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3 years ago

For high temperature deformation, the bigger the gran sine, the higher the creep rate. a)-True b)- False

Engineering

2 answers:

Gnom [1K]3 years ago

8 0

Answer:

The given statement is False.

Explanation:

This is because at high temperature the creep rate depends on grain boundary area, increasing with an increase in grain boundary area thus decreasing the grain size. Thus at higher temperatures, grain size has opposite effect , the bigger the grain size the slower the slower is the creep rate, the larger the grain boundary area.

sergiy2304 [10]3 years ago

4 0

Answer:

Explanation:

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2 years ago

In a slowly cooled hypereutectoid iron-carbon steel, the pearlite colonies are

jek_recluse [69]

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2 years ago

A household refrigerator that has a power input of 450 W and a COP of 1.5 is to cool five large watermelons, 10 kg each, to 8°C.

Andreyy89

Answer:

6222.22 sec

Explanation:

Given data the power input to the refrigerator is 450 W

The COP of refrigerator is 1.5

Temperature $T_1=8^{\circ}C$

$T_2=28^{\circ}C$

mass of watermelon =10 kg

specific heat =4.2 KJ/kg°C

The amount of heat removed from 5 watermelon

$Q=mc_pdt=5\times 10\times 4.2\times (28-8)=4200 KJ$

We know that $COP=\frac{Q_1}{W}$

$1.5=\frac{Q_1}{450}$

$Q_1=675$ W=0.675 KW

so time required to cool the watermelon is

$t=\frac{Q_1}{Q_2}=\frac{4200}{0.675}=6222.22 sec$

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3 years ago

A/an _____________ comes on if one of the dual hydraulic brake systems should fail or, in some vehicles, if the brake fluid is l

jolli1 [7]

Answer: Dash light

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3 years ago

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vladimir1956 [14]

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Further Explanation:

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