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The teacher of Priti's school took the students on a study trip to a power generating station…
The teacher of Priti's school took the students on a study trip to a power generating station, located nearly 250 km away from the city. The teacher explained that electrical energy is transmitted over such a long distance to their city, in the form of alternating current (ac) raised to a high voltage. At the receiving end in the city, the voltage is reduced to operate the devices. As a result, the power loss is reduced. Priti listened to the teacher and asked questions about how the ac is converted to a higher or lower voltage.
(i)[1.0]
What is the device used to change the alternating voltage to a higher or lower value?
- (a)Transformer
- (b)Rectifier
- (c)Ammeter
- (d)Voltmeter
(ii)[1.0]
What is the cause for power dissipation in the device referred to above?
- (a)Hysteresis
- (b)Eddy current
- (c)Flux loss
- (d)All of these
(iii)[1.0]
In the device used above, what is the relation between the power output and power input for an ideal case?
- (a)Power output is less than power input.
- (b)Power output is greater than power input
- (c)Power output is equal to power input.
- (d)It depends upon the situation
(iv)[1.0]
What source input should be used in this device?
- (a)A C source
- (b)D C source
- (c)Half wave rectifier
- (d)Full wave rectifier
Answer
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From ISC 2022 Specimen Physics Paper 1, question 50.