Quiz Questions - VARMA ITI MONTHLY TEST

Question 1 1 Marks

What is the natural shape of a quartz crystal?

A

Cylindrical shape with pyramid at ends

B

Cube shape with pyramid at ends

C

Pentagonal prism with pyramid at ends

D

Hexagonal prism with pyramid at ends

Question 2 1 Marks

Why LC tuned circuits are not used in audio frequency oscillators?

A

LC values required is too large

B

LC components are not available

C

LC tank circuit does not produce AF signals

D

LC tank circuit operation requires high voltage

Question 3 1 Marks

How many time constant period is required to fully charge a capacitor?

A

10 time constants

B

7 time constants

C

5 time constants

D

3 time constants

Question 4 1 Marks

How to improve the frequency stability in oscillator circuits?

A

Increase the supply voltage

B

By using quartz crystal

C

Using L and C

D

Improve the property of circuits

Question 5 1 Marks

What type of feed back is used by the Wein-bridge oscillator to oscillate the signal?

A

No feedback

B

Positive feedback

C

Negative feedback

D

Both positive and negative feedback

Question 6 1 Marks

What type of arrangement is required to sustain the oscillations of the oscillator circuit?

A

Provide negative feedback

B

Provide regenerative feedback

C

Increase the bias voltage

D

Increase the value of inductor

Question 7 1 Marks

Which circuits commonly use parallel-fed Hartley oscillators?

A

Stereo amplifiers

B

Radio receivers

C

Television receivers

D

Automatic voltage stabilizers

Question 8 1 Marks

What is the percentage of charge accumulated by the capacitor at the end of 2 time constant limit?

A

0.4

B

0.5

C

0.632

D

0.864

Question 9 1 Marks

Which circuit is determined by the frequency of LC tank circuit?

A

Oscillator

B

Amplifier

C

Multiplexed

D

Demodulator

Question 10 1 Marks

What is the difference of Colpitts oscillator compare to Hartley oscillator?

A

Uses split inductor

B

Uses split capacitor

C

Uses crystal oscillator

D

Uses SCR combination

Question 11 1 Marks

What is the resonant frequency range of a crystal?

A

Between 0.1 and 1MHZ

B

Between 0.1 and 10 MHZ

C

Between 0.5 and 25 MHZ

D

Between 0.5 and 30 MhZ

Question 12 1 Marks

How many time constants required to change a capacitor to 63.2% of its full charge voltage?

A

Four time constant

B

Three time constant

C

Two time constant

D

One time constant