CET Study Guide Questions and Answers Rated A+, Exams of Electronics

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CET Study Guide Questions and

Answers Rated A+

The "1" in binary number carries a decimal weight of ___________. ✔✔ 32

Which of these is within tolerance for a resistor that is color coded red, black, red and gold? ✔✔2000 and 1900 ohm's

Which would be the most likely cause of hum in an amplifier- but only when it is switched to the CD position? ✔✔Bad shielded cable from the CD to the amplifier input

When measuring power to a speaker, a doubling of the power represents a 3 dB increase. ✔✔True

A voltmeter that converts AC to DC by rectifying the voltage would be used to indicate the correct value of measured _______. ✔✔Sine waves

Regarding PC's, what does "RAM" mean? ✔✔Random Access memory

What is the binary number for decimal number 6? ✔✔ 0110

In order for a capacitor to function as a coupling capacitor, Xc, must be less than ______ at the lowest frequency at which the AC circuit is operating. ✔✔0.1 R

The term for the combination of resistance and reactance that restricts the flow of alternating current is _______. ✔✔Impedance

Adding the binary numbers 110111 and 001101 will give which one of these results? ✔✔ 1000100

How should a fuse be installed in a circuit to ensure proper operation? ✔✔In series with the load

A lead-acid battery cell, when charged, has a nominal value of ________. ✔✔3.4 volts

Common analog telephone lines, on hook, may be expected to have what DC voltage level on one of the wires? ✔✔-48 v

A dual-trace scope has ___________. ✔✔Two vertical inputs

What determines the velocity factor in a transmission line? ✔✔the dielectric material of the line

As the input frequency to an operational amplifier increases over a broad frequency range (e.g. 1kHz to 1gHz), the output signal level usually ________. ✔✔decreases

Total power in a series circuit is determined by the _________. ✔✔Source voltage multiplied by the current

Integrated circuit failures often exhibit ____________. ✔✔Audible noise

Which of the following circuit configurations has the same amount of voltage drop across each of its components? ✔✔parallel

The Y axis of an oscilloscope is used to measure ✔✔amplitude

When replacing a DIP chip, ____________. ✔✔Use ESD static grounded soldering pencil or work station

What is the equivalent to microwatts? ✔✔0.1 milliwatts

Oscillators use quartz crystals. What effect do these crystals show? ✔✔Piezoelectric effect

Prior to connecting an analog voltmeter into a DC circuit, what should be observed? ✔✔polarity

An audio amplifier has severe hum whether CD, AUX, FM, or AM radio are selected. What is the most likely cause? ✔✔Power supply filtering is bad

The voltage rating of a capacitor _______________. ✔✔Relates to the maximum voltage that should be applied to it

Total capacitance of capacitors connected in parallel is like _____________. ✔✔resistors connected in series

You would choose an LCD (liquid crystal display) if you needed ________________. ✔✔A low-current display

What is the effect on a varactor (varicap) when the reverse bias is increased? ✔✔capacitance decreases and the tuned frequency increases

Hexadecimal 2E is equivalent to a decimal number _____________. ✔✔ 46

Cables of different impedances may be combined for short runs. ✔✔false

In a parallel RLC, what voltage is applied across each branch? ✔✔total circuit voltage

Distortion in an audio amplifier occurs when _____________. ✔✔an amplifier stage input signal level is too high

What happens to current flow in a capacitive circuit as the charging voltage to a capacitor approaches full charge? ✔✔Little current flows

The capacitance of a capcitor______ if the distance between the plates decreases while all other properties of a capacitor remain the same. ✔✔Increases

Carbon microphones are much like variable ________. ✔✔resistors

What radio receiver section determines an AM radio's inherent noise level? ✔✔RF

Which of the following would be best test frequency for general audio troubleshooting? ✔✔1kHz

An inductor with the same length of wire but whose coils are spaced further apart will have ________________. ✔✔Less inductance

A length of coaxial cable used for computers, radio or television signals, is open at both ends. With an ohm meter, the resistance from the center conductor to the shield is 80 ohms. What does this indicate? ✔✔The cable is partially shorted

What is the purpose of a coupling capacitor? ✔✔To pass the AC signal while isolating the DC part of the circuit

If a co-worker is found unconscious due to electrical shock, after insuring any hazard is removed and verifying there is no danger you should then ________. ✔✔If qualified, properly administer CPR after seeking medical assistance

Instead of using a direct (X1) probe on an oscilloscope, using an X10 probe has what effect on a circuit test? ✔✔It decreases circuit loading

A 4.8 V battery cell delivers a current of 3A through an external resistance of 1.2 ohms. Calculate the internal resistance in ohms. ✔✔0.

A negative temperature coefficient thermistor will______________. ✔✔decrease in resistance with heat

A test plan should contain which of the following? ✔✔all of the above

The video amplifier for a TV receiver or radar will have a frequency response of ___________________. ✔✔0Hz - 4MHz

Diode semiconductors are marked with a band at the __________ end. ✔✔Cathode

The +5V level of a TTL digital signal is also most frequently called a logical ______________. ✔✔1 or high

A logic pulser can be used as a ____________. ✔✔Pulse generator

Waveguides are not utilized at VHF or UHF frequencies because _____________. ✔✔large waveguide dimensions as required at lower frequencies are not practical