Based on the National Electrical Code (NEC), a 450-Ampere fuse should be used to protect this polyphase (three-phase) squirrel cage inductor motor.
Given the following data:
Power rating = 100-horsepower.Voltage = 240 volt.How to determine the correct fuse rating?According to Table 430.52 of the National Electrical Code (NEC), a dual-element time delay fuse should be calculated at 175% (1.75) of the full-load current rating for an alternating current (AC) polyphase (three-phase) squirrel cage inductor motor.
In this scenario, the squirrel cage inductor motor didn't list a NEMA design code on its nameplate. Thus, we'll assume that the inductor motor is design B and its fuse rating is given by:
Fuse rating = 248 × 1.75 × 434
In conclusion, the nearest standard fuse size which is above the computed value listed in Section 240.6 of the National Electrical Code (NEC) is 450 amperes.
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A 20cm-long rod with a diameter of 0.250 cm is loaded with a 5000 N weight. If the diameter of the bar is 0.490 at this load, determine: I. the engineering stress and strain, and [2] II. the true stress and strain
If the diameter of the bar is 0.490 at this load, determine I. the engineering stress and strain, and [2] II. the true stress and strain is 1561. 84 MPa.
What is strain?Strain is a unitless degree of ways a great deal an item receives larger or smaller from an implemented load. Normal stress happens while the elongation of an item is in reaction to an everyday pressure (i.e. perpendicular to a surface), and is denoted via way of means of the Greek letter epsilon.
L = 20 cm d x 1 = 0.21 cmdx 2 = 0.25 cmF=5500 a) σ= F/A1= 5000/(π/4x(0.0025)^2)= 1018.5916 MPa lateral stress= Ad/d1= (0.0021-0.0025)/0.0025 = - 0.1 longitudinal stress (ɛ_l)= -lateral stress/v = -(-0.16)/0.3(assuming a poisson's ration of 0.3) ε_l=0.16/0.3 = 0.5333b) σ_true= σ(1+ ɛ_I)= 1018.5916(1+0.5333 = 1561.84 MPa.Read more about the diameter :
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What must the controlling contractor include in the written notification he or she provides?
A. Any repair to the crane
B. Any repair to the anchor bolts
C. Any changes to the company's human relations (HR) policies
D. Any changes to the training program
The controlling contractor includes in the written notification he or she provides A. Any repair to the crane.
What is the training program?An excessive contractor, big contractor, manufacturing manager or each different crook entity, which has the overall duty for the improvement of the project - its planning, splendid and completion."
The delivery director is described with the useful resource of the use of ASME due to the fact the birthday celebration that straight away oversees the artwork being finished with the useful resource of the use of the crane and the associated rigging crew. According to ASME B30. 5, a lift director ought to be onsite for all lifting operations.
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Tech A says that water soaked brake shoes can be a cause of brake fade. Tech B says that disc brakes dissipate heat faster than drum brakes. Who is correct
Explanation:
perturbateur ( le temps, le lieu, les personnages[description], la victime, l'enqueteur )
les peripeties
le denouement
If particleboard is used as wall sheathing, the grade mark with type _____ or _____ should be stamped on it.
If particleboard is used as wall sheathing, the grade mark with type M1 or M2 should be stamped on it.
What is particle board?Particle board is notably used as floors underlayment or as a base for parquet floors, timber floors, or for carpets. For this purpose, the particle forums are dealt with with unique chemical compounds and resins to cause them to water-resistant or termite proof.
Waferboard, OSB, and composite plywood, while carried out as wall sheathing, offer a nail base for software of shingle siding.
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Name the force acting on the handles of a plastic shopping bag that is full of groceries.
The answer is
The force acting on the handles of a plastic shopping bag that is full of groceries are gravitational force, muscular force.
Gravitational force works downwards, and muscular force is applied by the hands lifting bucket upwards. Two forces are in the opposite direction and hence balancing each other. As a result net force is zero.
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All aspects of the Kirby-Bauer test are standardized to assure reliability. What might be the consequence of pouring the plates 2mm deep instead of 4mm deep
Answer:
it would affect the distance the antiantibodies diffuse from the disk
Explanation:
What is the purpose of having a ventilation system on board a motorized vessel?.
The purpose of having a ventilation system on board a motorized vessel is : To remove flammable gas from a vessel to avoid explosions.
Meaning of ventilation systemA ventilation system can be defined as a system that allows for removal of gases from a vessel to the atmosphere.
A Ventilation system is very important in every motorized vessel because they help to eliminate or remove flammable gases that are dangerous and are liable to explode when held in a large amount in the engine.
In conclusion, The purpose of having a ventilation system on board a motorized vessel is to remove flammable gas from a vessel their by avoiding explosions.
