Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties.
Last Answer : Following are requirements of conductor:- i) High conductivity : Material should have high conductivity, So that * cross section of conductor (size) reduces, * Copper losses reduces, * So Efficiency ... . Boiling point is 1820°C 9. Specific gravity is 2.7 10. High resistance to corrosion.
Show More
214 views
1 answer
asked
May 7, 2020
by
anonymous
How does the resistance of a conductor compare to that of an insulator?
Last Answer : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.
Show More
2.7k views
1 answer
asked
Jun 29, 2019
by
anonymous
When electric current passes through a metallic conductor, its temperature rises. This is due to?
Last Answer : When electric current passes through a metallic conductor, its temperature rises. This is due to collisions between conduction electrons and atoms.
Show More
236 views
1 answer
asked
Mar 25, 2018
by
anonymous
.jpg)
Heat in a conductor is produced on the passage of electric current due to?
Last Answer : Heat in a conductor is produced due to frictional collision of electrons flow as they conduct current.
Show More
227 views
1 answer
asked
Mar 25, 2018
by
anonymous
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.
Show More
382 views
1 answer
asked
Mar 25, 2018
by
anonymous
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.
Show More
165 views
1 answer
asked
Mar 19, 2018
by
anonymous
The insulation on a current carrying conductor is provided?
Last Answer : The insulation on a current carrying conductor is provided to prevent leakage of current, to prevent shock.
Show More
210 views
1 answer
asked
Mar 25, 2018
by
anonymous
Current velocity through a copper conductor is
Show More
121 views
0 answers
asked
Mar 25, 2018
by
anonymous
Source transformation voltage source to current source and vice versa
Show More
98 views
0 answers
asked
Mar 21, 2020
by
anonymous
Explain why potential difference is necessary to produce current in a circuit.
Show More
99 views
0 answers
asked
Jun 29, 2019
by
anonymous
How to find total impedance Z, current I and Impedance angle ?
Last Answer : How to find total impedance Z, current I and Impedance angle ?
Show More
165 views
2 answers
asked
May 30, 2019
by
anonymous
Is Aluminium a good conductor of electricity?
Last Answer : Yes aluminium is a conductor and it is a good conductor of electricity. But copper have better conductivity as compare to aluminium.
Show More
127 views
1 answer
asked
Mar 10, 2018
by
anonymous
Why ACSR conductor is used for overhead lines?
Last Answer : It has high tensile strength
Show More
2.7k views
1 answer
asked
Mar 10, 2018
by
anonymous
Define surface tension. State its S.I. unit.
Last Answer : Definition:- The force acting per unit length of an imaginary line drawn to surface of liquid. OR The surface tension is defined as the property of liquids by virtue of which the surface of a liquid is ... due to the tendency to contract and occupy minimum surface area. S.I. unit :- N/m
Show More
70 views
1 answer
asked
May 25, 2020
by
anonymous
State the significance of following terms : i) Hydrology ii) Surface run-off iii) Evaporation iv) Precipitation
Last Answer : (i) Hydrology: It may be defined as the science which deals with the depletion and replenishment of water resources. Hydrology deals with the occurrence and distribution of water over and under earth's ... types: a) Liquid precipitation (Rainfall) b) Solid precipitation (Snow, Hail)
Show More
74 views
2 answers
asked
Sep 7, 2018
by
anonymous
In an AC. circuit, a low value of kVAR compared with kW indicates?
Last Answer : In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.
Show More
713 views
1 answer
asked
Mar 25, 2018
by
anonymous
Last Answer : In main line service as compared to urban and suburban service distance between the stops is more, maximum speed reached is high, acceleration and retardation rates are low.
Show More
64 views
1 answer
asked
Mar 22, 2018
by
anonymous
Last Answer : A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.
Show More
136 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : An alternator coupled to a hydraulic turbine runs at slow speed, as compared to others.
Show More
105 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : H.R.C. fuse, as compared to a rewirable fuse, has no ageing effect, high speed of operation, high rupturing capacity.
Show More
118 views
1 answer
asked
Mar 20, 2018
by
anonymous
In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
Last Answer : In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.
Show More
524 views
1 answer
asked
Mar 18, 2018
by
anonymous
About trnsformer
Last Answer : Acc to Ohms law V=IR but it is only applicable when our resistance R is constant, as in case of transformer we take impedence which is equivalent to resistance is not constant it varies with system parameters that why Ohms law not applicable in case of transformer
Show More
120 views
1 answer
How to Memorize More
Last Answer : How to Memorize More Memorizing important information for the big test is no laughing matter. Your memorization skills may mean the difference between passing and failing. These tips and tricks can ... course, paying attention in class will ensure you more long-term memory storage than cramming.
Show More
3 views
1 answer
Which is more temperature stable, a carbon-composition or a metal-film resistor?
Show More
93 views
0 answers
asked
Jul 2, 2019
by
anonymous
Which have more free electrons: conductors or insulators?
