Question: In a Lloyd Fisher square used for determination of iron loss in a specimen of iron laminations, the current coil of the wattmeter is connected in the primary winding circuit, while the pressure coil is connected in the secondary winding circuit. This is done so that :
Answer:
MCQ: In a Lloyd Fisher square used for determination of iron loss in a specimen of iron laminations, the current coil of the wattmeter is connected in the primary winding circuit, while the pressure coil is connected in the secondary winding circuit. This is done so that :
Correct Answer:
A. The I<sup>2</sup>R losses in the current coil are not included in the wattmeter reading
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Related Questions
- 1. 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 :
- 2. 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> ?
- 3. 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.
- 4. Permanent magnets are tested by :
- 5. The optical spectrum has wavelengths ranging from :
- 6. The visible spectrum has wavelengths ranging from :
- 7. A certain emissive material has a work function of 2.24eV, the radiations emitted from it will have threshold length of approximately :
- 8. 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 :
- 9. When a light beam is made incident on a surface which is rough as compared with the wavelength of light
- 10. Radiometry refers to measurement of optical radiations
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