Q.1.
It is possible to increase the maximum range of a radar equipment by
Q.2.
A high-power microwave pulse of the order of megawatts can be generated by a
Q.3.
In a pulsed radar set, the STC circuit is used to
Q.4.
Which causes multipath or frequency selective fading?
Q.5.
If k-factor is greater than 1, the array beam is bent
Q.6.
___________ is a microwave device in which the frequency of operation is determined by the biasing field strength.
Q.7.
In a___________ oscillator, the RF wave travels along the helix from the collector towards the electron gun.
Q.8.
___________ is a single cavity klystron tube that operates as on oscillator by using a reflector electrode after the cavity.
Q.9.
To prevent an IMPATT diode from burning, a constant bias source is used to maintain__________ at safe limit.
Q.10.
A class B amplifier consists of___________ transistors in order to conduct the input signal over the entire cycle.
Q.11.
______________amplifiers are linear circuits, where the transistor is biased to conduct over the entire range of the input signal cycle.
Q.12.
In transistor oscillators, FET and BJT are used. Instability is achieved by:
Q.13.
In transistor oscillators, the requirement of a negative resistance device is satisfied using a varactor diode.
Q.14.
To achieve stable oscillation, Zin + ZL=0 is the only necessary and sufficient condition to be satisfied by the microwave oscillator.
Q.15.
For achieving steady state oscillation, the condition to be satisfied in terms of reflection coefficients is:
Q.16.
In a microwave oscillator, a load of 50+is connected across a negative resistance device of impedance -50-50j. Steady state oscillation is not achieved in the oscillator.
Q.17.
Any device with negative impedance as its characteristic property can be called:
Q.18.
The equivalent circuit of a quartz crystal has LCR arm capacitance of 12nF and inductance of 3mH and parallel arm capacitance of 4nF. Parallel resonant frequency for the circuit is:
Q.19.
Parallel resonant frequency of quartz crystal is given by:
Q.20.
In the equivalent circuit of a quartz crystal, LCR arm has an inductance of 4 mH and capacitor has a value of 4nF, then the series resonant frequency of the oscillator is: