Question: Iron losses in a specimen of iron are determined by using co-ordinate type of potentiometer. The loss component of no load current is ready by :
Answer:
MCQ: Iron losses in a specimen of iron are determined by using co-ordinate type of potentiometer. The loss component of no load current is ready by :
Correct Answer:
A. Inphase potentiometer
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Related Questions
- 1. The iron loss when measured in the specimen of laminations at a constant maximum flux density of 1.3 Wb/m<sup>2</sup> are : 20W at 40 Hz and 40 W a 60 Hz. What are the hysteresis and eddy current losses at 50Hz and a flux density of 1.3 Wb/m<sup>2</sup> ?
- 2. Magnetizing force is measured by nuclear magnetic resonance method. The expression for magnetizing force is_________Where f = frequency in Hz,h = planck’s constant andv<sub>p </sub> = gyrometric ratio.
- 3. Permanent magnets are tested by :
- 4. The optical spectrum has wavelengths ranging from :
- 5. The visible spectrum has wavelengths ranging from :
- 6. A certain emissive material has a work function of 2.24eV, the radiations emitted from it will have threshold length of approximately :
- 7. In order that photoelectric emission to be possible over whole of the visible spectrum of 370 nm – 770 nm, the work function of the photoemission surface should be approximately :
- 8. When a light beam is made incident on a surface which is rough as compared with the wavelength of light
- 9. Radiometry refers to measurement of optical radiations
- 10. The response of human eyes under normal light conditions is called
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