Last Answer : Conductors have many free electrons whereas insulators have very few or none at all.
Show More
147 views
1 answer
asked
Jul 1, 2019
by
anonymous
Ferranti Effect is more pronounced when ___________ A) the line is longer and the voltage applied is higher B) the line is shorter and the voltage applied is lower C) the line is shorter and the voltage applied is higher D) none of these
Last Answer : Ferranti Effect is more pronounced when the line is longer and the voltage applied is higher
Show More
209 views
1 answer
asked
Apr 29, 2018
by
anonymous
State the material used for making (1) Magnetic Core (2) Fuse element
Last Answer : The material used for making of: (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel (2) Fuse Element: Tin- lead wire, Tinned copper wire
Show More
209 views
1 answer
asked
May 7, 2020
by
anonymous
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.
Show More
132 views
1 answer
asked
Jul 27, 2019
by
anonymous
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
Show More
774 views
1 answer
asked
May 8, 2018
by
anonymous
The core construction is like spokes of a wheel in following transformer: (A) Berry Type Transformer (B) Core Type Transformer (C) Shell Type Transformer (D) None of the above
Last Answer : The core construction is like spokes of a wheel in following transformer: Berry Type Transformer
Show More
133 views
1 answer
asked
May 8, 2018
by
anonymous
Core type transformers are popular in___________. (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above
Last Answer : Core type transformers are popular in High voltage applications
Show More
96 views
1 answer
asked
May 8, 2018
by
anonymous
The desirable properties of transformer core material are (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.
Last Answer : The desirable properties of transformer core material are high permeability and low hysteresis loss.
Show More
230 views
1 answer
asked
May 1, 2018
by
anonymous
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is (A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm
Last Answer : A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is 2 cm
Show More
171 views
1 answer
asked
Apr 28, 2018
by
anonymous
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm
Last Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm
Show More
756 views
1 answer
asked
Apr 28, 2018
by
anonymous
The main purpose of using core in a transformer is to (A) decrease iron losses (B) eliminate magnetic hysteresis (C) reduce reluctance of the common magnetic circuit (D) prevent eddy current loss
Last Answer : Reduce Relucatnce of the common magnetic circuit.
Show More
2.0k views
2 answers
asked
Apr 28, 2018
by
anonymous
Last Answer : The armature core of a D.C. generator is usually made of silicon steel.
Show More
153 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Material used for construction of transformer core is usually silicon steel.
Show More
241 views
1 answer
asked
Mar 19, 2018
by
anonymous
The size of a transformer core will depend on?
Last Answer : The size of a transformer core will depend on frequency and area of the core.
Show More
114 views
1 answer
asked
Mar 19, 2018
by
anonymous
Reduction in core losses and increase in permeability are obtained with transformer employing?
Last Answer : Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.
Show More
615 views
1 answer
asked
Mar 19, 2018
by
anonymous
Why does the core of a transformer need to be laminated?
Last Answer : Transformer cores are laminated to reduce eddy current loss.
Show More
122 views
1 answer
asked
Mar 14, 2018
by
anonymous
In DC generators lamination core are generally made of?
Last Answer : In DC generators lamination core are generally made of silicon steel.
Show More
256 views
1 answer
asked
Mar 3, 2018
by
anonymous
.jpg)
Last Answer : Transformer core is laminated to reduce Eddy current losses.
Show More
112 views
1 answer
asked
Sep 30, 2017
by
anonymous
State properties of conductor material used for overhead conductor.
Last Answer : Following are the properties of conductor material:- 1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value.
Show More
131 views
1 answer
asked
May 5, 2020
by
anonymous
Last Answer : Which allows the flow electrons
Show More
170 views
3 answers
reasons the transposition of conductor
Last Answer : Following reasons the transposition of conductor: 1. Due transposition of conductor inductance of each line is same LA = LB = LC, So drop due to inductive reactance in each line is same so ... interferences are less due to transposition. Figure of transposition of conductor:
Show More
79 views
1 answer
asked
Aug 25, 2019
by
anonymous
What is difference between Conductor and insulator ?
Last Answer : Conductor is a material that offers no resistance to the flow of current, while an insulator is a material that offers total resistance to the flows of current, It doesn't allowed any flows of current.
Show More
63 views
1 answer
asked
Aug 15, 2019
by
anonymous
What is the difference between a cable and a conductor?
Show More
109 views
0 answers
asked
Aug 12, 2019
by
anonymous
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.
Show More
162 views
1 answer
asked
Jul 1, 2019
by
anonymous
In a metal conductor, what is a free electron?
Last Answer : When many atoms are close together in a copper wire, the outermost orbital electron of each copper atom can easily break free from its home or parent atom. These electrons then can migrate easily ... random. Such electrons that can move freely from one atom to the next are called free electrons.
Show More
193 views
1 answer
asked
Jun 29, 2019
by
anonymous
A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand?
Last Answer : A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand? 1 cm
Show More
1.3k views
1 answer
asked
May 8, 2018
by
anonymous
