How long does it take to get a master's degree in Mechanical engineering?

Write short notes on: (any four) a) Suspended ground floor b) Soil exploration c) Baulking of sand d) Bearing capacity of soil e

vredina [299]

Answer:

a) A suspended floor is a ground floor with a void underneath the structure. The floor can be formed in various ways, using timber joists, precast concrete panels, block and beam system or cast in-situ with reinforced concrete. However, the floor structure is supported by external and internal walls.

b) Soil exploration consists of determining the profile of the natural soil deposits at the site, taking the soil samples and determining the engineering properties of soils using laboratory tests as well as in-situ testing methods

c) Bulking in sand Occurs When dry sand interacts with the atmospheric moisture. Presence of moisture content forms a thin layer around sand particles. This layer generates the force which makes particles to move aside to each other. This results in the increase of the volume of sand.

d) In a nutshell, bearing capacity is the capacity of soil to support the loads that are applied to the ground above. It depends primarily on the type of soil, its shear strength and its density. It also depends on the depth of embedment of the load – the deeper it is founded, the greater the bearing capacity.

Explanation:

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6 0

2 years ago

Create a set of questions a company designing a new motorcycle for a younger audience might want to ask external customers to ma

Brut [27]

Answer:

Who would pay for my product or service?

Who has already bought from me?

Am I overestimating my reach?.

What does my network think?.

Am I making assumptions based on my personal knowledge and experience?

What's my revenue model

How will I sell my product or service?

How did my competitors get started?

How will I find my customers?

Is there room to expand my target market?

3 0

2 years ago

A magician claims that he/she has invented a novel, super-fantastic heat engine. This engine operates between two reservoirs of

Marysya12 [62]

Answer:

A) Not possible, B) Posible, C) Possible, D) Not possible.

Explanation:

The maximum theoretical efficiency for any thermal engine is defined by Carnot's cycle, whose energy efficiency ( $\eta$ ), no unit, is expressed below:

$\eta = 1-\frac{T_{L}}{T_{H}}$ (1)

Where:

$T_{L}$ - Cold reservoir temperature, in Kelvin.

$T_{H}$ - Hot reservoir temperature, in Kelvin.

If we know that $T_{L} = 250\,K$ and $T_{H} = 750\,K$ , then the maximum theoretical efficiency for the thermal engine is:

$\eta = 1-\frac{T_{L}}{T_{H}}$

$\eta = 0.667$

For real thermal engines, the following inequation is observed:

$0 \le \eta_{r} \le \eta$ (2)

Where $\eta_{r}$ is the efficiency of the real heat engine, no unit.

There are two possible criteria to determine if a given heat engine is real:

Efficiency

$\eta_{r} = 1 - \frac{Q_{L}}{Q_{H}}$ (3)

Where:

$Q_{L}$ - Heat rejected to the cold reservoir, in kilojoules.

$Q_{H}$ - Heat received from the hot reservoir, in kilojoules.

Power output

$W = Q_{H}-Q_{L}$ (4)

Where $W$ is the power output, in kilojoules.

Now we proceed to verify each case:

A) $Q_{H} = 900\,kJ$ , $Q_{L} = 600\,kJ$ , $W_{m} = 400\,kJ$

$\eta_{r} = 0.333$

$0 \le \eta_{r} \le \eta$

$W = 300\,kJ$

$W \ne W_{m}$

This engine is not possible.

B) $Q_{H} = 900\,kJ$ , $Q_{L} = 500\,kJ$ , $W_{m} = 400\,kJ$

$\eta_{r} = 0.444$

$0 \le \eta_{r} \le \eta$

$W = 400\,kJ$

$W = W_{m}$

The engine is possible.

C) $Q_{H} = 900\,kJ$ , $Q_{L} = 300\,kJ$ , $W_{m} = 600\,kJ$

$\eta_{r} = 0.667$

$0 \le \eta_{r} \le \eta$

$W = 600\,kJ$

$W = W_{m}$

The engine is possible.

D) $Q_{H} = 900\,kJ$ , $Q_{L} = 100\,kJ$ , $W_{m} = 800\,kJ$

$\eta_{r} = 0.889$

$\eta_{r} > \eta$

$W = 800\,kJ$

$W = W_{m}$

The engine is possible.

7 0

2 years ago

Calculate the resistance of a lamp if the current through it is 0.4 A and the voltage across it is 8 V.

Papessa [141]

Answer:

Answer is 3.2 Ω (Ohms)

Explanation:

From Ohms Law I = V/R

R = V(I)

R = 8(0.4)

R = 3.2

6 0

2 years ago

Question 1 The first choice for how to reduce or eliminate a hazard is: a) Engineering controls b) Workplace controls c) Persona

Umnica [9.8K]

Answer:

a) Engineering controls.

Explanation:

Hazard can be defined as any agent or source that has the potential to constitute danger and cause harm, damage or adverse bodily injuries, health effects on a vulnerable individual, property or group of people.

Generally, can be classified into various categories such as mechanical, biological, chemical, physical, psychosocial and ergonomic hazard. These hazards are either human induced or natural.

Some examples of hazard are radiation, fire, flood, chemicals, drought, vapor or steam, exposed live wire, dust particles, electrical circuits and equipments etc.

The first choice for how to reduce or eliminate a hazard is engineering controls. Engineering controls of hazards involves the process of protecting, shielding or guarding individuals by eliminating the agent of hazards or through the use of barriers between the hazard and the vulnerable individual or group of people.

Basically, engineering controls when properly designed, maintained and used effectively would help to mitigate hazards and keep the work environment relatively safe for workers.

Examples of engineering controls are;

1. Ventilation systems.

2. Machine or equipment guards.

3. Radiation shields.

4. Safety interlocks.

5. Sound dampening equipments.

4 0

2 years ago