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Verizon [17]
3 years ago
5

In the context of mechanical systems, what does the term efficiency mean? OA the factor by which a machine multiplies a force B.

the ratio of a machine's power to the force of its input Ос. the rate at which a machine performs work D. the rate at which a machine consumes energy E. the ratio of the work output of a machine to the work input​
Engineering
1 answer:
bija089 [108]3 years ago
4 0

Answer:

E

Explanation:

I have a big brain and I just took the test and got it correct.

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5. Switch a in the circuit has been open for a long time and switch b has been closed for a long time. Switch a is closed at t =
andriy [413]

Answer:

(a) 1/L∫Vdt; integral t [0,1]

(b) 1/L∫Vdt; integral t [ 1, infinity]

Explanation:

An Inductor current I, flowing through an inductor depends on the voltage, V, across the inductor and the inductance, L, of the inductor. The switch 1, 2 timing varies the voltage V with time t

The expression for inductor current is given as:

I= 1/L∫Vdt,

where I is equal to the current flowing through the inductor, L is equal to the inductance of the inductor, and V is equal to the voltage across the inductor.

The formula can also be written as:

I= I0 + 1/L∫Vdt, where I is inductor current at time t, and io is inductor current at t = 0. Time can be varied by controlling the switch

8 0
4 years ago
To convert from the U.S. Customary (FPS) system of units to the SI system of units. A first-year engineering student records thr
LenaWriter [7]

This question is incomplete, the complete question is;

To convert from the U.S. Customary (FPS) system of units to the SI system of units. A first-year engineering student records three separate measurements as 653 lb, 69.0 mi/h, and 293 × 10⁶ ft². Suppose this engineering student has to turn in the results, but the professor only accepts results given in SI units.  

Required:

What is the area measurement, 293 × 10⁶ ft², in SI units?

293 × 10⁶ ft² = ?km²

Answer:

the area measurement is  27.221 km²

Explanation:

Given the data in the question;

What is the area measurement, 293 × 10⁶ ft², in SI units

we are to the result of the measured area from ft² to km²

we know that;

1 meter = 3.2808 ft

1 km = 1000 m

1 ft = (1 / 3.2808)m

1 m = ( 1/1000 ) km

since our measured are is 293 × 10⁶ ft²

hence

A = 293 × 10⁶ × [ (1 / 3.2808)m ]²

A = 27221252.74 m²

A = 27221252.74 × [ ( 1/1000 ) km ]²

A = 27.221 km²

Therefore, the area measurement is  27.221 km²

7 0
3 years ago
Sơ đồ nguyên lý của một hệ thống lạnh
Kobotan [32]

Answer:

A = 5h (B + b); solve for B.

2

7 0
3 years ago
Hydrogen enters the turbine of an Ericsson cycle at 1040 K, 5 bar with a mass flow rate of 1 kg/s. At the inlet to the compresso
andrew11 [14]

Answer:

a)

Calculate the net power developed by using

the following relation:

Wste=W-W.

Substitute 8728 kw for w, and 2846 kw for w..

Wyle=8728 - 2846

= 5882 kW

Therefore, the net power developed is 5882 kW).

Comment

Step 6 of 7 A

Calculate the thermal efficiency by using the

following relation:

Here, e, is the heat input.

Substitute w, for ..

w

Substitute s882 kw for ws and 8728 kw for w.

5882

1-8728

67.39%

Therefore, the thermal efficiency is 67.39%).

Comments (3)

Step 7 of 7 A

Calculate the back work ratio.

bwr =

Substitute 8728 kw for w, and 2846 kw for w..

bwr - 2846

bwr=8728

=0.326

Therefore, the back work ratio is 10.326).

Explanation:

7 0
3 years ago
A design that is found to have flaws and must be redesigned and retested is an example of what
Aleksandr [31]

Answer:

A. prototype

Explanation:

7 0
4 years ago
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