Question

The AC system is preferred to DC system because
(a) AC voltage can be easily changed in magnitude
(b) DC motor angular velocity is effected badly
(c) High voltage AC transmission is less efficient
(d) Domestic appliances require AC voltage for the​

Answer 1

Answer:

a. AC magnitude can be easily changed in magnitude

Explanation:

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Answer 2

Answer:

The right answer for the given question is option (a): AC voltages can be easily changed in magnitude.

Explanation:

• Current can be categorized into two types :

1. Alternating current (AC), in which flowing current changes its direction.
2. Direct current (DC), in which the current flows in only one direction.

• Some home appliances need only AC power to work which is directly delivered by the power grid to households. example - lamp, refrigerator.
• But not all devices in our household uses AC power, some of them like the control panel of a coffee machine or washing machine need DC as well to function.
• In DC motor, the torque and an angular velocity have a linear relationship, i.e, During maximum torque angular velocity is zero.
• But when it comes to transmission and distribution, AC is highly preferred over DC.
• AC voltages can easily be changed from high voltage to low voltage and vice versa according to requirements during transmission and distribution.
• Moreover AC transmission line can transfer bulk power more than DC.
• Even the cost and maintenance of AC power plant is less than DC power plant.

So, even after all of the advantages of the DC system, AC is still preferred over DC because AC voltages can be easily changed which helps in power transmission and distribution.