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CETa [REVAMPED] QUESTIONS AND 100% CORRECT ANSWERS
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CETa [REVAMPED] QUESTIONS AND 100% CORRECT ANSWERSA length of coaxial cable used for computers, radio or television signals is open at both
ends. Using 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
B. The cable is open
C. That reading is correct for 72 ohms impedance cables.
D. That reading will be higher than 72 ohms resistance, depending on the length of the
cable. - ANSWER A) The cable is partially shorted
The transistor configuration in the figure above is ____.
A. PNP
B. NPN
C. PNPN
D. NPNP - ANSWER B. NPN
An oscilloscope's Y axis is used for measuring ____.
A. Depth
B. Intensity
C. Amplitude
D. Frequency - ANSWER C. Amplitude
Which one of the following will make a generator produce DC voltage instead of AC
voltage?
,The brushes
The armature loops
The commutator
The external load - ANSWER The commutator
A 4.8 V battery cell supplies a current of 3 A through and external resistance of 1.2
ohms. Calculate the internal resistance in ohms.
0.04
0.4
4
40 - ANSWER 0.4
(load voltage drop = 3A X 1.2 ohms = 3.6 v 4.8v-3.6/3A =0 .4 ohms)
Which of the following would be the best test frequency for general audio
troubleshooting.
20 cycles per second
1 KHz
20 KHz
100 KHz - ANSWER 1 KHz
An audio amplifier has severe hum whether CD, AUX, FM or AM RADIO are selected.
What is most likely cause?
Volume control is defective
Output transistor IC is open
Power cord is bad
Power supply filtering is bad - ANSWER 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 ______.
Increases
Decreases
Remains the same
Increases the frequency. - ANSWER Decreases
In the circuit shown, to reproduce the square wave input more faithfully at the output
______.
Decrease the value of the resistor
Lower the frequency of the square wave
Decrease the value of the capacitor
Increase the value of the resistor - ANSWER Increase the value of the resistor
Where should a fuse be placed in a circuit so that there would be proper functioning?
Parallel to the load
In series with the load
Anyway
At the ground point - ANSWER In series with the load
What is the logical _______ level that a TTL digital signal is most frequency called at the
+5V level?
0 or low
0 or high
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