What transformer secondary voltage is utilized in a center tapped circuit?
A1/2
B1/3
Cfull
D1/8
#105
Class C amplifiers are used as _____ amplifiers.
Aaudio-frequency voltage
Bradio-frequency
Caudio-frequency power
Daudio-frequency current
#106
Which provides the best frequency response?
Atransformer coupling
BRC coupling
CDirect coupling
DImpedance coupling
#107
Voltage amplifiers are operated as _____ amplifiers.
AClass A
BClass B
CClass C
DClass AB
#108
What operation results in severest distortion?
AClass C
BClass B
CClass A
DClass AB
#109
What is the typical plate efficiency of class A amplifier?
A50%
B75%
C30%
D10%
#110
For the same plate dissipation, the output power of a class B push-pull circuit is nearly _____ that of class A operation.
A2 times
B4 times
C3 times
D5 times
#111
In a push-pull power amplifier, an input transformer can be used as a _____ providing equal amplitude input signals opposite in polarity.
Aphase reversal
Bphase-splitter
Climiter
Ddiscriminator
#112
If the line frequency is 60 Hz, the output frequency of a bridge rectifier is
A30 Hz
B60 Hz
C120 Hz
D240 Hz
#113
If the input power of a half wave rectifier has a frequency of 400 Hz, then the ripple frequency will be equal to _____
A800 Hz
B200 Hz
C100 Hz
D400 Hz
#114
If the input frequency of a full-wave rectifier is 400 Hz, the ripple frequency will be _____.
Atwice as the input frequency
Bequal to the input frequency divided by two
Cquadruple of the input frequency
Dequal to a quarter of its input frequency
#115
Which of the following is true about emitter follower circuits?
Athe output signal is 180 degrees out of the phase with the input signal
Bthe output signal is in phase with the input signal
Cthe input signal is always equal to the output signal
Dan emitter follower circuit is equivalent to a common emitter connection
#116
The current gain of an emitter follower circuit is
Ahigh
Blow
Cmoderate
Dvery low
#117
When the transistors are used in video amplifiers, its main limitation is
Alow peak voltage
Bpoor frequency response
Clow peak current
Dpoor filtering of signals
#118
Impedance matching in circuit is important for _____ transfer of energy.
Aminimum
Benough
Cmaximum
Dlimited
#119
Termed as unwanted oscillation that may occur in almost any type of circuits, oscillator, amplifier, power supply, receiver and transmitters.
Awhite noise
Bparasitic oscillators
Cripples
Dpulsating dc signal
#120
Which of the items below describes an RF amplifier which amplify a weak signal voltage in relatively the same proportion as it will amplify a stronger signal voltage?