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Covering of harvested fields with plant ...

Covering of harvested fields with plant litter, straw, grasses etc. in order to retain moisture is called `:`

A

Terracing

B

Mulching

C

Contour Bunding

D

Reforestation

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A fan operates at 200 volt (DC) consuming 1000W when running at full speed . It's internal wiring has resistance 1 Omega . When the fan runs at full speed , its speed becomes constant. This is because the torque due to magnetic field inside tha fan is balanced by the torque due to air resistance on the blades of the fan and torque due to friction between the fixed part and the shaft of the fan. The electrical power going into the fan is spent (i) in the internal resistance as heat, call it P_(1)(ii) in doing work against internal friction and air resistance producing heat, sound etc. call it P_(2) . When the coil of fan rotates, an emf is also induced in the coil. This opposes the external emf applied to snd the current into the fan. This emf is called back-emf,call it 'e' . Answer the following questions when the fan is running at full speed. The value of power P_(1) is

A fan operates at 200 volt (DC) consuming 1000W when running at full speed . It's internal wiring has resistance 1 Omega . When the fan runs at full speed , its speed becomes constant. This is because the torque due to magnetic field inside tha fan is balanced by the torque due to air resistance on the blades of the fan and torque due to friction between the fixed part and the shaft of the fan. The electrical power going into the fan is spent (i) in the internal resistance as heat, call it P_(1)(ii) in doing work against internal friction and air resistance producing heat, sound etc. call it P_(2) . When the coil of fan rotates, an emf is also induced in the coil. This opposes the external emf applied to snd the current into the fan. This emf is called back-emf,call it 'e' . Answer the following questions when the fan is running at full speed. The value of power P_(2) si

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VMC MODULES ENGLISH-ECOSYSTEM-IMPECCABLE
  1. Covering of harvested fields with plant litter, straw, grasses etc. in...

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  2. Which one of the following ecosystem types has the highest annual net ...

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  3. Stability of ecosystem depends upon:

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  4. Pyramid of energy in an aquatic ecosystem is

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  5. Term 'ecosystem' was coined by

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  6. which ecosystem has the highest primary productivity ?

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  7. About 70% of total global carbon is found in :

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  8. Consider the following statements concerning food chain : ( a) remov...

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  9. Which of the following ecosystem has the highest gross primary product...

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  10. Which of the following is considered as pioneer community is xerarch?

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  11. The final stable community in ecological succession is:

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  12. Which one of the following types of organisms occupy more than one tro...

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  13. In plant succession, when climax community is reached, the net product...

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  14. If a single plant species is removed from a food web then most likely

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  15. The assemblage of all the population of different species that functio...

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  16. The correct sequence of plants in a hydrosere is

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  17. The biomass available for consumption by the herbivores and the decomp...

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  18. Study the cycle shown in Fig. 12.7 and select the option which gives c...

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  19. Which one of the following is one of the characteristics of a biologi...

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  20. The plants convert light into chemical energy with a photosynthetic ef...

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  21. The 10% law of energy transfer in food chains was given by :

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