E-PolyLearning

1. 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 detector
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Answer: (a).arms, source and a detector

2. Source is ________
a. dc supply
b. ac supply
c. mixed mode supply
d. high voltage supply
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Answer: (b).ac supply

3. At high frequency, source consists of ________
a. amplifiers
b. regulators
c. oscillators
d. op amps
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Answer: (c).oscillators

4. Commonly used balance detectors for AC bridges are headphones, tuned amplifiers and vibration galvanometers.
a. True
b. False
c. May be True or False
d. Can't say
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Answer: (a).True

5. 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 kHz
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Answer: (d).250 Hz to 4 kHz

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