2- When the frequency of the voltage across of a (50HZ) power transformer increased by 10% ofthe rated value, the no-load current:a) Increased.b) Decreased.c) Remains the same.3- The self-inductance of an iron-cored coil is a function of:a) The geometry of the coil only.b) The current passing through it only.c) The frequency of the applied voltage only.d) All of the above factors.

In this question, we have to write about effect of frequency on no load current and self inductance…

the no-load current: a) Increased. b) Decreased. c) Remains the same. The self-inductance of an iron-cored coil is a a) The geometry of the coil only. b) The current passing through it only. c) The frequency of the applied voltage only d) All of the above factors.

the no-load current: a) Increased. b) Decreased. c) Remains the same. The self-inductance of an iron-cored coil is a a) The geometry of the coil only. b) The current passing through it only. c) The frequency of the applied voltage only d) All of the above factors.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter3: Magnetic Starters

Section: Chapter Questions

Problem 30SQ

See similar textbooks

Related questions

Q: 6. An inductive coil with resistance R and inductance L is connected in parallel with a 500…

Q: 9 A 100-ohm resistor is connected to the secondary winding of an ideal transformer with a turns…

Q: An industrial coil has a resistance of 32 ohms and a reactance of 24 ohms and rated 440 volts at 60…

Q: A coil induces 500 mV when the current changes at the rate of 0.2 A/sec, then the value of…

A: The value of inductance is 2.5 Henry. The detailed solution is provided below.

Q: Given a two magnetically coupled coils -coefficient of coupling is 0.6 -Self-inductance L1=180µH…

Q: An air-core toroidal ring with a mean diameter of 4 cm is wound uniformly with 500 turns of a wire…

Q: The energy stored in an 1400 turns inductor is 15 Joules, if the inductance value is 1 H. Find (a)…

Q: Determine the inductance of Peterson coil to be connected between the neutral and ground to…

A: We need to determine the inductance of peterson coil to be connected between neutral and ground to…

Q: of L. 4. An impedance coil is connected in series with a 16 - ohm resistance. The combination is…

A: The Series connected resistance and inductance circuits are mostly used in : Filter design…

Q: 11. Two coupled coils have self-inductances L1 = 2 Hand L2 = 0.5 H, and a coefficient of coupling K…

A: We need to find out turn ratio for given inductance

Q: 100KVA, 200 V/ 200 kV testing transformer has 6% leakage reactance and 1% resistance. An insulator…

A: Turns Ratio Testing. Turns ratio transformer testing is regularly used to guarantee that the…

Q: An impedance coil is connected in series with a fixed resistor, and a 120-V, 50-cycle Source is then…

Q: Find i) Total number of coils i) Turns per coil i) Commutator pitch

A: Number of Poles P=4. Number of Slots S=31 Number of Coils per slots =4 Number of Conductors =496…

Q: Determine the resistance of an aluminium coil of 154 cm as diameter consists of 15400 turns and the…

Q: Two coils A and B having 1200 and 800 turns respectively are placed near to each other. 60% of the…

A: It is given that: Number of turns in coil A=NA=1200 TurnsNumber of turns in coil B=NB=800…

Q: Q4/ The inductor of the coil is 2uH and the 28 turns. 1. What is the diameter and length of the…

A: Given, The inductance of a coil (L)= 2 uH Number of turns (N)= 28

Q: Two coupled coils have self-inductances L1 = 2 H and L2 = 0.5 H, and a coefficient of coupling K =…

A: We need to find out turn ratio .

Q: A coil of 50 ohm resistance and of 150 mH inductance is connected in parallel with a 50 micro-farad…

A: Electrical machines can be either generator, transformer or motors. They can be either Ac machines…

Q: 11. Two coupled coils have self-inductances L1 = 2 H and L2 = 0.5 H, and a coefficient of coupling K…

A: In this question coil self inductance is given...We have to find out turn ratio because coil…

Q: Determine the value of self inductance of a 6 cm long air cored solenoid, if the coil has 240 turns…

Q: inductive coil with resistance R and inductance L is connected in parallel with a 40-ohm resistance.…

A: In this question we have given parallel circuit....We have to find out inductance of coil ....

Q: Q1. The primary winding of a transformer carries a distorted current having the following…

A: Since we only answer up to 3 sub-parts, we will answer the first 3. Please resubmit the question and…

Q: The mutual inductnce between two unity coupled coils of 9 H and 4 H will be ?

