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Romashka-Z-Leto [24]
3 years ago
10

a) Give a brief description of the type of DC motor that operates with its field windings running in Series with the armature an

d list two (2) of its features.
Engineering
1 answer:
astraxan [27]3 years ago
5 0

Answer:

The answer to the question is:

Explanation:

The series motor or series excitation motors, is a type of direct current electric motor in which the armature and the inductor or excitation winding are connected in series. The applied voltage is constant, while the excitation field increases with the load, since the current is the same excitation current. The flow increases in proportion to the current in the armor, as the flow grows with the load, the velocity drops as that load increases.

The main features of this engine are:

- It is packed when it is idle, because the speed of a direct current motor increases as the inductor flow decreases and, in the series motor, this decreases with increasing speed, since the intensity in the inductor is the same as in the induced.

- The power is almost constant at any speed.

- The abrupt variations in the supply voltage affect it little, since an increase in this causes an increase in the intensity and, therefore, in the flow and the counter-electromotive force, stabilizing the absorbed intensity.

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If the head loss in a 30 m of length of a 75-mm-diameter pipe is 7.6 m for a given flow rate of water, what is the total drag fo
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The total head loss in a pipe is a sum of pressure head, kinetic energy head and potential energy head.

But the pipe is assumed to be horizontal and the velocity through the pipe is constant, Hence the head loss is just pressure head.

h = (P₁/ρg) - (P₂/ρg) = (P₁ - P₂)/ρg

where ρ = density of the fluid and g = acceleration due to gravity

h = ΔP/ρg

ΔP = ρgh = 1000 × 9.8 × 7.6 = 74480 Pa

Drag force over the length of the pipe = Dynamic pressure drop over the length of the pipe × Area of the pipe that the fluid is in contact with

Dynamic pressure drop over the length of the pipe = ΔP = 74480 Pa

Area of the pipe that the fluid is in contact with = 2πrL = 2π × (0.075/2) × 30 = 7.069 m²

Drag Force = 74480 × 7.069 = 526468.1 N = 526.5 KN

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