Question
What is the principle behind the working of a
transformer?Solution
A transformer works on Faraday's law of induction. It uses electromagnetic induction to change the voltage in alternating current (AC) circuits. A varying current in the primary coil induces a varying magnetic field, which in turn induces a current in the secondary coil. This allows voltage to be increased or decreased.
Adarsh rented a travel bike for a mountain tour. If the bike is rented for 8 hours or less, the charge is Rs. 100 per hour or Rs. 8 per km, whichever is...
The cost of a piece of diamond varies with the square of its weight. A diamond of Rs.6,084 value is cut into 3 pieces whose weights are in the ratio 3: ...
Ratio of number of book to number of pen sold by a shopkeeper is 25:18, respectively while ratio of number of pen to number of pencil sold by the same s...
- If ‘A’, ‘B’ and ‘C’ are in proportion in the given order while ‘A’ = 9 and ‘B’ = 45, then find the value of ‘C’.
A sum of Rs.9600 is to be divided among 4 brothers, 3 sisters and 2 aunts. If each sister receives twice as much as each aunt and each brother receives ...
The ratio of the pocket money of two persons ‘X’ and ‘Y’ is 7:4, respectively. ‘X’ spends 60% of his pocket money while ‘Y’ spends 50% o...
The ratio of the monthly incomes of Dinesh, Nikhil and Rohan is 64:73:81. If Dinesh’s monthly income is 10,496, then find Rohan’s annual inc...
In a class of 240 students, 20% decided to leave. From those who stayed, the ratio of boys to girls is 11:13. How many girls are currently in the class?
If the mean proportion between 98 and 8 is denoted by 'k', then determine the ratio of (k + 4) to (k - 8).
The ratio of zinc and copper in a brass pieces is 3:4. How much zinc will be there in 140 kg of such a piece?
