Why is it called variable resistor?
The power input to a 500V 50Hz 6Pole 3 phase induction motor running at 975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses are 2kW. Calculate: (i) Slip (ii) Rotor copper loss (iii) Shaft power (iv) Efficiency
Which loss is called as copper loss?
Is copper loss in transformers?
Does copper loss depend on voltage?
Which loss is called a copper loss?
Which factor the copper loss of a transformer depends?
What does copper loss depend on?
What is copper loss?
Why is it called hysteresis loss?
Why is Rotameter called a variable area flowmeter? Explain the working of Rotameter with a neat diagram. State one advantage and one disadvantage.
Why copper is used in RTD?
Why is copper called rabbit?
Why is a potential divider better than a variable resistor?
Why Ohms law is not applicable at variable temperature?
How will the resistivity of a wire change if it is stretched to double its original length without loss of mass?
What is a bimetallic strip of copper and aluminum?
State the properties of copper and aluminium which make them good conductors of electricity.
Compare copper and aluminium on the basis of: (i) Tensile strength (ii) Conductivity (iii) Specific gravity (iv) Application.
Explain the suitability of copper as an electrical conductor with reference to its mechanical and electrical properties.
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.
A 500kVA distribution transformer having copper and iron losses of 5kW and 3kW respectively on full load. The transformer is loaded as shown below: Loading (kW) Power Factor (Lag) No. of hours 400 0.8 06 300 0.75 12 100 0.8 03 No load - 03 Calculate the all-day efficiency.
What is the difference between a resistor and a variable resistor?
What is the difference between a variable resistor and a potential divider?
What is hysteresis and why is it used?
What is MMF and why is it used?
Why is it called XC and not CC?
What is node and why it is used?
Why is it easy to convert from binary to hexadecimal and vice versa?
What is PLC and why is it used?
What is a snubber circuit, and why is it used in power electronics?
What is a power factor, and why is it important?
Why is it 110 and 220 volts?
How to minimize copper losses?
Which winding is better, copper or aluminium?
Which expands more, copper or aluminium?
What is the nickname of copper metal? Answer : Copper is often nicknamed "red metal" because of its reddish-brown color. Another common nickname is "electrical metal" due to its excellent conductivity, which makes it widely used in electrical wiring....
Is copper or silver the anode?
What is the full name of copper?
What is ECE of copper?
State Magneto-striction. Draw Hysteresis loop for: (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood.
What is the permittivity of copper?
Why does hysteresis loss occur?
Why is hysteresis loss?
Why silicon steel is used to reduce hysteresis loss?
What is a variable resistor?
What is a VFD (Variable Frequency Drive)?
How does a variable reluctance stepper motor work?
How does a varactor diode function as a variable capacitor?
What is the purpose of a voltage-controlled resistor in variable gain circuits?
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