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Zone, n = (sum of digits of your student id)% 8 for example, if your student id is 17301283, zone = (1+7+3+0+1+2+8+3) % 8 = 25 % 8 = 1 derive midpoint line drawing algorithm for a line in zone n. if you find zone 0, i.e., then drop the last digit from sum and take % 8 again. if your student id is 16240524, zone = (1+6+2+4+0+5+2+4)%8 = 24%8 = 0 updated zone by removing last digit 4 = (1+6+2+4+0+5+2)%8 =20%8 = 4 derive midpoint circle drawing algorithm for the arc of the circle in zone n. if you find zone 1, i.e., then drop the last digit from sum and take % 8 again. if your student id is 17301283, zone = (1+7+3+0+1+2+8+3)%8 = 25%8= 1 updated zone by removing last digit 3 = (1+7+3+0+1+2+8)%8 = 22%8= 6
what is difference between baseband transmission and broadband transmission
The difference between the baseband and the broadband connection is made with the transmission of signal over the frequency.
What is data transmission?The data transmission is given as the transfer of the data from one digital device to another. The transmission can take place with the baseband transmission and the broadband transmission.
The major difference between the two transmissions is that the baseband utilizes a complete frequency for transmission of signal, while the transmission with the broadband is made with multiple signals over multiple frequencies.
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Starters that are intended to protect motors that operate on 240 volts should contain ____ load contacts.
A dice is thrown 420 times and the number 6 is obtained 63 times; express the frequency of obtaining
the number 6 as a percentage.
Answer: 15%
Explanation:
Frequency of obtaining = 63/420 = 0.15 = 15%
a. 1.2KΩ =
Ωwhat is the ohms
Answer:
1200
Explanation:
ohms is the si unit for resistance.
hence, 1.2 k(ohms) = 1200 ohms since k = kilo = ×1000
A discharging lead-acid battery is best described as.
Answer: chemical cells that produce an electrical current
Explanation:
a ________________ is the flat, low-lying area adjacent to a stream channel that receives overbank flow
Answer:
flood plain
Explanation:
it should be called a flood plain which makes sense because it’s not a deposition.
which of the following elements does not affect the strength and usefulness of concrete
4.6. What is the maximum peak output voltage and current if the supply voltages are changed to +15 V and -15 V.
The maximum peak output voltage and current if the supply voltages are changed to +15 V and --1V will be 15V and 0.1A.
How to calculate the current?From the information given, the supply voltages are +15V and -15V. The maximum peak output voltage will be 15V.
The maximum peak current will be:
= 15/150
= 0.1A
In conclusion, the maximum peak output voltage and current will be 15V and 0.1A.
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If an internally piloted DCV does not shift, you should use a gauge to _____. A.check the pilot line pressure b. check the inlet pressure to the DCV c. check the outlet pressure from the DCV d. check the vacuum on the pilot line
If an internally piloted DCV does not shift, you should use a gauge to: B. check the inlet pressure to the DCV.
What is DCV?DCV is an acronym for Directional Control Valve and it can be defined as a fundamental part of pneumatic and hydraulic systems, which is designed and developed to enable fluid from one or more sources flow into different paths.
In pneumatic and hydraulic systems, you should use a gauge to check the inlet pressure to the DCV when an internally piloted DCV does not shift.
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If the piston in problem 3 had an input of 50 psi, what would the total amount of work performed by one piston be?
Answer:
Applied pressure on piston (P) = 50 psi. We know that work done is given by W = Force x displacement. S Force = Pressure x Areas > W = ( PXA ) X L W = PX ( AL ) W = PX AV = 50x 43.7088. W= 2185.
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A voltage drop test is being performed on the output wire of the alternator to the battery positive post. Technician A says that the voltage drop should be more than 0.5 volts. Technician B says that during the voltage drop test, the engine should be at the specified rpm and the battery loaded down so the alternator puts out maximum current flow. Who is correct
Assuming a voltage drop test is being performed on the output wire of the alternator to the battery positive post, the technician who would be correct is: B. Technician B.
What is a voltage drop?A voltage drop can be defined as a measure of the decrease in electrical potential in an electrical circuit, especially along the path of a current that is flowing through it.
How to calculate the amount of voltage?In order to determine the amount of voltage that is running through this circuit, we would apply Ohm's law:
V = IR
Where:
I represents the current.R represents the resistance.V represents the voltage.Assuming a voltage drop test is being performed on the output wire of the alternator to the battery positive post, the technician who would be correct is Technician B because the engine should be at the specified rpm.
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Complete Question:
A voltage drop test is being performed on the output wire of the alternator, between the alternator output wire to the battery positive post. Technician A says that the voltage drop should be approximately 12.0 volts. Technician B says that during the voltage drop test, the engine should be at the specified rpm and the battery loaded down so the alternator puts out maximum current flow. Who is correct?
A. Technician A
B. Technician B
C. Both Technician A and B
D. Neither Technician A nor B
Which of the following transducers can focus
at 6 cm ?
An example of a transducer which can focus at 6 cm is a 4 MHz, near zone length at 10 cm.
What is a transducer?A transducer can be defined as a mechanical device that is designed and developed to convert one form of energy to another.
This ultimately implies that, a transducer has the ability to convert a signal in one form of energy to a signal in another energy form such as an ultrasound transducers which converts electric energy into sound energy and vice-versa.
In conclusion, a 4 MHz, near zone length at 10 cm is an example of a transducer which can focus at 6 cm.
