Quiz Questions - TEST - 07/ MAR-2026

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

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 3 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 4 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 5 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

Question 6 1 Marks

Which circuits commonly use parallel-fed Hartley oscillators?

A

Stereo amplifiers

B

Radio receivers

C

Television receivers

D

Automatic voltage stabilizers

Question 7 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 8 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 9 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 10 1 Marks

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

A

Oscillator

B

Amplifier

C

Multiplexed

D

Demodulator

Question 11 1 Marks

How to overcome the problem of frequency drift in LC oscillators?

A

Apply opposite polarity of signal

B

Provide negative feedback

C

Using high Q coils and good quality capacitors

D

Increase the supply voltage

Question 12 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 13 1 Marks

Which component filter the ripples in the rectifier circuit?

A

DIAC

B

Diode

C

TRIAC

D

Capacitor

Question 14 1 Marks

Which parameter is maintained constant in zener diode?

A

Power

B

Current

C

Voltage

D

Resistance

Question 15 1 Marks

What is the expansion of PRF related to frequency?

A

Power regulated frequency

B

Pulse repetition frequency

C

Pulse repetition frequency

D

Pulse probability frequency

Question 16 1 Marks

What is the name of the ratio of ON-time pulse to the OFF-time pulse of multivibrator?

A

Control voltage

B

Pulse repetition

C

Pulse repetition

D

Threshold comparator

Question 17 1 Marks

Which is the 3 terminal, negative voltage regulator IC?

A

LM 320

B

LM 340

C

IC 7905

D

IC 7812

Question 18 1 Marks

Why the load testing is done on the lead-acid battery?

A

Test the dimensional accuracy

B

Verify the rated power delivery

C

Measure the rated output voltage

D

Test I2R power loss in the battery cell

Question 19 1 Marks

Which method is adopted to charge a car battery with voltage rating of 2.3 V per cell?

A

Float charging method

B

Trickle charging method

C

Constant current charging method

D

Constant voltage charging method

Question 20 1 Marks

What is the percentage of sulphuric acid in electrolyte used for lead-acid batteries?

A

12%

B

25%

C

27%

D

40%

Question 21 1 Marks

Which energy is converted by the battery to produce electricity?

A

Electrical energy into light energy

B

Chemical energy into electrical energy

C

Mechanical energy into electrical energy

D

Electrical energy into mechanical energy

Question 22 1 Marks

Which material contains eight electrons in valency layer?

A

Insulators

B

Conductors

C

Semiconductors

D

Intrinsic semiconductors

Question 23 1 Marks

Which material is used as electrical insulator?

A

Gallium

B

Porcelain

C

Aluminium

D

Germanium

Question 24 1 Marks

What is the unit of electric charge?

A

Volts

B

Hertz

C

Ampere

D

Coulomb

Question 25 1 Marks

How the single strand wire is called?

A

Flexible wire

B

Twisted wire

C

Hook up wire

D

Multi strand wire