Tag: physics

Questions Related to physics

Water gas is a mixture of -

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. $CO _2 and O _2$

  2. $O _2and H _2$

  3. $H _2, N _2 and O _2$

  4. $CO, N _2 and H _2$

Show answer
Correct Option: D
Explanation:

Water gas is produced from synthesis gas, which is composed of carbon monoxide and hydrogen

Which of the following is considered as superior quality of coal ?

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. Bituminous coal

  2. Peat

  3. Lignite

  4. Coke

Show answer
Correct Option: A
Explanation:

Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen. 

It is of higher quality than lignite coal but of poorer quality than anthracite.

Coal used in power plant is also known as -

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. steam coal

  2. charcoal

  3. coke

  4. soft coal

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Correct Option: A
Explanation:

Steam coal also known as thermal coal, is used in power stations to generate electricity. Coal is first milled to a fine powder, which increases the surface area and allows it to burn more quickly

Pulverized coal is

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. coal free from ash

  2. non-smoking coal

  3. coal which bums For long time

  4. coal broken into fine particles

Show answer
Correct Option: D
Explanation:

A Pulverized coal fired boiler is an industrial or utility boiler that generates thermal energy by burning pulverized coal (also known as powdered coal or coal dust since it is as fine as face powder in cosmetic makeup) that is blown into the firebox

Which of the following enters the super heater of a boiler ?

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. Cold water

  2. Hot water

  3. Wet steam

  4. Super-heated steam

Show answer
Correct Option: C
Explanation:

 A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Therefore, wet streams enters the super heater of a boiler. 

The efficiency of a thermal power plant improves with 

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. increased quantity of coal burnt

  2. larger quantity of water used

  3. lower load in the plant

  4. use of high steam pressures

Show answer
Correct Option: D
Explanation:

The efficiency of a thermal power plant improves with use of high steam pressures.

As steam expands in turbine-

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. its pressure increases

  2. its specific volume increases

  3. its boiling point increases

  4. its temperature increases

Show answer
Correct Option: B
Explanation:

 Specific volume is defined as the number of cubic meters occupied by one kilogram of a particular substance. When steam expands its volume increases hence its specific volume increases.

sources of energy:

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. Highly polluting

  2. Unreliable supply

  3. High running cost

  4. High waste disposal cost

Show answer
Correct Option: B
Explanation:

Unreliable supply is a disadvantage of most of renewable energy sources.

The equipment installed in power plants to reduce air pollution due to smoke is

physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

  1. Induced draft fans

  2. De-super heaters

  3. Electrostatic precipitators

  4. Re-heaters

Show answer
Correct Option: C
Explanation:

Electrostatic precipitators device that removes suspended dust particles from a gas or exhaust by applying a high-voltage electrostatic charge and collecting the particles on charged plates and used to reduce air pollution due to smoke in power plants.

Find number of solutions to the equation:$[ \sin x + \cos x ] = 3 + [ - \sin x ] + [ - \cos x ]$

physics trigonometrical ratios angles and sides naming the sides in a right angled triangle angle and their measurement

  1. 0

  2. 1

  3. 2

  4. Infinite

Show answer
Correct Option: D
Explanation:
$\sin {x}+\cos x=3-\sin x-\cos x$
$2(\sin x+\cos x)=3$
$\sin x+\cos x=1.5$
so these are infinite value of $x$ for which this equation will satisfy