For an ideal transformer ratio of output ot the input power is always

In an ideal transformer , the primary and the secondary voltages always have

The primary coil of an ideal stepup transformer has 100 turns and the transformer ratio is also 100. The input voltage and power are 220 V and 1100 W. Calculate (i) number of turns in secondary (ii) current in primary (iii) voltage across secondary (iv) current in secondary (v) power in secondary.

A viscous clutch as shown in figure tranmits torque. Radius of each clutch plate is R and separation between the plates is a and is completely filled with liquid of coefficient of viscous mu . If omega_(i) and omega_(0) are angular velocities of plates connected to input and output respectively. If efficiency of transmission is ratio of output power to input power, then efficiency is given by

Assertion : An ideal transformer does not vary the power. Reason : An transformer is used to step-up or step-down ac voltages.

The ratio of secondary to the primary turns in a transformer is 3:2 . If the power output be P , then the input power neglecting all loses must be equal to

In a step-down transformer the turn ratio is 1:2 and output power is 2.2kW . If output current is 10A then the values of input voltage and input current.

A step down transformer converts transmission line voltage from 11000 V to 220 V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60%. If the output power is 9 kW, then the input power will be