In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency ___________

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 parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then ___________

A

XL decreases and XC increases

B

XL increases and XC decreases

C

Line current becomes minimum

D

None of the above

In a radio receiver, we generally use ___________ oscillator as a local oscillator

A

Crystal

B

Wien-bridge

C

Phase-shift

D

Hartley

An oscillator employs ___________ feedback

A

Positive

B

Negative

C

Neither positive nor negative

D

Data insufficient

A Wien bridge oscillator uses ___________ feedback

A

Only positive

B

Only negative

C

Both positive and negative

D

None of the above

In Colpitt's oscillator, feedback is obtained ___________

A

By magnetic induction

B

By a tickler coil

C

From the centre of split capacitors

D

None of the above

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 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

For an oscillator to properly start, the gain around the feedback loop must initially be

A

1

B

Greater than 1

C

Less than 1

D

Equal to attenuation of feedback circuit

In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency ___________

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