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Which of the following is used to illuminate scale in precision microptic clinometer?

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Which of the following is used to illuminate scale in precision microptic clinometer?

(a) An integral low voltage lamp

(b) An integral high voltage lamp

(c) An ordinary lamp

(d) A high voltage bulb

The question was posed to me in final exam.

This interesting question is from Clinometers topic in section Angular Measurement and Circular Division of Engineering Metrology

1 Answer

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Right choice is (a) An integral low voltage lamp

Easy explanation: The scales of precision microptic clinometer are illuminated by an integral low voltage lamp. Daylight illuminated bubble unit is present, but is also provided with a lamp. It is for alternative illumination.

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