106 views

1 Answer

Answer :

Iron loss of a transformer can be measured by low power factor wattmeter.

Like 0 like

Please log in or register to answer this question.

Related questions

116 views

Description : In an actual transformer the iron loss remains practically constant from no load to full load because?

Last Answer : In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

1 answer
173 views

Last Answer : If the supply frequency to the transformer is increased, the iron loss will increase.

1 answer
314 views

Description : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

Last Answer : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W

1 answer
141 views

Description : Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Last Answer : Dielectric loss in a capacitor is best measured by Schering Bridge

1 answer
170 views

Description : When secondary of a current transformer is open-circuited its iron core will be?

Last Answer : When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

1 answer
388 views

Description : A ferrite core has less eddy current loss than an iron core because?

Last Answer : A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

1 answer
794 views

Description : A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Last Answer : A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

1 answer
19 views

Description : How is energy measured ?

Last Answer : How is energy measured What is energy? Energy is the ability to do work and results in a change. It is a very commonly used word in our everyday lives. Different Forms of Energy Energy exists as ... for one hour. Horsepower is another unit of measuring energy. 1 HP is equivalent to 745.7 watts.

1 answer
4.2k views

Description : The load of a consumer is generally measured in terms of : (A) Volts (B) Amperes (C) Ampere hour (D) kW

Last Answer : The load of a consumer is generally measured in terms of : kW

1 answer
106 views

Description : True value has been 50 whereas measured value is 40 then the percentage error in the reading will be ______.  (A) 20% (B) 40% (C) 50% (D) 30%

Last Answer : True value has been 50 whereas measured value is 40 then the percentage error in the reading will be 20%. 

1 answer
137 views

Description : In a battery, the difference between the no-load voltage and the measured voltage output is called ________ A) Internal voltage B) Internal resistance C) External resistance D) All the above

Last Answer : In a battery, the difference between the no-load voltage and the measured voltage output is called Internal resistance

1 answer
175 views

Description : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Last Answer : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

1 answer
187 views

Description : The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge

Last Answer : The self inductance of a coil can be measured using Anderson’s Bridge

1 answer
115 views

Description : Liquid flow rate is measured using (A) a pirani gauge (B) a pyrometer (C) an orifice plate (D) a bourdon tube

Last Answer : Liquid flow rate is measured using an orifice plate

1 answer
210 views

Last Answer : E.m.f. of a Weston cell is accurately measured by electrostatic voltmeter.

1 answer
112 views

Last Answer : A direct current can be measured by a D.C. potentiometer in conjunction with a standard resistance.

1 answer
94 views

Last Answer : Resistances can be measured with the help of ohmmeters and resistance bridges.

1 answer
204 views

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Last Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

1 answer
154 views

Last Answer : The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.

1 answer
220 views

Last Answer : The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

1 answer
558 views

Last Answer : The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.

1 answer
1 view

Description : Do you iron your clothes?

Last Answer : Lika hail no!

1 answer
0 views

Description : Which Foods are Good Sources of Iron?

Last Answer : Google, Google and Google some more. I did this for iron rich foods just 2 days ago and there is a plethora of great information. Also, do what your Dr. told you, but I do find that slow release iron supplements (like slow-fe) are far easier on your system.

1 answer
11 views

Description : How to Clean Wrought Iron

Last Answer : How to Clean Wrought Iron Items made from wrought iron can look beautiful, grand and elegant, but it only takes a few years for them to make your house looking like a haunted house more than an elegant ... of time. Chances are, you will just have to paint over the stains to cover them up completely.

1 answer
0 views

Description : How to Iron Jeans ?

Last Answer : How to Iron Jeans There's nothing like a pair of thoroughly wrinkled jeans to make one look unkempt and unhygienic. Learn how to iron your jeans properly, which will only make you look good, but it will ... can last for a week. You can also opt to iron your jeans once a week, after laundering.

1 answer
6 views

Description : How to Increase Iron in Your Diet ?

Last Answer : How to Increase Iron in Your Diet Iron is essential for the production of hemoglobin and myoglobin. These are important proteins needed in transporting oxygen throughout the body. Iron also improves ... iron sources in your diet to prevent acquiring diseases associated with low levels of iron.

1 answer
1 view

Description : How to Iron a Shirt ?

Last Answer : How to Iron a Shirt If you want to learn how to iron your own clothes, shirts are a good starting point. Shirts are typically the easiest to iron, and can be done perfectly in a short time. Here' ... fabric and beads should have a towel on top for an indirect contact, with the iron on a low setting.

