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3 years ago

Two advantages of using MCB in a house

Physics

1 answer:

Maslowich3 years ago

6 0

Here’s 3 examples:

MCB is more sensitive to current than fuse.

In case of MCB, the faulty zone of electrical circuit can be easily identified.

With MCB it is very simple to resume to the supply.

~Emmy

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A 356.3 G rock is traveling at 14.2 m/s. How much kinetic energy in joules<br> does it have?

geniusboy [140]

Answer:

Ek=35.922J

Explanation:

Ek=0.5mv^2

Ek=0.5(0.3563kg)(14.2)^2

Ek=35.922J

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2 years ago

A 14,92kw , 400 v , 400 r.p.m . Dc shunt motor draws a current of 40A when running at full-load. The moment of inertia of the ro

Lostsunrise [7]

First we determine the motor's efficiency - a ratio of the mechanical output power and the electrical input power:

$E = \frac{P_out}{P_in}=\frac{14920W}{U\cdot I}=\frac{14920W}{400V\cdot 40A}=0.93$

The output mechanical power is directly proportional to torque and angular speed. From this relationship we can isolate the torque:

$P_{out}=\tau \cdot\omega=E\cdot P_{in}=E\cdot I \cdot U\\\implies\tau = \frac{I \cdot U \cdot E}{\omega}=\frac{I\cdot U\cdot E\cdot 60}{2\pi\cdot \omega_{rpm}}$

whereby the last expression uses the angular speed in rpm units.

(a) we calculate the torque, given that the motor draws 1.2 times the rated current, i.e., 48 Amps:

$\tau = \frac{I\cdot U\cdot E\cdot 60}{2\pi\cdot \omega_{rpm}}=\frac{48A\cdot 400V\cdot0.93\cdot 60}{2\pi \cdot 400 rpm} = 426.3 Nm$

(b) use formula for the acceleration time:

$t_{start} = \frac{j\cdot \omega_{rpm}}{\frac{60}{2\pi}\cdot \tau}=\frac{7.5\frac{kg}{m^2}\cdot 400rpm}{9.55\cdot 426.3kg\frac{m^2}{s^2}}\approx 0.74s$

The startup time will be 0.74s

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3 years ago

Place the types of radiation in order of INCREASING mass.

lubasha [3.4K]

Answer & explanation:

Gamma Radiation (γ): Also called gamma rays. Gamma radiation is made of electromagnetic waves, has zero charge and mass, continuously emits heat and has the ability to ionize air and make it conductive of electric current.

Beta radiation (β): Beta rays or beta particles, are electrons, negative particles with charge - 1 and mass number 0.
Alpha radiation (α): Also called alpha particles or alpha rays, are particles charged by two protons and two neutrons. They have positive charge +2 and mass number 4.

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3 years ago

Which of these can harm the human ear?

Lina20 [59]

Answer:

fireworks

Explanation:

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3 years ago

Score:

mylen [45]

Kepler's 1st law is the law of ellipses

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3 years ago

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Two advantages of using MCB in a house​

Two advantages of using MCB in a house