12. The main advantage of grid-leak bias over other types is that grid-leak bias
a. requires only a resistor and capacitor in parallel with the input load.
b. can develop a high bias voltage without using a separate voltage source.
c. remains stable even though excitation may vary.
d. protects the tube even when excitation fails.
13. Cathode bias is often combined with grid-leak bias in electron-tube circuits.
This is to insure
a. that the tube will have a stable cutoff point.
b. that there is sufficient bias to cut the tube off.
c. that the tube is protected if one method of bias should fail.
d. that if one type of bias fails the circuit will continue normal operation.
14. Interference from key clicks can be kept to a minimum by the use of
b. primary keying.
c. cathode keying.
d. blocked-grid keying.
15. Keying a CW transmitter may cause the transmission of undesirable noise.
a. slowing down the transmission speed.
b. removing hazardous voltage from the key terminals.
c. retarding the rise and fall in the current that forms the dots and dashes.
CHECK YOUR ANSWERS WITH LESSON 1 SOLUTION SHEET, PAGES 41 AND 42.