NJ Blue Seal EXAM
1. Why must alternators run at a constant speed?
Answer In order to maintain frequency
2. What does h represent?
Answer The sum of latent heat and sensible heat
3. If your cold water pump discharge pressure gauge indicated 346 psi, what
would be the head in feet?
Answer 346 x 2.31= 800psi
4. Formula for finding Horsepower in a Kilowatt
Answer 1.341 x kW = HP
5. If you have a 500 k/W generator, what is the HP?
Answer 1.341 x 500 = 670.5
6. What is the formula for finding the Factor of Evaporation ?
Answer FE Hs -(Tfw - 32)/970.3
7. What chemicals cause hard scale in a boiler?
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, Answer Calcium carbonate and magnesium carbonate
8. What is the critical speed of a turbine?
Answer The speed at which it vibrates the most
9. An intercooler is found
Answer In a two stage air compressor
10. What protects a turbine shaft from bowing?
Answer A turning gear
11. When do you lubricate a turbine with oil?
Answer Before starting it up
12. What is the formula used to calculate Btu's in a pound of fuel?
Answer Btu's/lb. fuel= 17,687(57.7 x API) Plus (+) then Times (x)
13. What suction performance factor is a characteristic of the pump and varies
with pump design, pump size and operating conditions?
Answer NPSH
14. Licenses can be renewed days before expiration.
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1. Why must alternators run at a constant speed?
Answer In order to maintain frequency
2. What does h represent?
Answer The sum of latent heat and sensible heat
3. If your cold water pump discharge pressure gauge indicated 346 psi, what
would be the head in feet?
Answer 346 x 2.31= 800psi
4. Formula for finding Horsepower in a Kilowatt
Answer 1.341 x kW = HP
5. If you have a 500 k/W generator, what is the HP?
Answer 1.341 x 500 = 670.5
6. What is the formula for finding the Factor of Evaporation ?
Answer FE Hs -(Tfw - 32)/970.3
7. What chemicals cause hard scale in a boiler?
1/
14
, Answer Calcium carbonate and magnesium carbonate
8. What is the critical speed of a turbine?
Answer The speed at which it vibrates the most
9. An intercooler is found
Answer In a two stage air compressor
10. What protects a turbine shaft from bowing?
Answer A turning gear
11. When do you lubricate a turbine with oil?
Answer Before starting it up
12. What is the formula used to calculate Btu's in a pound of fuel?
Answer Btu's/lb. fuel= 17,687(57.7 x API) Plus (+) then Times (x)
13. What suction performance factor is a characteristic of the pump and varies
with pump design, pump size and operating conditions?
Answer NPSH
14. Licenses can be renewed days before expiration.
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