Recent questions tagged copper

Description : How to Solder Copper Pipe

Last Answer : How to Solder Copper Pipe Copper tubing or pipes work well for air, water or even refrigerants. If you want to join them together with sweat joints , you'll have to learn how to solder them ... effect on their efficiency. Follow these steps and be able to do copper pipe soldering all by yourself.

Description : How to Patina Copper

Last Answer : How to Patina Copper Patina is that tarnish coating that develops outside metal, like copper, over time. Not only does it add an attractive appearance to copper, but it also provides protection to harsh ... egg. Once you've reached the desired patina coat, rinse the copper pieces in lukewarm water.

Description : How to Clean Copper

Last Answer : How to Clean Copper Whether it's a coin, a pan, or a trophy, copper has one of the nicest-looking finishes among common metals. Copper can retain its finish for quite a while, although it is ... properly. With these tips, you'll never have to worry about your copper items losing their shine again.

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

Description : Why is aluminium used instead of copper for overhead cables?

Last Answer : Because copper reacts with atmosphere variation and it's cost High as compared to aluminium and aluminium is good property and less cost so aluminium is used

Description : Which is a semiconductor: copper, silicon, or neon?

Last Answer : Copper is a metal. Silicon is a semiconductor. Neon is inert gas.

Description : Compare copper and aluminium.

Last Answer : Copper Aluminium Resistivity is less Resistivity is more More weight Low weight Mechanically strong Mechanically weaker Specific Gravity high Specific Gravity Low ... Tensile strength is half of that of copper Used for winding Used for overhead lines

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

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

Description : Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be?

Last Answer : Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be 10 ohms.

Last Answer : Copper brushes in D.C. machine are used where low voltage and high currents are involved.

Last Answer : The ground wire should not be smaller than No 10 copper.

Description : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Last Answer : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.

Description : How do magnets and copper wire make electricity?

Last Answer : According  to  Faradays  law , a changing  magnetic  field  on  a  conductor  induses  current  in  the  conductor  through   mutual  induction.

Description : explain skin effect in copper interconnects. what are the various ways of reducing this effect?

Last Answer : Skin effect generally observed in ac conductor in transmission network, in skin the current flowing through outer layer of conductor is more than iner area of conductor thus we can say the ... for reducing this effect we can use boundel conductor or used hollow conductor for power transmission