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101.

For single frequency value, the most sensitive detector is ________(a) tuned detector(b) vibration galvanometer(c) headphone(d) oscillatorI got this question in final exam.Enquiry is from Introduction to AC Bridges in section Measurement of Inductance and Capacitance of Electrical Measurements

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The correct answer is (a) tuned detector

To explain: Vibration GALVANOMETER is used for DETECTING the balance condition. Oscillator is used as a source of supply voltage. Tuned detector is the most SENSITIVE detector for a single FREQUENCY value.

102.

What is the frequency range for a headphone as a detector?(a) 20 Hz to 20 kHz(b) 10 kHz to 1 MHz(c) 10 MHz to 1 GHz(d) 250 Hz to 4 kHzThe question was posed to me in an interview.My doubt is from Introduction to AC Bridges topic in portion Measurement of Inductance and Capacitance of Electrical Measurements

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The correct option is (d) 250 Hz to 4 kHz

Easiest explanation: Headphones can be USED as detectors in AC bridges in the low AUDIO frequency range. Low audio frequency range varies from 250 Hz to 4 KHz.

103.

Commonly used balance detectors for AC bridges are headphones, tuned amplifiers and vibration galvanometers.(a) True(b) FalseThe question was asked in an interview.Asked question is from Introduction to AC Bridges topic in portion Measurement of Inductance and Capacitance of Electrical Measurements

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Correct answer is (a) True

The EXPLANATION is: Headphones, tuned amplifier circuits and vibration galvanometers are used for detecting the BALANCE CONDITION in AC bridges.

104.

At high frequency, source consists of ________(a) amplifiers(b) regulators(c) oscillators(d) op ampsI got this question in an online quiz.This is a very interesting question from Introduction to AC Bridges in division Measurement of Inductance and Capacitance of Electrical Measurements

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Correct ANSWER is (c) oscillators

Easy explanation: Op AMPS are BASICALLY differential amplifiers. Amplifiers are used in analog CIRCUITS for increasing the strength of the SIGNAL. Electronic oscillators form sources at high frequencies.

105.

Source is ________(a) dc supply(b) ac supply(c) mixed mode supply(d) high voltage supplyI got this question in my homework.My enquiry is from Introduction to AC Bridges topic in section Measurement of Inductance and Capacitance of Electrical Measurements

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The CORRECT OPTION is (b) AC supply

The EXPLANATION is: For an AC bridge we require an AC supply as the source of VOLTAGE. It supplies AC voltage at the required frequency.

106.

In the simplest form, an AC bridge consists of ____________(a) arms, source and a detector(b) arms and source(c) source and detector(d) arms and detectorThe question was asked during a job interview.My question comes from Introduction to AC Bridges in portion Measurement of Inductance and Capacitance of Electrical Measurements

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Right ANSWER is (a) arms, source and a DETECTOR

To explain I WOULD say: In its simplest form, an AC bridge consists of four arms, a source for excitation and a null detector. The source is CONNECTED across a pair of arms while the detector is connected to the pair of opposite arms.