1- The primary and secondary winding of an ordinary 2-winding transformer always have _____?
a) different number of turns
b) same size of copper wire.
c) a common magnetic circuit.
d) separate magnetic circuit
e) none of the previou
2- In performing the short circuit test of a transformer____
a) High voltage side is usually short circuited
b) Low voltage side is usually short-circuited.
c) Any side is short circuited.
d) None of the previous.
3- A transformer has negative regulation when its load power factor____
a) Zero
b) leading
c) unity
d) lagging
e) none of the previous.
4- The voltage applied to the h.v. side of a transformer during short circuit test is 4% of its rated voltage. The core loss will be ____ percent of the rated core loss.
a) 16
b)0.16
c) 0.0016
d) 0.4
e) 0.04
f) none of the previous
Answers
The primary and secondary winding of an ordinary 2-winding transformer always has a common magnetic circuit. In performing the short circuit test of a transformer, the low voltage side is usually short-circuited. A transformer has negative regulation when its load power factor is lagging. The core loss will be 0.16 percent of the rated core loss.
The primary and secondary winding of an ordinary 2-winding transformer always has a common magnetic circuit.
In an ordinary 2-winding transformer, both the primary and secondary windings are wound on a common magnetic core. This shared magnetic circuit allows for efficient energy transfer between the primary and secondary windings through electromagnetic induction.
In performing the short circuit test of a transformer, the low voltage side is usually short-circuited.
During the short circuit test, the low voltage side of the transformer is typically short-circuited while the high voltage side is kept open. This configuration allows for measuring the impedance and losses on the low-voltage side of the transformer.
A transformer has negative regulation when its load power factor is lagging.
The regulation of a transformer refers to its ability to maintain the output voltage within specified limits as the load varies. A transformer has negative regulation when the load power factor is lagging, indicating that the load is more inductive. This results in a drop in the output voltage compared to the rated voltage.
The voltage applied to the high voltage (H.V.) side of a transformer during the short circuit test is 4% of its rated voltage. The core loss will be 0.16 percent of the rated core loss.
During the short circuit test, the rated voltage on the high voltage side of the transformer is reduced to 4% to avoid excessive current flow. The core loss is proportional to the square of the voltage applied. Therefore, with a voltage of 4% of the rated voltage, the core loss will be (0.04)^2 = 0.0016, which is 0.16% of the rated core loss.
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Related Questions
6. If the energy removed from an engine as heat during one cycle is 6.0 × 10³ J, how
much energy must be added to the engine during one cycle in order for it to
operate at 31 percent efficiency?
Answers
To solve this question, we need to use the formula for efficiency, which states that Efficiency = (Output Energy / Input Energy) x 100.
We know that the Output Energy is 6.0 × 10³ J, and we need to figure out the Input Energy. To find the Input Energy, we can rearrange the formula to Input Energy = (Output Energy / Efficiency) x 100.
Plugging in our values, we have Input Energy = (6.0 × 10³ J / 0.31) x 100 = 19.35 x 10³ J.
Therefore, the energy that must be added to the engine during one cycle in order for it to operate at 31 percent efficiency is 19.35 x 10³ J.
What type of stored energy is transferred by burning fuels
Answers
The type of stored energy that is transferred by burning fuels is chemical energy. Chemical energy is a form of potential energy that is stored within the chemical bonds of substances, such as the molecules of fuels. When fuels undergo combustion, such as the burning of gasoline, the chemical bonds within the fuel molecules are broken, and new bonds are formed.
During this chemical reaction, energy is released in the form of heat and light. The released energy is a result of the conversion of the potential energy stored in the chemical bonds of the fuel into other forms of energy, primarily thermal energy. This thermal energy can then be harnessed and used for various purposes, such as heating, generating electricity, or powering engines.
The process of burning fuels involves the oxidation of the fuel molecules, where they react with oxygen from the air. This reaction releases the stored chemical energy and converts it into thermal energy. The combustion process is exothermic, meaning it releases energy in the form of heat.
