Related Questions

In a radio receiver, we generally use ___________ oscillator as a local oscillator
A Crystal
B Wien-bridge
C Phase-shift
D Hartley
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency
A To help the image frequency rejection
B To permit easier tracking
C Because otherwise an intermediate frequency could not be produced
D To allow adequate frequency coverage without switching
What is the local oscillator (mixer) frequency of the satellite with an uplink frequency in GHz band?
A 3500 MHz
B 4500 MHz
C 2225 MHz
D 2555 MHz
একটি সরল দোলকের সুতার দৈর্ঘ্য 99 cm এবং এর দোলনকাল 2 sec হলে দোলক পিন্ডের ব্যাসার্ধ নির্ণয় কর। (The length of the string and period of oscillation of a simple oscillator are 99 cm and 2 sec, respectively. Find the radius of the oscillator.)
A 1.29 cm
B 7 mm
C 3.18 mm
D 0.28 cm
E 2.15 mm
The crystal oscillator frequency is very stable due to ___________ of the crystal
A Rigidity
B Vibrations
C Low Q
D High Q
In a phase shift oscillator, the frequency determining elements are ___________
A L and C
B R, L and C
C R and C
D None of the above
___________ is a fixed frequency oscillator
A Phase-shift oscillator
B Hartely-oscillator
C Colpitt's oscillator
D Crystal oscillator
In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency ___________
A Remains the same
B Decreases
C Increases
D Insufficient data
In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ___________
A Increased 2 times
B Decreased 4 times
C Increased 4 times
D Decreased 2 times
The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to
A Reduce the spurious frequency problem
B Increase the frequency stability of the synthesizer
C Reduce the number of decades
D Reduce the number of crystals required

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