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4 years ago

Which of the following statements regarding piston rings is false? Select one: a.

1 answer:

3 0

Compression ring prevents pressurized refrigerant from blowing past the piston into the crankcase is the false statement.

Answer: Option A

Explanation:

Compression rings seal the combustion chamber from crankcase and then transfer heat to the cylinder from the piston. The piston rings are present in an internal combustion engine or steam engine with multi functions. The functions of piston rings are,

Ensuring the combustion chamber is tightly sealed as to reduce the loss of gas to crankcase .
Promoting heat transfer from the piston to cylinder wall .
Controlling engine oil consumption .
Optimizing the proper quantity of oil between piston and cylinder wall.

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A balanced bank of delta-connected capacitors is connected in parallel with the load which complex power associated with each ph

Sergio [31]

Answer:

77.2805 μF

Explanation:

Given data :

V = 2460 V

Q = 191 Kva

Calculate the size of Each capacitor

first step : calculate for the value of Xc

Q = V^2/ Xc

Xc ( capacitive reactance ) = V^2 / Q = 2460^2 / ( 191 * 10^3 ) = 31.683 Ω

Given that 1 / 2πFc = 31.683

∴ C ( size of each capacitor ) = $\frac{1}{2\pi *65 *31.683}$ = 77.2805 μF

8 0

3 years ago

The force of T = 20 N is applied to the cord of negligible mass. Determine the angular velocity of the 20-kg wheel when it has r

horrorfan [7]

Image of wheel is missing, so i attached it.

Answer:

ω = 14.95 rad/s

Explanation:

We are given;

Mass of wheel; m = 20kg

T = 20 N

k_o = 0.3 m

Since the wheel starts from rest, T1 = 0.

The mass moment of inertia of the wheel about point O is;

I_o = m(k_o)²

I_o = 20 * (0.3)²

I_o = 1.8 kg.m²

So, T2 = ½•I_o•ω²

T2 = ½ × 1.8 × ω²

T2 = 0.9ω²

Looking at the image of the wheel, it's clear that only T does the work.

Thus, distance is;

s_t = θr

Since 4 revolutions,

s_t = 4(2π) × 0.4

s_t = 3.2π

So, Energy expended = Force x Distance

Wt = T x s_t = 20 × 3.2π = 64π J

Using principle of work-energy, we have;

T1 + W = T2

Plugging in the relevant values, we have;

0 + 64π = 0.9ω²

0.9ω² = 64π

ω² = 64π/0.9

ω = √64π/0.9

ω = 14.95 rad/s

4 0

4 years ago

A spherical tank for storing gas under pressure is 25 m in diameter and is made of steel 15 mm thick. The yield point of the mat

nalin [4]

Answer:

a) (option B) 230 kPa

b) (option A) 100 N/m

Explanation:

Given:

Diameter, d = 25 m

Thicknesses, t = 15 mm

Yield point = 240 MPa

Factor of safety = 2.5

a) To find the maximum internal pressure, let's use the formula:

$\sigma l = \frac{\sigma y}{FOS} = \frac{PD}{4t}$

$\frac{\sigma y}{FOS} = \frac{PD}{4t}$

Solving for P, we have:

$P = \frac{\sigma y * 4t}{FOS * D}$

$P = \frac{240 * 4 * 15}{2.5 * 25}$

P = 230.4 kPa

≈ 230 kPa

The maximum permissible internal pressure is nearly 230kPa

b) Given:

Thickness, t = 6.35 mm

L = 203 mm

Torque, T = 8 N m

Let's find the mean Area,

mA = (l - t)²

= (203 - 6.5)²

= 38671.22mm²

≈ 0.03867 m² (converted to meters)

To find the average shear flow, let's use the formula:

$q = \frac{T}{2* mA}$

$= \frac{8}{2 * 0.03867}$

q = 103.4 N/m approximately 100N/m

The average shear force flow is most nearly 100 N/m

4 0

3 years ago

Read 2 more answers

How do robots demonstrate the modern, technological Japan? *

Alborosie

Robots demonstrate modern, technological Japan because it serves as brought economical success to Japan since it help them to build products faster and efficiently.

According to the question, we are to discuss how the robot help japan in terms of technology and modernization.

As a result of this we can see that Japan is moving forward in technology with development of robot because it makes them to build more products.

Therefore, Robot has brought economical success to Japan

Learn more about robot at:

brainly.com/question/10387419

3 0

3 years ago

Read 2 more answers

When implementing a safety and health program, management leadership does not need employee participation a True b) False Effect

sladkih [1.3K]

Answer: I have answered the questions in rephrased sentences as below;

When implementing a safety and health program, management leadership need employee participation. Effective management of worker safety and health programs has improved employee productivity and morale in the workplace.

Nearly a third of all serious occupational injuries and illnesses stem from overexertion of repetitive motion.

Training is a way for employers to provide tools to enable employees to protect themselves and others from injuries.

Under OSHA, employees are protected from discrimination when reporting a work-related injury, illness, or fatality.

Explanation: All personnel including management & employees must be directly involved when workplace HSE policies are being made & reviewed. This is because everyone in the work environment is impacted one way or the other when incidents occur.

Training & Reporting are key responsibilities of managers, employers & supervisors, so it is mandatory to be done without discrimination so as to foster employees happiness which ultimately lead to zero incidents & increased productivity & profit.

3 0

3 years ago