It's important to note that burning fuels also produces other byproducts, such as carbon dioxide and water vapor. These byproducts result from the chemical reactions occurring during combustion but do not directly represent the transfer of stored energy. The primary transfer of stored energy in the burning of fuels occurs through the conversion of chemical energy to thermal energy.
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The formula for speed is Total Distance / Total Time. Based on the data table below, what is the
average speed after 2 minutes? Please show all calculations.
Time (min.) Distance (m)
0
1
2
3
0
50
75
90
Answers
Answer:
To find the average speed after 2 minutes, we need to calculate the total distance covered in 2 minutes and divide it by 2.
Total Distance after 2 minutes = 75m
Total Time after 2 minutes = 2 minutes
Average Speed after 2 minutes = Total Distance / Total Time
Average Speed after 2 minutes = 75m / 2 min = 37.5 m/min
Therefore, the average speed after 2 minutes is 37.5 m/min.
I Hope This Helps!
Suppose an asteroid orbits the sun with a mean radius 11 times that of Earth. Use the simplified version of
Kepler's third law (T2= a³) to find the period of the asteroid? Round your answer to the nearest Earth year.
Answers
Answer:
36 years
Explanation:
Given the equation of Kepler's third law as T² = a³, you want to know the period of an asteroid that has an orbital radius of 11 au.
PeriodSolving the given equation for t, we find ...
T = a^(3/2) . . . . . . take the 1/2 power
Then for a=11, the period in years is ...
T = 11^(3/2) ≈ 36.48
The period of the asteroid is about 36 years.
what is the equation for net force
Answers
Answer:
Is to add all forces, for example either the gf = gravitational force
Ff= force fiction
Fn= normal force
Thus, fg + ff + fn = y will give you results
Well then the forces you use in your exercises or questions.
The equation for net force is: ΣF = ma
or, ΣF = Δp/Δt.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
A spring balance can be used to calculate the Force. Newton is the SI unit of force.
Hence, net force applied on the object = mass × acceleration
ΣF = ma
It can be written in another from as:
net force applied on the object = change in momentum ÷ time interval
ΣF = Δp/Δt
So, the equation for net force is: ΣF = ma
or, ΣF = Δp/Δt.
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this is a 3 part question6) (a) Your heart beats with a frequency of 1.45 Hz. How many beats occur in a minute? (b) If the frequency of your heartbeat increases, will the number of beats in a minute increase, decrease, or stay the same? (c) How many beats occur in a minute if the frequency increases to 1.55 Hz?
Answers
Given,
The initial frequency of the heartbeat, f₁=1.45 Hz
The increased heartbeat, f₂=1.55 Hz
The frequency of the heartbeat can be described as the number of occurence of the heartbeat per second. That is every second, the heart beats 1.45 times.
(a)
Thus for a minute, the number of the heartbeats is,
\(\begin{gathered} N_1=f_1\times60 \\ =1.45\times60=87 \end{gathered}\)Thus 87 beats occur for a minute.
(b)The increase in the frequency of the heartbeat implies the increase in the number of the heartbeat for every second. And hence the beats in a minute increase when the frequency of the heartbeat increases.
(c)
The number of the beats per minute after the increase of the frequency is,
\(\begin{gathered} N_2=f_2\times60 \\ =1.55\times60 \\ =93 \end{gathered}\)Thus after the increase in the frequency, 93 beats occur in a minute.
What is your average resting heart rate?
Answers
Answer:
from 60 to 100.
Explanation:
Normal heart rates at rest: Children ages 6 - 15 70 – 100
Adults (age 18 and over) 60 – 100
you see a displayed diver-down flag while boating. if possible, how far away must you stay from the flag?
Answers
If you see a displayed diver-down flag while boating, it is necessary to maintain a certain distance from the flag for safety reasons. The specific distance may vary depending on local regulations and circumstances, but it is generally recommended to stay at least 100 feet away from the flag.
A diver-down flag is used to indicate the presence of divers in the water. Its purpose is to alert boaters to the potential hazards and to ensure the safety of the divers. The exact distance you must stay away from the flag may be specified by local laws or regulations, so it is important to familiarize yourself with the rules of the area you are boating in.
