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6 days ago

A Sampling of 409 motor Shafts from a very large production Batch shows a sample standard deviation in Diameter of 0.021 mm with

a sample mean of 9.251 mm Estimate the mean diameter of the entire batch at a %95 level of confidences?

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At what forward voltage does a diode conduct a current equal to 10,000 Is ? In terms of Is , what current flows in the same diod

pantera1 [306]

Answer:a) The forward voltage is 0.23 V

b) The current that flows

$I_{d} = (1.45*10^{12}I_{s})A$

Explanation:

The forward voltage refers to the minimum voltage required for a diode to start conducting. The formula used is given by:

a) At which forward voltage does a diode allow a current equal to 10,000 Is? In terms of Is

$I_{d} = I_{s}(e^{\frac{v_{f} }{0.025} }-1)$

Where:

Id denotes the diode current = 10000Is,

Vd stands for the forward voltage at which conduction begins,

Is indicates the saturation current.

$I_{d} = I_{s}(e^{\frac{v_{f} }{0.025} }-1)$

$10000I_{s} = I_{s}(e^{\frac{v_{f} }{0.025} }-1)$

By dividing through by Is,

$10000 = (e^{\frac{v_{f} }{0.025} }-1)$

$10000 +1= e^{\frac{v_{f} }{0.025} }$

$10001= e^{\frac{v_{f} }{0.025} }$

Taking the natural log of both sides,

$ln(10001)= {\frac{v_{f} }{0.025} }$

$9.21= {\frac{v_{f} }{0.025} }$

Multiplying through by 0.025 yields

= 0.23 V

This indicates the forward voltage at which the diode conducts a current equal to 10,000 Is is 0.23 V

b) What current flows in the same diode when the forward voltage is 0.7 V?

$I_{d} = I_{s}(e^{\frac{v_{f} }{0.025} }-1)$

$I_{d} = I_{s}(e^{\frac{0.7}{0.025} }-1)$

$I_{d} = I_{s}(1.45*10^{12} -1)$

$I_{d} = (1.45*10^{12}I_{s})A$

6 0

1 month ago

Gina is about to use a fire extinguisher on a small fire. What factor determines the type of extinguisher she should use

grin007 [323]

There are five distinct types of fire extinguishers, each identifiable by specific color codes.

Red - Water-based

Creme - Foam-based

Blue - Powder-based

Black - CO2 or carbon dioxide-based

Yellow - Wet chemical-based

The type of fire extinguisher required is determined by the class of fire being dealt with.

Class A - Combustible materials (e.g., paper, wood) Recommended extinguishers - Red, Creme, Blue, and Yellow. (Avoid using Black)

Class B - Flammable liquids (e.g., paint, petrol, alcohol) Recommended extinguishers - Creme, Blue, and Black. (Avoid using Red or Yellow)

Class C - Flammable gases (e.g., butane, methane) Recommended extinguishers - Blue (Avoid using Red, Creme, Black, or Yellow)

Class D - Flammable metals (e.g., lithium, potassium) Recommended extinguishers - Blue (Avoid using Red, Creme, Black, or Yellow)

Class F - Deep fat fryers (e.g., chip pans) Recommended extinguishers - Yellow (Avoid using Red, Creme, Blue, or Black)

Electrical - any kind of electrical device

(e.g., computers, generators) Recommended extinguishers - Blue and Black (Avoid using Red, Creme, or Yellow)

8 0

1 month ago

Read 2 more answers

An air duct heater consists of an aligned array of electrical heating elements in which the longitudinal and transverse pitches

Kisachek [356]

Answer:

a) q = 7671 W

T0 = 47.6°C

b) ΔP = 202.3 N/m²

P = 58.2 W

c) hDarray = 2 times hD of an isolated element.

Explanation:

see the image for the solution.

4 0

2 months ago