11. For a rotameter, which one of the following statements is TRUE?
12. In an electro dynamometer, a moving coil has an area A, turn N and carries a current I producing a magnetic flux B. The torque on the moving coil is proportional to
13. An inductor tunes at 200 kHz with 624 pF capacitor and at 600 kHz with 60.4 pF capacitor. The self capacitance of the inductor would be-
14. A 1 m length wire has a resistance of 150 Ω. When it is subjected to strain, its length becomes 1.01 m. The measurement is conducted by a strain gauge whose gauge factor is 2. The change in resistance of the wire is
15. Which of the following transducers requires a high input impedance preamplifier for proper measurements?
16. The values of capacitance and inductance used in the series LCR circuit are 160 pF and 160 µH with the inherent tolerance ±10% in each. Then, the resonance frequency of the circuit is in the range of:
17. Potentiometer can be classified as:
18. In S.I system, unit of stress is:
19. If A = 629 ± 8 and B = 131 ± 3, A - B with range of doubt is
20. If an induction type energy meter runs fast, it can be slowed down by
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