In many places, a common guideline is to stay at least 100 feet away from the diver-down flag. This distance allows for a safe buffer zone to prevent any accidental collisions or disturbances to the divers. However, it's crucial to check and adhere to the specific regulations in your boating location, as they may vary and could require a different distance to be maintained. Prioritizing safety and respecting the presence of divers is essential to avoid any accidents or harm to both boaters and divers.
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Which of the following is an example of a luminous object?
Dog
Tree
Candle
Moon
Answers
Answer:
Candle
Explanation:
The moon is an illuminated object, while a candle is a luminous object!
Answer:
Candle
Explanation:
I just took the test
A 20 kg sled is being pulled across a horizontal force at a constant velocity the pulling force has a magnitude of 80 N and it's directed at an angle of 30° above the horizontal determine the coefficient of kinetic friction
Answers
Answer:
0.58
Explanation:
Using the frictional force formula expressed as;
\(F_f = \mu R\\\)
\(\mu\) is the coefficient of kinetic friction
R is the normal reaction
\(\mu = \frac{F_f}{R}\)
\(F_f = Wsin \theta\\R = W cos\theta\\\mu = \frac{Wsin \theta}{W cos \theta}\\\mu = \frac{sin\theta}{cos \theta} \\\mu = tan \theta\)
Given
\(\theta = 30^0\\\mu = tan 30^0\\\mu = 0.58\)
hence the coefficient of kinetic friction is 0.58
5. A student rolls a marble from a lab bench and then the marble rolls off the table. The table is 91
cm high and the marble lands 50 cm from the table.
a.
What is the minimum horizontal speed the marble needs to achieve this horizontal
distance?
b. What is the vertical velocity of the marble before it hits the ground (vertical impact
velocity)?
I
6. A water bottle has a small hole which in turn causes a small leak. The leaking water shoots out
of the side of the bottle horizontally with a speed of 2 m/s. if the water bottle is held 1.5 meters
from the ground, how far out will the water travel?
Answers
The acceleration caused by gravity, or 9.81 m/s², which acts on the object, causes the projectile's vertical velocity to vary.
What is meant by vertical velocity ?A projectile's horizontal velocity is constant (a never changing in value), Gravity causes a downward vertical acceleration with a magnitude of 9.8 m/s/s. A projectile's vertical velocity fluctuates by 9.8 m/s per second, A projectile's vertical motion exists unrelated to its horizontal motion.
The acceleration caused by gravity, or 9.81 m/s², which acts on the object, causes the projectile's vertical velocity to vary. Therefore, this choice is likewise false. As is common knowledge, an object's vertical velocity is not constant, and momentum is a function of velocity.
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Correctly label the following anatomical features of the semicircular ducts. Cupula Supporting tells Vestibular braneh CN Hair cells Crista ampullaris BEDRE Endolymph
Answers
Supporting tells: The supporting tells are the structures that support and anchor the cupula in the semicircular ducts.
Vestibular braneh: The vestibular branch is a branch of the vestibulocochlear nerve (CN VIII) that carries sensory information from the semicircular ducts to the brain.
CN: CN stands for cranial nerve, which is a group of nerves that originate in the brain and innervate various parts of the head and neck. In this context, CN VIII refers to the vestibulocochlear nerve.
Hair cells: Hair cells are sensory cells that are located in the semicircular ducts and are responsible for detecting changes in angular acceleration.
Crista ampullaris: The crista ampullaris is a ridge of sensory hair cells that is located in the ampulla of the semicircular ducts.
BEDRE: It is not clear what "BEDRE" refers to in this context. Please provide more context or clarify the term.
Endolymph: Endolymph is a fluid that is found within the inner ear and is responsible for transmitting sound and movement information to the brain. It is located within the semicircular ducts and other parts of the inner ear.
What does dalton theory have in common with democritus
Answers
Answer:
Democritus and Dalton has similar ideas about the atom, but Democritus based his theory more on reason than science. ... His ideas were similar to those of Democrites in that he believed that atoms were indivisible and that atoms of one substance are all alike but are different from atoms of another substance.
