Transformers are rated in:
a. Polarity
b. Service factor
c. Watts
d. Core temperature
e. kVA
Answer: E
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Power Engineering Chapter 82
- Which transformer is used to trap the harmonics on the primary windings?
- Double-wound transformers can be connected as?
- Iron loses in a transformer are caused by?
- All of the primary and secondary is wound on the centre leg. This transformer is called?
- Primary and secondary windings are split into two equal parts, with one half of the primary and one half of the secondary wound on each of the two "legs" of the transformer. This transformer is called?
- If the secondary voltage is smaller than primary voltage in a transformer. This transformer is called?
- If the number of secondary turns is greater than the number of primary turns in a transformer. This transformer is called?
- In a dc circuit, self-inductance is __ when voltage is at maximum, while in a ac circuit self inductance is __
- When relative movement ceases, production of induced E ceases. This process is called
- The size of the conductor is __ to the size of the current.
- Transformer cooling oil has
- Current transformers step down the current rather than the
- The capacity of a transformer can be increased by: 1. submerging the core and windings in a tank of oil 2. submerging the core and windings in a tank of water 3. forced air cooling the oil in a heat exchanger 4. wrapping the core with a thermal insulation 5. forced air cooling of the core
- Transformers are rated in terms of: 1. Volt amperes 2. Kilowatts 3. Kilovolt amperes 4. Ohms
- A device used to change the voltage and current from one level to another, is known as a/an
- Copper losses in a transformer are reduced by
- A transformer works on the principle of
- Transformers require:
- The voltage induced in the secondary windings of the transformer, is _____ the turns ratio of the transformer.
- A phenomenon produced by electric switchgear that can result in excessively high voltages in transformers is known as:
- Auto-transformers:
- When AC action causes a counter current in a coil of wire, it is termed:
- Single-phase transformers:
- An instrument transformer used to measure voltage is called a:
- An operating current transformer should never: