BASIC 
ELECTRONICS COURSE 
Page 39 INDEX
TEST 4


This test comes with the answers "hidden" at the end of each question. Simply roll your mouse over the word "Answer" and the answer will appear. 
It is best to write each answer on paper before checking the result - to prevent being distracted by the answer. 
Each question has a value of 1 mark. You should get a score of 20 - 25 as this is the third or fourth time you are being questioned on similar material. Constant testing is how you reinforce your understanding. 
The next test, number 5 is very similar to this one. If you are not happy with the mark you get in this test, go over the theory pages again and try Test 5.          

Question 1: What is the value of a resistor with the following colour bands:
               brown-black-green-gold:

Question 2: What are the colour bands for a 470k   5%   resistor:

Question 3: Draw a 47k and 100k in series (include colour bands).  What is the combined resistance: Draw a 47k and 100k in series (include colour bands).  What is the combined resistance:

Question 4: Name a reason why resistors are connected in series: Name a reason why resistors are connected in series:

Question 5: Draw an NPN transistor with a collector LOAD resistor and an input and output capacitor:

Question 6: Draw a 100n capacitor in parallel with 10n:

Question 7: Why are capacitors connected in parallel:

Question 8: What is the value of 100n connected in parallel with 10n:

Question 9: Draw an NPN EMITTER-FOLLOWER:

Question 10: Draw a transistor driving a LED:

Question 11: Draw an NPN emitter-follower transistor driving a LED:

Question 12: Draw the NAND gate and determine the output when both inputs are HIGH:

Question 13: Draw the XOR gate and determine the output when both inputs are HIGH:

Question 14: If the output is LOW when both inputs are HIGH, for the two gates above, why have two different gates? 

Question 15: Draw a Schmitt Trigger Inverter:

Question 16: Draw a Schmitt Trigger oscillator driving a LED:

Question 17: Draw a Low-frequency Schmitt Trigger oscillator gating a High-frequency 
                        Schmitt Trigger
oscillator:

Question 18: In the circuit for question 17, when is the diode 'gating" the second oscillator:
                      (a) When the first oscillator is HIGH   (b) When the first oscillator is LOW. 

Question 19: For the circuit in question 17, how can you make the LED flash 4 or 5 times then
                           stay on, then flash 4 or 5 times and repeat the cycle?

Question 20:  What is the voltmeter detecting?

Question 21: Connect the coil to the transistor so that 1mV detected by the coil, will be amplified:


Question 22: In question 21, what is the purpose of the base bias resistor:

Question 23: When two transistors are connected together directly (i.e. without capacitors),
                the circuit is said to be:   (a) AC coupled      (b) DC coupled

Question 24: In question 23 above, what do the letters DC stand for?
Question 25: A High current is present in a circuit. Does that also mean a high voltage is
                       present?

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