Home
Class 12
PHYSICS
Large transformer when used for sometime...

Large transformer when used for sometime become very hot and cooled by circulating oil the heating of the transformers is due to

A

the heating effect of the current alone

B

hysteresis loss alone

C

hysteresisi loss effect of the current

D

the intense sunligh at noon

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL I) (ASSERTION AND REASONING)|2 Videos

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL I) (PARAGRAPH QUESTIONS )|1 Videos

  • LAWS OF MOTION

    MODERN PUBLICATION|Exercise Revision test|43 Videos

  • MOCK TEST-1

    MODERN PUBLICATION|Exercise MCQs|47 Videos

Similar Questions

Explore conceptually related problems

State the underlying principle of a transformer. How is the large-scale transmission of electric energy over long distances done with the use of transformers ?

(a) Crystals of a substance their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. Name the substance and write its formula and explain the phenomenon involved. (b) name the acid and base that would be used to prepare the following salts: (i) Potassium sulphate (ii) Ammonium chloride.

A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5 Omega per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. (a) Estimate the line power loss in the form of heat. (b) How much power must the plant supply, assuming there is negligible power loss due to leakage? (c) Characterise the step up transformer at the plant.

Give reasons for the following observation: (a)The element carbon forms a very large number of compounds. (b)Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. c)Use of synthetic detergents causes pollution of water.

Crystals of a substance changed their colour on heating in a closed vessel but regained after sometime, when they were allowed to cool down. (i) Name one such substance. (ii) Explain the phenomenon involved.

(a) Write one equation each for decomposition reaction when energy is supplied in the form of : (i) heat , (ii) light. (b) Account for the following : (i) Paint is applied on iron articles. (ii) Oil and fat containing food items are flushed with nitrogen . (iii) When an iron nail kept in copper sulphate solution, blue colour of the solution fades and iron nail becomes brownish .