Engineering :: Mechanical Measurements
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| 131. |
Rochelle salts are used |
| A. |
For colour identification |
B. |
For photography |
| C. |
For polarisation |
D. |
As piezoelectric crystals |
| E. |
As dectors of gamma rays |
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Answer: Option D
Explanation:
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| 132. |
Which of the following is not a piezoelectric material? |
| A. |
Quarz |
B. |
Sodium chloride |
| C. |
Ammonium dihydrogen phosphate |
D. |
All of the above |
Answer: Option B
Explanation:
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| 133. |
Which of the following statement is wrong for thermocouple measuring instruments? |
| A. |
They read average values |
B. |
They read rms values |
| C. |
They cannot take overheads |
D. |
When calibrated on dc they cannot be used for ac signals |
| E. |
Their calibration dies not change with time or temperature |
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Answer: Option D
Explanation:
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| 134. |
The direction of current in case of antimony bismuth thermocouple will be |
| A. |
From antimony to bismuth at the cold junction |
B. |
From antimony to bismuth at hot junction |
| C. |
From bismuth to antimony at cold junction |
D. |
Any of the above |
| E. |
None of the above |
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Answer: Option A
Explanation:
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| 135. |
Which of the following is generally not used as a thermocouple material? |
| A. |
Platinum - Rhodium |
B. |
Chromel - Alumel |
| C. |
Gold - Silver |
D. |
Chromel - Copper |
| E. |
None of the above |
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Answer: Option C
Explanation:
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| 136. |
Which of the following thermocouple can be used for temperatures above 1000?C |
| A. |
Platinum - Rhodium |
B. |
Chromel - Alumel |
| C. |
High pressure Chromel - Copper |
D. |
Any of the above |
| E. |
None of the above |
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Answer: Option A
Explanation:
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| 137. |
The display of a digital numerical read out instrument is achieved by |
| A. |
Light emitting diodes |
B. |
Light dependent resistors |
| C. |
Photo tube |
D. |
Ionization of gases |
| E. |
Heated filaments |
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Answer: Option C
Explanation:
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| 138. |
Which of the following device can be used to give an indication for temperature changes? |
| A. |
Bourden gauge |
B. |
Thermistor |
| C. |
Thermocouple |
D. |
Transistor |
| E. |
LED |
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Answer: Option C
Explanation:
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| 139. |
Thermocouple used in radio micrometer and thermo-galvanometer is |
| A. |
Antimony - bismuth couple |
B. |
Copper constant couple |
| C. |
Copper iron couple |
D. |
Iron - copper couple |
| E. |
None of the above |
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Answer: Option A
Explanation:
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| 140. |
Thermocouples are generally used for temperature measurements upto |
Answer: Option D
Explanation:
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