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Lyrx [107]
2 years ago
15

What is the condition for maximum efficiency in a DC motor?

Engineering
1 answer:
Marysya12 [62]2 years ago
3 0

Answer:

The efficiency of a DC generator is maximum when those losses proportional to the square of the load current are equal to the constant losses of the DC generator. This relation applies equally well to all rotating machines, regardless of the type of machine.

Explanation:

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A student engineer is given a summer job to find the drag force on a new unmaned aerial vehicle that travels at a cruising speed
yan [13]

Answer:

b. 1232.08 km/hr

c. 1.02 kn

Explanation:

a) For dynamic similar conditions, the non-dimensional terms R/ρ V2 L2 and ρVL/ μ should be same for both prototype and its model. For these non-dimensional terms , R is drag force, V is velocity in m/s, μ is dynamic viscosity, ρ is density and L is length parameter.

See attachment for the remaining.

3 0
3 years ago
Which bulb has the lowest total cost of operation? (a) Incandescent (b) Fluorescent (c) LED
Finger [1]

Answer: LED have the lowest cost of operation.

Explanation:

If we ignore the initial procurement cost of the items the operational cost of any device consuming electricity is given by

Cost=Energy\times cost/unit

Among the three item's LED consumes the lowest power to give the same level of brightness as compared to the other 2 item's thus LED's shall have the lowest operational cost.

6 0
3 years ago
A new 1.2-ha suburban residential development is to be drained by a storm sewer that connects to the municipal drainage system.
valentinak56 [21]

Answer:

Time of concentration, t_d ⇒ 1280 min

Peak runoff rate, Q_p ⇒4.185 ff³/s

Explanation:

See detailed explanation

6 0
3 years ago
Select four examples of fluid or pneumatic power systems.
Dennis_Churaev [7]

Answer:

Students learn about the fundamental concepts important to fluid power, which includes both pneumatic (gas) and hydraulic (liquid) systems. Both systems contain four basic components: reservoir/receiver, pump/compressor, valve, cylinder.

Explanation:

8 0
3 years ago
Read 2 more answers
When you multiply monomials with the same variables, you multiply the coefficients and add the exponents!
RideAnS [48]

Answer: ok

Explanation:

this isn't a question?

3 0
2 years ago
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