary
False
Demorgan's first theorem states that A + B' = A' x B'
False
Demorgan's second theorem states that A x B= A+B
False
Giga equals 1,000,ooo,ooo,000 times the base unit
False
In a parallel circuit, each resistor always carries the same current
False
In a series circuit, each resistor has the same voltage drop
False
In figure 3-2, this is the logic symbol for a NOR gate
False
Milli is the metric prefix used with ten to the negative 3rd power. (10^-3)
False
The O-V level of a digital signal is called a logic O or high
False
The binary number 0011 1000 = 54 in decimal
False
The total resistance of a parallel circuit is always greater than the largest resistor value
False
This is the logic gate for an exclusive - NOR gate
False
Two equal negative charges will attract each other
False
When a capacitors has fully charged up to the source voltage in the circuit, it acts like a short
False
ten to the zero power is zero ( 10^0)
False
in figure 3-9, when both inputs to this gate are LOW, the output is_____
HIGH
Frequency is measured in
Hertz
The number system that uses the sixteen symbols 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E and F
Hexadecimal
In Fig 3-4, if inputs A, B and C are all High, output Y will be__________
High
In fig 3-1 in input A is low then output Y will be______
High
Free electrons can be found
In the valence band
The voltage across any branch of a parallel circuit
Is equally applied to all branch conductances
In Fig 3-6, if all inputs are HiGH, output Y will be_______
Low
The boolean expression (A + B) x (C + D ) = Y is called the product of sums or ______form
Maxterm
Fig 3-17, the output Y5 on the truth table describes the 3 input____logic function
NAND
In fig 3-10, is the logic symbol for a (n) ______ gate
NAND
Products of sums Boolean expression are used to create____logic circuits
NAND - NOR
In fig 3-15, Boolean expression (a) for the _____ logic function.
OR
Maxterm Boolean expression are used to create______Logic Circuits
OR-AND
The symbol for resistance is
R
A minterm Boolean expression is sometimes also referred to as the _______form
Sum of Products
The magnitude of voltage induced in a conductor depends on 3 things
The speed of the conductor The angle at which the conductor is moving The flux density
A 100-volt battery is connected to a 1.0 ohm resistor. The current is 100 milliamperes.
True
A capacitors stores electrical charge
True
A cemf has a polarity that will oppose the force which produced the cemf
True
A charged inductor can cause a very high voltage arc across an open circuit
True
A purpose of the load is to utilize the voltage from the source
True
A sine wave continuously changes magnitude
True
An Astable multivibrator will produce a string of digital pulses
True
An atom has its outermost shell completely full. This atom is called an insulator
True
Analog signals vary gradually and continuously, while digital signals consist of discrete voltage levels
True
Capacitors can hold a hazardous charge even after the power has been turned off to the circuit
True
Capacitors oppose a change in voltage
True
Current flow is the same through all the elements of a series circuit
True
Current value depends on the number of charges moving past a point in a unit of time
True
Demorgan's theorems are useful in converting from maxterm to minterm or minterm to maxterm from of Boolean expressions
True
Electronics are the particles of a negative charge
True
In Figure 3-3, the integrated circuit pictured is referred to as a DIP (Dual - in - line package) IC
True
In a parallel circuit, the voltage drop is the same across each resistor
True
In figure 3-1 if input A is High the output Y will be low
True
Inductance is measured in a unit called the henry
True
Kilo equalls 1,000 times the base unit
True
R2 is directly in series with R3
True
Rapidly collapsing fields with inductive circuits can result in high voltages that can pose a safety hazard
True
Resistance measurements must be taken with power in the circuit turned off
True
Schematic diagrams show the electrical connections of the circuit
True
The +5 V level of a TTL digital signal is called logical 1 or high
True
The 1 in the bianry number 0001 0000 has a weight of a decimal 16
True
The abbreviation for Mega "M"
True
The coulomb is the unit of electrical charge
True
The current through an open resistor will always be zero
True
The opposition to current flow is ressistance
True
The outermost shell of an atom has only one electron. This atom is called a conductor.
True
The outermost shell of any atom contains valence electrons
True
The potential difference between two points is called voltage
True
The source voltage would be measured across an open resistor in a series circuit
True
The total resistance of two resistors in parallel is equal to the product of the 2 divided by their sum
True
The unit of resistance is the ohm
True
The voltage across a shorted resistor will always be zero
True
This is the logic symbol for an XOR gate
True
To measure current with a digital meter, you place the meter within the current path.
True
Unless otherwise indicated, AC values are assumed to be rms values
True
When one light bulb opens in a parallel circuit, all of the remaining light bulbs in that circuit remain is illuminated
True
When the input goes HIGH, current flows through the LED and it lights
True
In fig 3-17, the output Y1 on the truth table describes the 3-input______logic function
XOR
The _______ does NOT influence the resistance of the wire
winding pattern
