Multiple choice

Consider the following statements regarding Tachometer. (a) A photo-diode is being used as a frequency counter or tachometer. (b) A rotating disk is connected to a rotating shaft. The rotating disk has two hole in it. (c) A frequency counter is used to count the number of electrical pulses generated. Which of the above statements is/are true?

  1. Only (a)

  2. Only (c)

  3. Only (b)

  4. All of the above

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement (a) is false. A phototransistor is being used as a frequency counter or tachometer. Statement (b) is false. A rotating disk is connected to a rotating shaft. The rotating disk has one hole in it. Statement (c) is true. A frequency counter is used to count the number of electrical pulses generated.

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