what is linear regulator?
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Answer :

•Linear regulator is use to get steady output voltage.

•Linear regulator can only step down the input voltage it can not step up input voltage.

•To get the regulated output voltage it wastes power in the form of heat.

•Below 10 watt output power the linear regulator is useful.

•The resistance of linear regulator varies according  the load to get the constant output voltage.

•Series and shunt linear regulator are the types of linear regulator.

•Linear regulator also come in the form of ICs.

•We can also use linear regulator with heat sink.

•Linear regulator is smaller in size and does not required magnetic devices like inductor and transformer.

•The shunt regulator is less efficient than series regulator.

•Linear regulator is noise free.

•The efficiency of linear regulator is low or medium.

•The efficiency of linear regulator will be high if the difference between input and output voltage is less.
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Description : What are the disadvantages of the linear regulator? how are they overcome in the switching regulator? What is continuous and discontinuous mode switching regulator?

Answer : Disadvantages of the linear regulator: Linear regulator waste power in the form of heat. Linear regulator has very low efficiency. Linear regulator cannot be used for the step ... between continuous mode and discontinuous mode switching regulator.

Description : What is regulator ? State its need.

Answer : A voltage regulator is a circuit or device designed to deliver a constant voltage at its output regardless of changes in ac supply voltage and load current. Need:- A voltage regulator is one ... unexpected result or damage one of the components in the circuit, hence voltage regulator is needed.

Description : Enlist names of regulator IC’s .

Answer : 1. Fixed Voltage Regulators IC - a. Positive voltage regulator IC’s - 78XX series eg. 7805, 7812 etc.  b. Negative voltage regulator IC’s - 79XX series eg. 7905, 7912 etc.  2. Adjustable Voltage Regulator - LM317 is example of positive adjustable voltage regulator.

Answer : It is simply variable resistance create opposition to flow of current and decrease or increase the speed of fan

Description : Describe the functional pin diagram of regulator IC 78XX and 79XX.

Answer : IC 78XX: Explanation: 78XX series of IC regulators is representative of three terminal devices that are available with several fixed positive output voltages. It has three terminals labeled ... can also use 25μF aluminum electrolytic capacitor. Values given may be increased without limit.