1 answer
11 views

Description : How to Clean a Steam Iron ?

Last Answer : How to Clean a Steam Iron Ironing clothes with a steam iron is a relatively easy task, but if the appliance is not properly maintained, it will cause more harm than good. Steam irons become clogged ... ironing will not be a tedious task. Remember these steps and keep your steam iron in tiptop shape.

1 answer
3 views

Description : What to look for when choosing an iron?

Last Answer : What to look for when choosing an iron? Today, the purchase of an iron is not a big problem. This piece of household appliances is presented in a wide range of stores. Each manufacturer tries to ... its presence increases the cost of the iron by an average of 10%. Good luck with your choice!

1 answer
166 views

Description : Which is the best conductor: silver, carbon, or iron?

Last Answer : Silver is the best conductor. Carbon is the semiconductor. Iron have less conductance as compared to silver.

1 answer
352 views

Description : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Last Answer : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

1 answer
88 views

Description : The iron alloy, ALNICO is mainly used to make ________ A) Temporary magnets B) Permanent magnets C) Transmission lines D) None of these

Last Answer : The iron alloy, ALNICO is mainly used to make Permanent magnets

1 answer
2.3k views

Description : Eddy current damping cannot be used for moving iron instrument because

Last Answer : Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

1 answer
140 views

Description : In DC motor iron losses are occurred in?

Last Answer : In DC motor iron losses are occurred in the armature.

1 answer
106 views

Description : In AC. circuits, laminated iron is invariably used in order to?

Last Answer : In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.

1 answer
200 views

Last Answer : A moving iron instrument can be used for both D.C. and A.C.

1 answer
164 views

Last Answer : Iron losses in a D.C. machine are independent of variations in load.

1 answer
274 views

Last Answer : In a D.C. generator, the iron losses mainly take place in armature rotor.

1 answer
173 views

Description : Explain the effect of Harmonics on the Transformer.

Last Answer : Effect of Harmonics on the Transformer:  1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations.  5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.

1 answer
494 views

Description : List two special feature of welding transformer.

Last Answer : Special features of welding transformer: i) It is a step down transformer that reduces the source voltage to a voltage desired according to the demands of the welding process. ii) Having large primary turns and less ... V ii) Secondary voltage - 40 to 60 V iii) Secondary current - 200 to 600 A

1 answer
64 views

Description : State two applications of isolation transformer

Last Answer : Applications of isolation transformer: i) Isolates the load equipment from supply ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device. iv) Protects loads from harmonic distortion.

1 answer
503 views

Description : State why a transformer always have an efficiency of more than 90%.

Last Answer : As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

1 answer
406 views

Description : Equivalent circuit of transformer

Last Answer : Equivalent Circuit Diagram of Transformer Referred to Primary: V1 -Primary Input voltage I1 - Input Current I0- Exciting current/ No load current Im- Magnetizing component ... equivalent of secondary terminal voltage ZL- Load impedance ZL ′- Primary equivalent of load impedance

2 answers
263 views

Description : Single phase transformer

Last Answer : Single phase Transformer Transformer

1 answer
162 views

Description : What is the use of transformer?

Last Answer : The use of transformer  is to do lower or raise  the voltage or currents in an electrical  circuit.  That's quite so simple. 

1 answer
250 views

Description : Write about transformer on DC.

Last Answer : Transformer on DC : Transformer cannot work on DC. Transformer works on electromagnetic induction principle. Electromagnetic induction principle means when flux linking with coil changes and EMF induced in it ... winding insulation will burn. https://youtu.be/TVp_0fIfxqY

1 answer
115 views

Description : Even at no-load, a transformer draws current from the mains. Why?

0 answers
196 views

Description : State and justify which of the following two transformers is better:  Transformer A = 4% voltage regulation  Transformer B = 6% voltage regulation

Last Answer : Transformer A with 4% voltage regulation is better.  Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

1 answer
148 views

Description : State any four characteristics of core type transformer.

Last Answer : Characteristics of core type transformer: i) It has one window. ii) It has one magnetic circuit. iii) Core surrounds the winding. iv) Average length of core is more. v) Area of cross ... Better cooling for winding. vii) Mechnical strength is comparatively less. viii) Repair and maintenance is easy.

1 answer
386 views

Description : Explain construction and working of single phase Auto transformer.

Last Answer : Construction of single phase auto transformer: (i) It has only one winding wound on a laminated circular magnetic core. (ii) The core is made of silicon steel stampings. (iii) The two terminals of the ... help of handle. 5) The same transformer can be used as step-up or step down auto-transformer

1 answer
...