1) Johansson mickrocator is a type of
a. mechanical optical comparator
b. mechanical comparator
c. optical comparator
d. electrical comparator
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Answer
Explanation
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ANSWER: mechanical comparator
Explanation:
No explanation is available for this question!
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2) Which of the following statements are true?
1. Mechanical comparators are compact and easy to handle
2. Parallax error is never observed in mechanical comparator
3. Sigma comparator is a type of mechanical comparator
4. Mechanical comparators have low inertia which makes them sensitive to vibrations
a. 1 and 2
b. 3 and 4
c. 1 and 3
d. All of the above
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Answer
Explanation
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ANSWER: 1 and 3
Explanation:
No explanation is available for this question!
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3) Which type of comparator changes its magnification, when distance between cross strip hinge and knife edge is varied?
a. Johansson mickrocator
b. Solex pneumatic comparator
c. Projector comparator
d. Sigma comparator
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Answer
Explanation
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ANSWER: Sigma comparator
Explanation:
No explanation is available for this question!
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4) Overall magnification of optical comparators is given as
a. (4 d / f) x ( magnification of eye piece)
b. (2 f / d) x ( magnification of eye piece)
c. (4 f / d) x ( magnification of eye piece)
d. (2 d / f) x ( magnification of eye piece)
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Answer
Explanation
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ANSWER: (2 f / d) x ( magnification of eye piece)
Explanation:
No explanation is available for this question!
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5) Which principle is used to measure distance in electronic comparator?
a. Frequency modulation
b. Radio oscillations
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Both a. and b.
Explanation:
No explanation is available for this question!
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6) The sensitivity of back pressure air gauge is given by the relation shown below, what does δ R / δ p2 signify?
(δR / δt) = (δ Am / δ t) x (δ R / δ p2 ) x (δ p2 / δ Am )
a. Pneumatic sensitivity
b. Sensitivity of pressure gauge
c. Overall magnification
d. Measuring head sensitivity
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Answer
Explanation
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ANSWER: Sensitivity of pressure gauge
Explanation:
No explanation is available for this question!
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7) Calculate the range of linear scale for pressure ratios between 0.6 to 0.8. The air is supplied at 5 bar to the control jet, which has a diameter of 0.45 mm and the diameter of measuring jet is 0.83 mm.
k1 = – 0.5 & k2 = 1.1
a. 0.244 mm
b. 0.0976 mm
c. 0.0244 mm
d. None of the above
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Answer
Explanation
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ANSWER: 0.0244 mm
Explanation:
No explanation is available for this question!
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8) Internal diameter of any workpiece can be measured using
a. Solex pneumatic comparator
b. Sigma comparator
c. Johansson mickrocator
d. All of the above
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Answer
Explanation
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ANSWER: Solex pneumatic comparator
Explanation:
No explanation is available for this question!
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9) Which of the following statements is true for LVDT?
a. It is a mutual capacitive transducer
b. Presence of hysteresis gives high repeatability
c. It can measure displacement and pressure
d. All of the above
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Answer
Explanation
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ANSWER: It can measure displacement and pressure
Explanation:
No explanation is available for this question!
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10) What is the phase difference, when the system is operated at excitation frequency ?
a. Phase difference is greater than 90 o
b. Phase difference is less than 90 o
c. Phase difference is zero
d. Unpredictable
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Answer
Explanation
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ANSWER: Phase difference is zero
Explanation:
No explanation is available for this question!
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