a. C.
c.
E.
b. D.
d.
G.
13. Assume that the power amplifier in an FM transmitter is driven by a 16-watt
signal. The grid draws a current of 18 ma, and the grid bias is -75 volts. For
optimum operation, the values of the grid-tank circuit components should be chosen
to present an impedance that is
a. less than 10K.
b. between 10K and 100K.
c. between 100K and 1 megohm.
d. greater than 1 megohm.
14. Cross-neutralization of a push-pull amplifier causes an increase in the
output capacitance which, in turn, limits the operating frequency. Assume that the
push-pull amplifier shown in A of figure 74, TM 11-668, has the values grid-cathode
capacitance -6.5 pf, plate-cathode capacitance = 5.5 pf, grid-plate capacitance =
14.5 pf. The INCREASE in output capacitance caused by the neutralizing capacitors
is
a. less than 10 pf.
b. between 10 pf and 15 pf.
c. between 15 pf and 20 pf.
d. greater than 20 pf.
15. Sketch A in figure 77 of TM 11-668 shows an ideally tuned power amplifier.
Assume that the unloaded QO of the tank circuit (L1 -C1) is 200, the operating Q
(QL) is 10, and the value of XL1 is 1,500 ohms.
The impedance presented to tie
amplifier under load is
a. less than 1K.
b. between 1K and 10K.
c. between 10K and 20K.
d. greater than 20K.
16. Transistors used in multiplier stages should have
a
good
high-frequency
response, a high collector dissipation rating, and a high
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