Explanation:
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Answer:
Democritus and Dalton has similar ideas about the atom, but Democritus based his theory more on reason than science. ... His ideas were similar to those of Democrites in that he believed that atoms were indivisible and that atoms of one substance are all alike but are different from atoms of another substance.
Explanation:
Which best defines gravity?
A. The tendency of objects to fall from trees
B. An attractive force between two objects due to their mass
C. The amount of matter in an object
D. The rate at which objects fall to earth
Answers
Answer:
B. An attractive force between two objects due to their mass
Explanation:
Answer:
B
Explanation:
Gravity is a force that pulls 2 objects towards each other and varies depending on mass. The earth for example is large enough to have a gravitational force that keeps us down. The sun has a gravitational force that keeps the Earth in orbit.
During a recent upset victory against New Greer Academy, South's #2 singles player, Dimitri, stepped in some mud and left the following tracks along the baseline. The point-to-point distances are:
A to B: 18.1 feet
B to C: 13.3 feet
What is Dimitri's total distance?
Distance
feet
Attempts: 0
What is the magnitude of Dimitri's displacement?
Displacement
feet
Attempts: 0
Answers
Distance can be defined as the amount of ground covered (traveled) by a physical object over a specific period of time and speed, regardless of its direction, starting point or ending point.
Mathematically, the distance traveled by a physical object can be calculated by using this formula:
Distance = speed × time
What is Dimitri's total distance?Dimitri's total distance is the sum of the distance he covered by moving from point A to B and then from B to C. Thus, his total distance is given by:
Total distance = AB + BC
Total distance = 18.1 + 13.3
Total distance = 31.4 feet.
What is the magnitude of Dimitri's displacement?The magnitude of Dimitri's displacement would be calculated by finding the difference in the position of the two point-to-point distances as follows:
Displacement = AB - BC
Displacement = 18.1 - 13.3
Displacement = 4.8 feet.
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The blackbody curve for a star named Zeta is shown below. What is the peak wavelength for this star?
impossible to tell because the scale for intensity is missing
0 nm
860 nm
3,010 nm
Answers
We are asked for the x coordinate of vertex
Here vertex is present somehow at 850-870nm
The most applicible answer should be 860nm
Option C is correct
why is black the good absorber of radiation?
Answers
Answer:
=> Black colour do not reflect the wavelength of light and is a good emitter of heat . This, black is a good absorber of radiation.
Answer:
Black coloured objects absorb all the wavelengths of light and do not reflect any of them. Therefore, it looks black in colour and is considered to be a good absorber and a good emitter of heat. On the other hand, white coloured objects reflect all the light that falls into it and therefore they look white
When hitting this golf ball, this golfer generates a velocity of 29 m/s with the club head. If the mass of the club head is 0.22
kg, what is the Kinetic energy this golfer generates?
A. 92.5 J
B. 105.7 J
C. 96.1 J
D. 84.1 J
Answers
Answer:
c.97.1j
Explanation:
yan po ang answer
Why is a pendulum hanging off another pendulum called a chaotic system?
Answers
Explanation:
If transformations from stabilization are minimal, a double pendulum performs basic geometric motion. The highly nonlinear system, furthermore, becomes radically unstable in its motion as significant displacements are introduced, showing that deterministic processes are not inherently predictable
According to Newton's third law of motion, if you push against a wall, the wall will __________.
Answers
Answer:
push up agaisnt you with equal force.
Answer:
c
Explanation:
1. In a parallel circuit a component has a potential
difference across it of 9V.
a) What would be the voltage through
the other components in the circuit?
Answers
Answer: 9 volts
Explanation:
One rule of Parallel circuits: All components share the same voltage
Water wets the tube surface and as soon as the ends of the tube are submerged, water enters the tube. When equilibrium is reached, what is the length, if any, of the air column that remains in the tube
Answers
The answer to the given question is as follows:Main answer:When equilibrium is reached, there will be no length of the air column left in the tube.Explanation:Water wets the tube surface, and as soon as the ends of the tube are submerged, water enters the tube.