A: Given: Coil 1 inductance, L1 = 9 H Coil 2 inductance, L2 = 4 H As coil is unity coupled, so…

Q: (a) A Direct Current of 1 A is passed through a coil of 3500 turns and produces a flux of 0.2 mWb.…

Q: When two coils L1 and L2 are connected in series, their total inductance for aiding connection is…

A: From given details we will find out self inductance and mutual inductance.

Q: find its resistance, reactance and inductance.

Q: 5- The most effective factor on the leakage inductance of an iron-cored coil is: a) The geometry of…

A: The leakage inductance of the iron cored coil is due to the fact that the primary in not properly…

Q: A 100 kVA, 400 V/250 kV testing transformer has 8% leakage reactance and 2% resistance on 100 kVA…

Q: A coil has resistance of 5 ohm and capacitive reactance of 6 ohm . a) what is the impedance of…

A: Given: A coil has, Resistance, R=5 Ω Capacitive Reactance, XC=6 Ω

Q: A coil has a resistance of 50 ohms and a reactance of 100 ohms, is shunted by a capacitor, which has…

Q: 5. Two magnetically coupled coils have 500 and 1500 turns, respectively. When the first coil carries…

Q: A 2amp current flows through series connection of inductance L1 = 3H and L2 = 6H. If the coils are…

A: Given- Current I = 2 A, Series connection of inductance L1=3H & L2=6H, M=2H, To Find- Energy…

Q: 7. Calculate the coil inductance when a current of 4A in a coil of 800 turns produces a flux of…

A: (Q.7) Given, Current flows through a coil(I)= 4 A Number of turns (N)=800 Flux = 5 mWb

Q: A coil has an inductance of 40mH and negligible resistance. Calculate its inductive reactance and…

A: According to the question we have to find the value of inductive reactance and current.

Q: A teala coil has a primary winding rated for 11kv. If L, La and coefficient of ooupling K are 12t,…

Q: A coil with an inductance of 100 mH is connected in series with a resistance of 20 Ω. Find the…

Q: A 420-mH coil has a resistance of 10 ohms. If a 12V supply is applied to it, how long will it take…

A: To find the time required to build up 69% of maximum value

Q: An AC circuit contains a 24-Ω resistor, a 15.9-mH inductor, and a 13.3-µF capacitor connected in…

Q: In the circuit shown in the figure below, if the primary coil has the number of turns of 18, then…

A: Given circuit is - Given values are - NP=18

Q: The self inductance of a coil of 500 turns is 0.25 H. If 60% of the flux is linked with second coil…

A: Given, a coil having, N1= 500 N2= 10000 L1= 0.25 H ϕ2=0.6ϕ1 (As, 60% of the flux is linked with…

Q: a) A steady current of 4 A is flowing through an inductor with 60 volts across it. Find (i)…

Q: Q4 (ii) The secondary winding of an ideal transformer is wound with 120 turns and the primary is…

A: 4(ii). Given parameters are: Number of turns in the secondary winding of the transformer, N2=120…

Q: An inductive coil with a resistance R and inductance L is connected in parallel with a 30-ohm…

A: The solution is given below

Q: a device has an average power rating of 1200W and deisgn to operate 250V rms line. detrmine the…

Q: self-inductances L1= 2 H and L2=0.5 H, and a coefficient of

Q: Q4) Calculate the value of the impedance seen by the source if the step-up transformer turns ratio…

Q: 2- When the frequency of the voltage across of a (50HZ) power transformer increased by 10% of the…

A: Transformer A transformer is a device used in the power transmission of electric energy. The…

Q: 3. If the ratio of V/F has been kept constant and the observed value of hysteresis loss at ra…

Q: Calculate the coil Inductance when a Current of 10 A in a coil of 1500 turns produces a flux of 15…

Question

2- When the frequency of the voltage across of a (50HZ) power transformer increased by 10% of
the rated value, the no-load current:
a) Increased.
b) Decreased.
c) Remains the same.
3- The self-inductance of an iron-cored coil is a function of:
a) The geometry of the coil only.
b) The current passing through it only.
c) The frequency of the applied voltage only.
d) All of the above factors.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Sinusoids and Phasors of Alternating Circuit

