Transformers (10 Points)

Given:

• 150kVA 2400V/240V 60 Hz transformer.
• Open circuit test on the 240V winding of the transformer gives:
• Short circuit test was done with the low voltage winding short circuited.

Find:

• Exciting admittance, conductance, and susceptance.
• Equivalent primary impedance, reactance, and resistance.
• For efficiency of the transformer at the rated load at 0.8 lagging power factor.

 

 

Induction Machines (10 Points)

Given:

• 480V, 60Hz 3 phase induction motor.
• At full load,

Find:

1. Slip
2. Full load torque
3. Rotor current
4. Copper loss
5. Input power
6. Reactive power at input
7. Motor power factor.

 

 

Synchronous Machines (10 Points)

Given:

• 100MVA synchronous generator is connected to a 25 kV infinite bus through two parallel transmission lines.
• is delivered to the infinite bus at 0.8 lagging power factor.

Find:

• Whether the generator can still deliver the load if one of the transmission lines is knocked out and the mechanical power and excitation to the generator does not change.

 

Power Electronics (10 Points)

Given:

• Half wave rectifier
• Converting 120VRMS voltage into DC.
• Load is 5Ω

Find:

1. Average voltage across the load.
2. Average voltage of the source.
3. RMS voltage of the load
4. RMS current of the load.
5. Power consumed by the load.

 

 

Easy Extra 5 points: (5 Points)

I wanted to see whether this class made any difference on your conception of the electric energy systems. This question should be easy, but single word answers will not get you those points nor will full blown essays. You need to be able to concisely convince me that you fully understand opinions based on what we had discussed in class.

1. Which idea or concept that we discussed made the most impression on you? Why?
2. Are you more optimistic or pessimistic about our energy future after having taken this class? Why?
3. After having taken this class, are you more or less curious about our electrical energy future as a consumer? Why?
4. Would you consider going into electric power as a career option after having taken this class? Why?
5. Did this class change your outlook on the complexity of the electric energy system? Name one thing that was a key to changing your outlook. Why?

 

 

 

 

APA

 

 

 

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The post Given: 150kVA 2400V/240V 60 Hz transformer. Open circuit test on the 240V winding of the transformer gives: Short circuit test was done with the low voltage winding short circuited. Find: Exciting admittance, conductance, and susceptance. Equivalent primary impedance, reactance, and resistance. For efficiency of the transformer at the rated load at 0.8 lagging power factor. appeared first on Apax Researchers.