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A 25-horsepower, three-phase induction motor has a nameplate rating of 32 amperes. The nameplate also shows a temperature rise of 30 degrees C. What is the overload size for this motor in amperes
Based on the calculation, the overload size for this inductor motor in Amperes is equal to 40 amperes.
Given the following data:
Power rating = 25-horsepower.Nameplate rating = 32 amperes. Temperature rise = 30°C.How to determine overload size for this motor?According to Section 430.32(A)(1) of the National Electrical Code (NEC), the overload size is 125% (1.25) of the full-load current rating of a polyphase (three-phase) inductor motor.
Therefore, the overload size for this inductor motor in Amperes is given by:
Overload size = 32 × 1.25
Overload size = 40 amperes.
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How many pounds in 32 kilograms?
Answer:
it is 70 lbs...........
.
Answer:
Explanation:
The standard conversion factor for pounds and kg is 2.20462 pounds make 1 kg
This is a proportion question. A proportion consists of 2 equal ratios. If 3 of the 4 parts are known, the 4th part can be found.
Givens
1 kg = 2.20462 pounds (that's 2 of the 4 parts)
32kg = x 32 kg is our 3rd part.
Solution
1/32 = 2.20462/x Cross Multiply
x = 32*2.20462
x = 70.55 pounds rounded to the nearest hundredth
When a technician is ohming out a load in a circuit, what reading should the technician get if the load is good
When a technician is ohming out a load in a circuit, the reading that the technician should get if the load is good is some numbers.
What does Ohming out a circuit mean?The term “Ohming out a motor” is known to be the act of measuring the electrical resistance that is present in the motor windings and comparing it with the normal values.
Note that When a technician is ohming out a load in a circuit, the reading that the technician should get if the load is good is some numbers as it will tell if there is a measure of comparison or not.
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The most important reason to wear your seat belt is to protect you from:
Answer:
#1. Saves Lives. The bottom line is seatbelts save lives.
Explanation:
Most regulatory signs are?
Answer:
Most regulatory signs are square or rectangular except for STOP signs, which are octagonal, and YIELD signs, which are equilateral triangles with one point straight down.
Explanation:
Answer:
Most regulatory signs are square or rectangular except for STOP signs, which are octagonal, and YIELD signs, which are equilateral triangles with one point straight down.
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Two sides and the included angle of triangle were measured as under
A = 757.64 +0.045 m
B = 946.70+ 0.055 m
C = 54°18+25"
Based on the calculations, the area of this triangle is equal to 290,136.87 m².
Given the following data:
Side A = 757.64 +0.045 m.Side B = 946.70+ 0.055 m.Angle, C = 54°18'25"How to calculate the area of this triangle?Mathematically, the area of a triangle can be calculated by using this formula:
Area = 1/2 × b × h
Where:
b is the base area.h is the height.In this scenario, the area of this triangle is given by:
Area = 1/2 × a × b × sinC
Substituting the given parameters into the formula, we have:
Area = 1/2 × 757.64 × 946.70 × sin(54°18'25")
Area = 580,273.74/2
Area = 290,136.87 m².
Next, we would determine the probable error of the area by using this formula:
[tex]PE_A = \pm k \sqrt{PE} \\\\PE_A = \pm \frac{1}{2} \times sinC \sqrt{(aPE_b)^2 + (bPE_a)^2 } \\\\PE_A = \pm \frac{1}{2} \times sin(54^{\circ}18'25") \times \sqrt{(757.64 \times 0.045)^2 + (946.70 \times 0.055)^2 } \\\\PE_A = \pm 0.4045 \times \sqrt{1,162.39 +2,711.12}\\\\PE_A = \pm 0.4045 \times \sqrt{3,873.51}\\\\PE_A = \pm 0.4045 \times 62.2375\\\\PE_A = \pm25.1751 \;m^2[/tex]
Therefore, probable error of the area is equal to ±25.1751 m².
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Complete Question:
Two sides and the included angle of a triangle were measured and the probable error of each value were computed as follows:
A = 757.64 +0.045 m
B = 946.70+ 0.055 m
C = 54°18'25"
Determine the area of the triangle and the probable error of the area.
A visual lead of ________ seconds or 1 city block is appropriate when driving in traffic in urban areas.
The answer is
A visual lead of 12-15 seconds or 1 city block is appropriate when driving in traffic urban areas.
Urban driving involves a variety of complex driving situations.
when you driving in urban areas, look at least 12-15 seconds ahead of vehicle.
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Answer: 5
Explanation:
just took it
the diagram illustrates a method of producing plastics called
Answer:
polymerisation,
Explanation:
Gasoline and diesel fuel are made from what fossil fuel?
Answer:
they are made from petroleum
The code requires switches to be
installed at
entrance to a room.
A. every
B. every other
C.Only one
The code requires switches to be installed at every entrance to a room.
What is every?In English language, every can be defined as a determiner and it is typically used before a singular noun while referring to each of the members of a set without exception.
In this context, every is the most appropriate word to use in filling the blank because entrance is a singular noun while the room is a set.
Therefore, the code requires switches to be installed at every entrance to a room.
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