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CET EXAM QUESTIONS AND ANSWERS
ALREADY PASSED
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? ✔✔A. THE CABLE IS PARTIALLY SHORTED
The transistor configuration shown in the figure is ✔✔B. NPN
The Y axis of an oscilloscope is used to measure ✔✔C. AMPLITUDE
Which one of the following will cause a generator to produce DC voltage rather than AC voltage? ✔✔C. THE COMMUTATOR
A 4.8 V battery cell delivers a current of # A through an external resistance of 1.2 ohms. Calculate the internal resistance in ohms. ✔✔B. 0.
Which of the following would be the best test frequency for general audio troubleshooting. ✔✔B. 1 KILOHERTZ
An audio amplifier has severe hum whether CD, AUX, FM or AM RADIO are selected. What is the most likely cause? ✔✔D. POWER SUPPLY FILTERING IS BAD
As the input frequency to an operational amplifier increases over a broad frequency range (e.g 1KHz to 1GHz), the output signal level usually ✔✔B. DECREASES
In the circuit shown, to reproduce the square wave input more faithfully at the output ✔✔D. INCREASE THE VALUE OF THE RESISTOR
How should a fuse be installed in a circuit to ensure proper operation? ✔✔B. IN SERIES WITH THE LOAD
The +5 level of a TTL digital signal is also most frequently called a logical. ✔✔C. 1 OR HIGH
What number is the pin designated by the arrow in the figure? ✔✔C. 12
Common analog telephone line, on hook, may be expected to have what DC voltage level on one... ✔✔C. -48 VOLTS
The sine wave shown in the figure is at what frequency? ✔✔A. 500 HERTZ
Carbon microphones are much like variable ✔✔B. RESISTORS
What is wrong with the circuit depicted in the figure? ✔✔D. ONE OF THE DIODE GROUNDS IS WRONG.
The video amplifier for a TV receiver or radar will have a frequency response of ✔✔C. O HERTZ - 4 MEGAHERTZ
Total power in a series circuit is determined by the ✔✔A. SOURCE VOLTAGE MULTIPLIED BY THE CURRENT
When replacing a DIP chip ✔✔B. USE A ESD STATIC GROUNDED SOLDERING PENCIL OR WORK STATION.
What is the effect on a varactor(varicap) when the reverse bias voltage is increased? ✔✔A. CAPACITANCE DECREASES AND THE TUNED FREQUENCY INCREASES
What determines the velocity factor in a transmission line? ✔✔C. THE DIELECTRIC MATERIAL OF THE LINE
You should choose an LCD (Liquid Crystal Display) if you needed ✔✔C. A LOW-CURRENT DIGITAL DISPLAY
Which of the following wires has the greatest cross-sectional area? ✔✔A. 9 AWG
What is the purpose of a coupling capacitor? ✔✔A. TO PASS THE AC SIGNAL WHILE ISOLATING THE DC PART OF THE CIRCUIT
Prior to connecting an analog voltmeter into a DC circuit, what should be observed? ✔✔C. POLARITY
Of the following, which most determines the value of a capacitor? ✔✔A. SIZE OF THE PLATES
What is the binary number for decimal number 6? ✔✔D. 0110
In the drawing provided, what is the combined reactance of the two capacitors in series ✔✔A. Approximately 1.194 OHMS
What is the equivalent to 100 microwatts? ✔✔A. 0.1 milliwatts
A power supply that is being serviced is found to have several 250 mfd capacitors connected in parallel. To avoid shock from the retained charge after disconnecting the power, these capacitors ✔✔C. Should be discharged to chasis ground, with a suitable resistor.
In the following operational amplifier block diagram, which input is inverting ✔✔A. A
Which of the following might be used as a key element in DC motor electronic speed controls? ✔✔A. Delta Coil
If a co-worker is found unconscious due to an electrical shock, after insuring any hazard is removed and verifying there is no pulse, you should ✔✔D. If qualified, properly administer CPR after seeking medical help
In the figure shown, if A and B are low and C and D are high, what is the output level at E ✔✔B. High
Diode semiconductors are marked with a band at the _ end ✔✔A. Cathode