The water level will rise until the water pressure at the top of the column equals the atmospheric pressure, and the air pressure inside the column equals the atmospheric pressure, at which point equilibrium is reached. Therefore, when equilibrium is reached,
there will be no length of the air column left in the tube.In short, when the water level reaches equilibrium, the length of the air column that remains in the tube is zero.
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Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
Answers
Answer:
food chain / web lol? was this a question?
Which lens combination is used to treat presbyopia ~
Answers
Answer:
People with presbyopia require a convex lens for reading glasses; specialized preparations of convex lenses usually require the services of an optometrist
can someone help me scale this into a smaller one in cm?
Answers
The resultant displacement of the bullet is 1,418.6 m.
What is the resultant displacement of the bullet?
The resultant displacement of the bullet is the total displacement of the bullet obtained by resolving the displacement into x and y component.
the horizontal component of the displacement (x) = d cosθ
the vertical component of the displacement (y) = d sinθ
where;
d is the displacementθ is the directionFor the first displacement;
x = 850 m x cos(0) = 850 m
y = 850 m x sin(0) = 0
For the second displacement;
x = 640 m x cos(36) = 517.8 m
y = 640 m x sin(36) = 376.2 m
Net horizontal and vertical displacement;
∑x = 850 m + 517.8 m = 1,367.8 m
∑y = 376.2 m + 0 = 376.2 m
The resultant displacement of the bullet is calculated as;
d = √(∑x² + ∑y²)
d = √(1,367.8² + 376.2²)
d = 1,418.6 m
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Which statement about distance and/or displacement is TRUE?
Answers
The statement that is true about distance an displacement is that a person makes a round journey, finishing where they started. The displacement for the trip is 0, and the distance is some non-zero value.
What is Distance.Distance is used to measure the path that an individual travels. If an individual moves from a point a to b the distance is measured from the point a to b.
Displacement measures any deviation or shift from where an object/ individual originally exist or stays.
The total distance covered by an individual is usually more than displacement or at times equal to displacement.
Displacement can be less than the total distance or equal to distance.
For an individual who makes a circular journey and return to the original spot there is not deviation which makes the displacement zero but the distance will be measured and recorded.
Therefore,
The displacement for the trip is 0, and the distance is some non-zero value.
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Plz help me!!!!!!!! I will give you brainliest
Answers
Which phenomenon supports the particle model of light?
A. The photoelectric effect
B. Constructive interference
C. Destructive interference
O D. Diffraction
Answers
Answer:
The photoelectric effect
The photoelectric effect supports the particle model of light. Hence option A is correct.
What is photoelectric effect ?When a substance absorbs electromagnetic radiation, a process known as the photoelectric effect causes electrically charged particles to be discharged from or inside the material. When light strikes a metal plate, the action is frequently described as the ejection of electrons from the plate. In a more general definition, the substance may be solid, liquid, or gas, the radiant energy may take the form of infrared, visible, or ultraviolet light, X-rays, or gamma rays, and the discharged particles may include ions (electrically charged atoms or molecules) in addition to electrons. Because of the perplexing concerns it presented about the nature of light—particle versus wavelike behavior—that were eventually answered by Albert Einstein in 1905, the phenomenon was critically important in the development of modern physics.
Hence option A is correct.
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What happens to cause the tissue around a cut to become swollen, red, and
painful?
A. Fluid and white blood cells move into the tissue from nearby blood
vessels.
B. White blood cells burst and release wastes made by digesting
pathogens.
C. Lymph nodes develop in the tissue and begin trapping pathogens.
D. Chemical messengers released by the tissue cause nearby
muscles to contract and pull on bones.
SUBM
Answers
Answer:
The answer is A. Fluid and white blood cells move into the tissue from nearby blood vessels.
Explanation:
Answer:
A is the Answer
Explanation:
I took the test
How has paul dirac contribution changed the ideas of their contemporaries and us?
Answers
Answer:
Dirac did more than any other scientist to reconcile Einstein's general theory of relativity to quantum mechanics. In 1933 he received the Nobel Prize in Physics, the youngest theoretical physicist ever to do so.
Explanation: