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Alternating Current VVI Questions | Physics VVI Objective Question Bihar Board | Bihar Board Class 12th Physics

Alternating Current VVI Questions 


Q.1. What are reactance and impedance in alternating current circuit ?

Ans:- Reactance:- In an alternating current curcuit the opposition offered by inductance coil or capacitior in the path of alternating current is called reactance. It is denoted by X, its unit is ohm. The reciprocal reactance is called susceptance. Its unit is 1/ohm. Reactance is of two types, which is inductive reactance and capacitive reactance.

Impedance:- In an alternating current curcuit theobstryction offered in path of alternating current by any two component from the group (ohmic resistance, inductance coil and capacitior.) is called impedance. It is called by Z. its unit is ohm. The reciprocal of impedance is called admittance. its unit is 1/ohm.

 

Q.2. What is transformer ?

Ans:- It is a device, which is used to increase or decrease the alternating current.

The transformers are of the following types:-

1. Step-up transformer

2. Step-down transformer.

 

Q.3. Why is core of transformer laminated ?

Ans:- The alternating magnetic flux induces eddy currents in the iron core and causes heating. The effect is reduced by having a laminated core, because of its insulation properly.

 

Q.4. Name the energy losses in a transformer ?

Ans:- Energy loss in transformers are:-

(i). Flux leakage

(ii). Resistance to the windings.

(iii). Eddy currents

(iv). Hysteresis.

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