The crystal oscillator frequency is very stable due to ___________ of the crystal

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

If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient

A

Positive

B

Zero

C

Negative

D

None of the above

The application where one would most likely find a crystal oscillator is ___________

A

Radio receiver

B

Radio transmitter

C

AF sweep generator

D

None of the above

An important limitation of a crystal oscillator is ___________

A

Its low output

B

Its high Q

C

Less availability of quartz crystal

D

Its high output

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

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

The crystal oscillator frequency is very stable due to ___________ of the crystal

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