Home
Class 12
PHYSICS
A step-down transfomer reduces the suppl...

A step-down transfomer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is

A

1.2

B

0.83

C

0.12

D

0.9

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

A step down transformer convert a voltage of 2200 V into 220V in the transmission line. Number of turns in the primary coil is 5000. Efficiency of transformer is 90% and its output power is 8kW. Calculate (i) the number of turns in the secondary coil, (ii) input power.

In a step-down transformer the input voltage is 22 kV and the output voltage is 550 V. The ratio of the number of turns in the secondary to that in the primary is

A step-down transfdormer connected to main supply of 220 V is made to operate 11 V, 88W lamp. Calculate (i) Transformation ration and (ii) Current in the primary.

A transformer is used to light a 140 W, 24 V bulb from a 240 V AC mains. The current in the main cable is 0.7 A. find the efficiency of the transformer.

In step-up transformer the output voltage is 11 kV and the input voltage is 220 V. The ratio of number of turns of secondary to primary is:

When the plate voltage applied to a diode value is changed from 40 V to 42 V , the plate current increases from 50 mA to 60 mA . Calculate the dynamic plate resistance at the operating condition.

A transistor is operated in common emitter configuration at V_e =2 V such that a change in the base current from 100 muA to 300 mu A produces change in the collector current from 10 mA to 20 mA.The current gain is :