Q.1.
Low efficiency of a power amplifier results in ___________
Q.2.
A power amplifier has comparatively ___________ ß
Q.3.
Power amplifiers generally use transformer coupling because transformer per-mits
Q.4.
What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts?
Q.5.
A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
Q.6.
The driver stage usually employs___________
Q.7.
When a transistor is cut off___________
Q.8.
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
Q.9.
If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________
Q.10.
The output stage of a multistage amplifier is also called ___________
Q.11.
A class A power amplifier uses ___________
Q.12.
The maximum efficiency of transformer coupled class A power amplifier is ___________
Q.13.
The most important consideration in power amplifier is ___________
Q.14.
The maximum collector efficiency of class B operation is ___________
Q.15.
Class C power amplifier has the highest collector efficiency
Q.16.
Power amplifiers handle ___________ signals compare to voltage amplifiers
Q.17.
The pulsating d.c. applied to power amplifier causes ___________
Q.18.
What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 O?
Q.19.
The size of a power transistor is made considerably large to ___________
Q.20.
Class ___________ operation gives the maximum distortion