Related Questions

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
In an LC oscillator, the frequency of oscillator is ___________ L or C.
A Proportional to square of
B Directly proportional to
C Independent of the values of
D Inversely proportional to square root of
In a radio receiver, we generally use ___________ oscillator as a local oscillator
A Crystal
B Wien-bridge
C Phase-shift
D Hartley
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 oscillations in a synchronous motor can be damped out by
A maintaining constant excitation
B running the motor on leading power factors
C providing damper bars in the rotor pole faces
D oscillations cannot be damped
A second condition for oscillations is ___________
A A gain of 1 around the feedback loop
B No gain around the feedback loop
C The attention of the feedback circuit must be one-third
D The feedback circuit must be capacitive
সরল ছন্দিত স্পন্দন ( simple harmonic oscillator)- এর ক্ষেত্রে কোনটি সঠিক সমীকরণ?
A     d2xdy2+w2x=0 
B     d2xdy2+w2y=0
C d2xdt2+w2t=0 
D    d2xdt2+ ϖ2x=0
The controlled oscillator synthesizer is sometimes preferred over the direct one because
A It is a simpler piece of equipment
B Its frequency stability is better
C It does not require crystal oscillator
D It is relatively free of spurious frequency
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
In a transmitter ___________ oscillator is used
A Hartley
B RC phase-shift
C Wien-bridge
D Crystal

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