Why is low voltage advantageous in arc welding?

Hot air at an average temperature of 100 degC flows through a 3 m long tube with an inside diameter of 60 mm. The temperature of

Arte-miy333 [17]

Answer:

$\dot Q = 912.017\,W$

Explanation:

The heat transfer rate due to convection is calculated by this formula:

$\dot Q = h_{air}\cdot A_{tube, in}\cdot (T_{air} - T_{tube})$

The output is determined by replacing terms:

$\dot Q = (20.1\,\frac{W}{m^{2}\cdot ^{\textdegree}C})\cdot (\pi )\cdot (0.06\,m)\cdot (3\,m)\cdot (100^{\textdegree}C-20^{\textdegree}C)$

$\dot Q = 912.017\,W$

6 0

3 years ago

Read 2 more answers

The demand schedules for Jones, Smith, and other buyers are shown in the table below:

Solnce55 [7]

The demand curve is the graphical representation of the relationship between the price of a good and the quantity demanded for a given period of time.

<h3>What is a demand schedule?</h3>

A demand schedule is a table which shows the quantity demanded of a good or service at different price levels.

A demand schedule can be graphed as a continuous demand curve on a chart where the Y-axis represents the price and the X-axis represents quantity.

Here, a typical representation, the price will appear on the left vertical axis, the quantity demanded on the horizontal axis.

Note that the complete information wasn't found and an overview was given.

Learn more about demand on:

brainly.com/question/1245771

#SPJ1

4 0

2 years ago

Reference sources reveal that a workpiece material has a unit horsepower of 1.6 hp/in3/min. For a turning operation, the cutting

Troyanec [42]

The question is incomplete. We have to calculate :

a). the cutting force

b). volumetric metal removal rate, MRR

c). the horsepower required at the cut

d). if the power efficiency of the machine tool is 90%, determine the motor horsepower

Solution :

Given :

Cutting velocity (v) = 500 ft/min

= 500 x 12 in/min

= 6000 in/min

Feed , f = 0.025 in/rev

Depth of cut, d = 0.2 in

b). Volumetric material removal rate, MRR = v.f.d

= 6000 x 0.025 x 0.2

= 30 $in^3 / min$

c). Horsepower required = MRR x unit horsepower

= 30 x 1.6

= 48 hp

a). Cutting force,

$F=\frac{power}{cuting \ velocity}$

$=\frac{48 \times 550}{500 /60}$ (1 hp = 550 ft lbf /sec)

= 3168 lbf

d). Machine HP required

$=\frac{HP}{\eta}$

$=\frac{48}{0.9}$

= 53.33 HP

6 0

3 years ago

How do the brushes control the amount of charging an alternator does

frozen [14]

Explanation:

Think of brushes as a sliding contact.

In an alternator the brushes provide power to the field coil which is physically mounted on the rotating shaft. They provide this direct current through two slip rings.

By controlling the power flow to the field, the power output of the alternator can be controlled. A regulator circuit is used to control the field so that the output voltage is maintained to about 13.5 to 14.5 VDC.

FUN FACT: Many brush holders have a small holes near the brush exit. When you assemble the alternator you physically push the brushes all the way into their holder and then thread a small wire through these hole. After the alternator is assembled you can pull the wire out and the brushes will snap into position.

3 0

3 years ago

Urgent!!! <br>List the assumptions that can be taken into account in torsion analysis.

krok68 [10]

Answer:

Explanation:

In the development of a torsion formula for a circular shaft, the following assumptions are made: Material of the shaft is homogeneous throughout the length of the shaft. Shaft is straight and of uniform circular cross section over its length. Torsion is constant along the length of the shaft.

5 0

3 years ago