Question No. 1
Which heating value is indicated by a calorimeter and why?
Answer:
Gross heating value because steam is condensed and heat of vapour formed is recovered.
Question No. 2
When does Emergency Seal Oil Pump automatically start?
Answer:
When its pressure switch senses Main Seal Oil Pump discharge pressure reduced to 78 PSI.
Question No. 3
What is the consequence of not maintaining hydrogen (or air) pressure in generator casing at a value above atmospheric pressure when seal oil system is in service?
Answer:
Failure to do so will cause excessive seal oil to be drawn into the generator.
Question No. 4
What is a radial-flow turbine?
Answer:
In a radial-flow turbine, steam flows outward from the shaft to the casing. The unit is usually a reaction unit, having both fixed and moving blades.
Question No. 5
What are four types of turbine seals?
Answer:
1. Carbon rings fitted in segments around the shaft and held together by garter or retainer springs.
2. Labyrinth mated with shaft serration’s or shaft seal strips.
3. Water seals where a shaft runner acts as a pump to create a ring of water around the shaft. Use only treated water to avoid shaft pitting.
4. Stuffing box using woven or soft packing rings that are compressed with a gland to prevent leakage along the shaft.
Question No. 6
What are two types of clearance in a turbine?
Answer:
Radial – clearance at the tips of the rotor and casing.
Axial – the fore-and-aft clearance, at the sides of the rotor and the casing.
Question No. 7
Which reactor uses natural uranium as fuel?
Answer:
Gas cooled reactors.
Question No. 8
Which reactor uses heavy water as moderator?
Answer: CANDU.
Question No. 9
Which reactor requires no moderator?
Answer: Breeder reactor.
Question No. 10
Which reactor uses primary coolant as fluoride salts of lithium, beryllium, thorium and uranium?
Answer: Molten salt breeder reactor.
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