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Everything I didn't know from the CET Practice Test 2
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Terms in this set (48)
What components value is measured in millihenries?
Inductor
If a series circuit has three resistors valued at 10k Ohms, 15k Ohms and 20k Ohms, with a voltage source of 15V, the total current will be_____.
333.33uA
Current in a parallel circuit is:
inversely proportional to the circuits resistance.
With three 2.5k resistors and one 3.4k resistor in parallel, the total resistance is:
669.29 Ohms
Given a battery rated at 350 ampere-hours how many hours will the battery be able to provide 7 amperes?
50
The basic properties associated with alternating voltage and current are:
frequency, period, wavelength and amplitude.
In an inductor/coil inductance varies as the _______ of the number of turns.
Square
What is the total inductance of the circuit below?
4.24H
What is meant by "transformer action"?
The transfer of energy from one circuit to another circuit by electromagnetic induction
In the circuit below, what is the voltage output at letter "X", when input voltage is 25V?
10V
Given the series capacitive circuit below, what is the total capacitance?
.008uF
Calculate the capacitive reactance for 440 Hz and 9µF.
40.21 Ohms
What is the difference between calculating impedance for a series AC circuit and a parallel AC circuit?
A series impedance calculation is derived from resistance and reactance, while parallel impedance is calculated with resistive and reactive current divided into the source voltage
In a series resistive and reactive circuit what formula is used to find total impedance?
Z =sqrt( R2 + X2)
To properly bias the NPN transistor below, which voltages are correct?
E = -1; B = +1; C = +10
Using ohm's law for the circuit below, calculate the total power.
166.6 mW
In the circuit below, what is the calculated power for R3.
43.2W
In the circuit below, what is the current across R2?
2A
What is the voltage at terminal 'A' for the Wheatstone bridge below?
1.86V
What formula is used to properly calculate 'Vout' for the voltage divider below?
Vout = (R2/R2+R1) * Vin
In the circuit below, what is the value of R2?
75.75 ohms
When compared to a JFET, the base of a bipolar transistor is similar to what element of the JFET?
Gate
A MOSFET is comprised of what four elements?
Gate, source, drain and substrate
A thyristor is a semiconductor with _____ layers that form ____ PN junctions.
4,3
Calculate total impedance for the circuit below.
979.93 ohms
Calculate the voltage drop across C1.
4.7V
What is Iz for the circuit below?
5A
When calculating power levels, which formula is correct?
dB=10*log(P1/P2)
-3dBm is equal to how many milliwatts?
.5mW
The formula to calculate dBm from mW is:
10 log10( P / 1mW)
What is the resonant frequency for the circuit below?
75 kHz
What is one way to minimize parasitic oscillations?
Place a swamping resistor across the transformer
In a class 'C'collector:
collector current flows for less than one half cycle of the input signal.
What is the radix of the hexadecimal number system?
16
What is the hexadecimal equivalent of the decimal number 622?
26E
What is the decimal sum of 10010 and 11001?
43
What is the digital gate equivalent for the circuit below?
NOR
Which truth table is correct for the following logic diagram?
A (table not answer)
If an oscilloscopes TIME/DIV is set at .2 microseconds, and the width of the pulse measured is at 8 divisions on the scope graticule, what is the pulse width?
1.6 microseconds
The coaxial cable leading to a cable TV is a 75 ohm transmission line. If you use 10Base2 coax cable for networking, that is a _____ ohm transmission line.
50
What four methods are used in coupling amplifier stages?
Direct, RC, impedance and transformer coupling
What formula is used to calculate output voltage of a Difference operational amplifier?
Vout = (Rf/Rin)(V2 - V1)
Opening and closing vinyl envelopes used to carry work instructions, with 10-20% relative humidity, electro-static voltages can reach as high as:
7,000V
What is the modulus of a five-stage binary counter?
32
What does LEC stand for?
Local Exchange Carrier
What are the three fundamental types of wireless access technologies?
FDMA, CDMA and TDMA
In the kinescope, the ________ intensity of an electron beam from an electron gun is modulated in accordance with the ________ variations of signals received by a control electrode, or modulator.
current, amplitude
The 4-meter frequency band is also known as the _____ band.
70 MHz
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