In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ___________

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

An oscillator produces___________ oscillations

A

Damped

B

Undamped

C

Modulated

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

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

If Bashar can run around a ground four times in 20 minutes and Rahim can run around the same ground three times in 12 minutes, who can run around that ground more times in an hour, and how many times more can he run around ?

A

Bashar, three times more

B

Rahim , three times more

C

They both go around 12 times

D

Bashar, eight times more

Weight of Sona is four times that of Mona. Weight of Mona is 2.5 times of Hona. Weight of Hona is 1.5 times of Dhona. Weight of Dhona is 2.5 times of Rona. Who is the heaviest?

A

Mona

B

Sona

C

Hona

D

Dhona

Mr. A and Mr. B have a combined salary of Taka 1,000. If salary of A is increased by 2.5 times and salary of B is increased by 1.5 times, the combined salary would be Taka 1600. What was the original salary of B?

A

Taka 100

B

Taka 250

C

Taka 900

D

Taka 1,350

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

In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ___________

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