Discussion Forum

Sign Up

Sign In

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

You must login to ask question.

Ask A Question

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved). Hence, explain why high voltage transmission is preferred?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.26 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 26

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Obtain the resonant frequency and Q-factor of a series LCR circuit with L = 3.0 H, C = 27 μF, and R = 7.4 Ωμ. It is desired to improve the sharpness of the resonance of the circuit by reducing its ‘fiill width at half maximum’ by a factor of 2. Suggest a suitable way.

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.21 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 21

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.23 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 23

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m³ s⁻¹. If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g = 9.8 ms⁻²).

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.24 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 24

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

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 Ω. per km. The town gets power from the line through a 4000220 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.

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.25 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 25

1 2 … 6

Obtain the resonant frequency and Q-factor of a series LCR circuit with L = 3.0 H, C = 27 μF, and R = 7.4 Ωμ. It is desired to improve the sharpness of the resonance of the circuit by reducing its ‘fiill width at half maximum’ by a factor of 2. Suggest a suitable way.

A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m³ s⁻¹. If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g = 9.8 ms⁻²).

Which is the best website providing NCERT Solutions?

NCERT Books

Where can I get NCERT books in PDF format?

NIOS

NCERT Solutions

Sign Up

Sign In

Forgot Password

Discussion Forum Latest Questions