Question 1

What is/are the advantage of MCB over fuses?

Accepted Answer

MCB has several advantages over fuse:MCB is more sensitive to current than the fuse. It detects any abnormality in the current flow and automatically switches off the electrical circuit.In the case of MCB, the fault zone of the electrical circuit can be easily identified. Faulty circuit trips to the off position. On the other hand in case of the fuse, the complete fuse wire needs to be checked by opening fuse grip for confirming the fault zone.With MCB it is very simple to resume to the supply. You just need to push the knob of MCB back to on position. But in case of the fuse, the entire fuse wire needs to be replaced.MCB provides a better interface with the help of knob than a fuse. In case of the fuse, the compete for handle needs to be taken care out.Handling MCB is electrically safer than handling a fuse.MCB is reusable and hence has less maintenance and replacement cost. Whereas a fuse needs to be replaced whenever it goes faulty.

Question 2

Why are compact fluorescent lamps (CFLs) preferred over electric bulbs?

Accepted Answer

The electrical bulb uses more electric power and also wastes electrical energy in the form of heat. Whereas compact fluorescent lamps do not waste electrical energy in the form of heat and they also consume less energy.

Question 3

Name two electric devices for each where (i) heating effect of current is used and (ii) magnetic effect of current is used.

Accepted Answer

The electric devices arei) Heating effect of current is used: Room heater and geyser.ii) Magnetic effect of current is used: Cranes and electric bell.

Question 4

Name the device used these days in place of electric fuses in electrical circuits.

Accepted Answer

The name of device is Miniature Circuit Breaker (MCB).

Question 5

Write the function of a fuse.

Accepted Answer

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Question 6

Which of the following equipment does not work on principle of Joule's law?

Accepted Answer

The electric iron, electric heater and electric bulb are some of the familiar devices based on Joule’s Law, but electric fan is not based on Joule's Law. Thus option  D  is correct.

Question 7

Which one of the following heater element is used in electric press

Accepted Answer

Heating appliances generally contain coils of high resistance wire made of nichrome alloy. When these appliances are connected to power supply by insulated copper wires then a large amount of heat is produced in the heating coils because they have high resistance.

Question 8

Which of the following is the function of MCB in household circuit?

Accepted Answer

An MCB functions by breaking the flow of electric current through the circuit once a fault is detected. In simple terms, MCB is a switch which automatically turns off when the current flowing through it passes the maximum allowable limit.A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected.

Question 9

State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?

Accepted Answer

Appliances based on heating effect of electric current are:1) Electric heater2) Electric iron3) Microwave oven4) Induction cookerFinely heated platinum wire is used in surgery rather than knife because melting point of platinum is  1768\ ^\circ C  is very high so it does not get melted easily  when heated for cutting the tissues while doing surgery.

Question 10

Can we use the same fuse in a geyser and a television set? Explain.

Accepted Answer

A geyser is used to heat water. For this reason, geyser needs a high rate of electricity. Television is used to put pixels on the screen. For this reason, television needs a low rate of electricity as compared to the geyser. So, according to the required rate of electricity we have to use different fuses in a geyser and television set.

Electric Fuse & MCB

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