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Quiz 5
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Q.1
In microwave oscillators, negative resistance transistors and diodes are used in order to generate oscillations in the circuit.
true
false
Q.2
If SWR=1.5 with a wavelength of 4 cm and the distance between load and first minima is 1.48cm, then the reflection coefficient is:
0.0126+j0.1996
0.0128
0.26+j0.16
none of the mentioned
Q.3
The klystron tube used in a klystron amplifier is a type beam amplifier.
linear beam
crossed field
parallel field
none of the mentioned
Q.4
In crossed field tubes, the electron beam traverses the length of the tube and is parallel to the electric field.
true
false
Q.5
A major disadvantage of klystron amplifier is:
low power gain
low bandwidth
high source power
design complexity
Q.6
Magnetrons are microwave devices that offer very high efficiencies of about 80%.
true
false
Q.7
Klystron amplifiers have high noise output as compared to crossed field amplifiers.
true
false
Q.8
2 IMPEDANCE MATCHING
swr, first voltage minimum
swr, first voltage maximum
characteristic impedance, first voltage minimum
characteristic impedance, first voltage maximum
Q.9
High gain is not achievable at microwave frequencies using BJT amplifiers because:
device construction
complex architecture
ports are not matched at high frequencies
none of the mentioned
Q.10
The transfer function of an RF oscillator is given by:
a/ (1-ah (ω))
a/ (1+ah (ω))
a/ (-1+ah (ω))
1/ (1-ah (ω))
Q.11
A major advantage of differential amplifiers is:
high gain
low input impedance
higher output voltage swing
none of the mentioned
Q.12
Along with a differential amplifier,hybrid is used both at the input and output.
true
false
Q.13
is a non linear circuit that converts DC power to an AC waveform of desired frequency based on the oscillator design.
attenuator
amplifier
oscillator
none of the mentioned
Q.14
In conventional amplifiers, a flat gain response is achieved at the cost of reduced gain. But this drawback can be overcome by using:
balanced amplifiers
distributed amplifiers
differential amplifiers
none of the mentioned
Q.15
The criterion on which oscillations are produced in the oscillator circuit is called:
shannon’s criteria
barkhausen criteria
colpitts criteria
none of the mentioned
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