Exercise :: Measurements and Instrumentation - Section 1
- Measurements and Instrumentation - Section 1
- Measurements and Instrumentation - Section 2
- Measurements and Instrumentation - Section 3
- Measurements and Instrumentation - Section 4
- Measurements and Instrumentation - Section 5
- Measurements and Instrumentation - Section 6
- Measurements and Instrumentation - Section 7
- Measurements and Instrumentation - Section 8
- Measurements and Instrumentation - Section 9
- Measurements and Instrumentation - Section 10
1. | To increase Q factor of a coil, the wire should be |
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Answer: Option C Explanation: Q is high if resistance is low. Therefore, wire should be thick. |
2. | An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is |
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Answer: Option D Explanation:
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3. | The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be |
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Answer: Option D Explanation: |
4. | In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is |
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Answer: Option B Explanation: When p.f. = 0.5, 0 = 60° and one of the wattmeters reads zero. |
5. | In a CRO which of the following is not a part of electron gun |
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Answer: Option D Explanation: Electron gun consists of cathode, grid and accelerating anode. |