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Electrical engineering A 375 kVA, 6600/400 V, 3-phase core type transformer has a total loss of 3700 watts on full load. The transformer tank is 1.25 m in height and 1 m × 0.5 m in plan. Design a suitable scheme for cooling tubes if the average temperature rise is to be limited to 35 °C. The diameter of the tube is 50 mm and are spaced 75 mm from each other. The average height of the tube is 1.05 m.
5) A short circuit test on 15kVa, 2400/240V, 60Hz transformer yields the following results: 6.25A, 132V and 215W. (A) determine the equivalent resistance referred to the high side in ohms, (b) determine the equivalent reactance referred to the high side in ohms,(c) determine the equivalent impedance referred to the high side in ohms, (d) determine the percent impedance of the transformer. Subject Electrical Apparatus and Devices
1) A 600 V source feeds a 480 V load with a transformer Conventional 5000 VA, 480/120 V. Consider the ideal transformer. a) Calculate the apparent nominal power of the transformer in the connection as Autotransformer. b) Calculate the currents on the high voltage side and on the low voltage side in these conditions. c) Calculate the current in the common coil in the connection as Autotransformer.
single coil 600 turns instrument transformer, operating in the step-down mode with a 40 percent tap, supplies a 5 kVA, 0.88 power factor inductive load. The input to the transformer is 3.3 kV, 50 Hz. Assume that leakage effects and minor losses in transformer are negligible. Determine the following : (0) Turn ratio; (ii) Load current(in Amp); (iii) Incoming line current(in Amp); (iv) Transformed current (in Amp); (v) Apparent power conducted(in kVA)and (vi) Apparent power transformed"
Two coupled coils have inductance of L1 = 0.8 H and L2 = 0.2 H, respectively. If the coefficient of coupling is 0.75, find the turns ratio N1/N2 for the coils. Show Solution Please
"A single coil 800 turns instrument transformer, operating in the step-downs mode with a 25 percent tap, supplies a 10 kVA, 0.80 power factor lagging load. The input to the transformer is 6600 V, 50 Hz. Assume that leakage effects and minor losses in transformer are negligible. Determine the following : (i) Turn ratio; (ii) Load current(in Amp); (iii) Incoming line current(in Amp); (iv) Transformed current (in Amp); (v) Apparent power conducted(in kVA)and (vi) Apparent power transformed"
A 2.4-kVA, 2400/240-V, 50-Hz, step-down transformer has the followingparameters: R, = 1.5 a, X, = 2.5 R, R, = 0.02 a, X, = 0.03 Q, R,, = 6 kR,and X,, = 8 kR. It is operating at 80% of its load at unity power factor.Using the exact equivalent circuit embodying the ideal transformer, determine the efficiency of the transformer. Also sketch its phasor diagram.
A transformer has 440 primary windings and 22 secondary windings. The potential difference across the primary coil is 100 V. The secondary coil is connected across a 125-ohm resistor. Find (a) secondary current (b) primary current. Hint: Use conservation of power. (c) effective load resistance of the SECONDARY COIL, which is connected across a 125 ohm resistor.
When an impedance coil is connected to a 114 volt 60 cps source, the current is 3 A. If the current rises to 4 A when a 116 volt 25 cps is is impressed across the coil, determine the values of the resistance and inductance of the coil.
A transformer connected to a 120V .C A source (effective value) must provide 13,000 V (effective value) for a noon ad. To prevent the risk of shock, a fuse is inserted into the primary circuit; the fuse must fuse if the effective current exceed the value of 8.50 mA in secondary. (a) What is the ratio between the number of spirals and the number of secondary turns of this transformer? (b) What is the power supplied to the transformer when the effective current in the secondary is 8.50 mA? (c) What should be the maximum current of the fuse inserted in the primary circuit?
A 20-ohm resistance is connected across the secondary winding of a single-phase power transformer whose secondary voltage is 150V. Calculate the primary voltage and the turns ratio if the supply current is 5A, neglecting losses.
Each motor is rated at 80 hp but is only loaded mechanically as follows: Motor # % Loading 1 40 2 50 3 70 The relationship between % of full load for each motor and efficiency (they are all the same) is given by the graph below: a) What is the minimum required transformer rating in kVA? b) By what percentage could the required transformer rating be reduced if a capacitor bank were installed in parallel with the motors, improving the power factor of the loadcentre to unity?