Exam (elaborations)
2nd Engineer Written Exam Questions Answers Solved 100% Correct
- Course
- Institution
2nd Engineer Written Exam Questions Answers Solved 100% Correct
[Show more]
Content preview
2nd Engineer Written Exam Questions Answers Solved 100% CorrectYou are on shift at your plant with the turbine generator offline and on turning gear. When would you close the generator breaker and why? - ANS-Only when the turbine generator is up to speed or if there is a second breaker in series with the main generator breaker that is tagged and locked out to prevent power from flowing back into the generator.
How are radial clearances measured on a turbine? - ANS-Use a bridge gauge or a depth gauge micrometer.
What do the following letters stamped in the official symbol of ASME stand for:
R, M, E, A - ANS-R- Repair M - Miniature E - Electric A - Assembly
What are the 3 Methods commonly used to purify feedwater? - ANS-Water Softeners, Demineralizers, Reverse Osmosis.
Also Water Chemistry and Feedwater Heating.
If you are granted this license, what can you do with it in reference to Chapter 146 of the
General Law? - ANS-Second Class, To have charge of and operate a boiler or boilers, and to have charge of and operate engines, none of which shall exceed one hundred and fifty horsepower, or to operate a first class plant under the engineer in direct charge
thereof.
What is the meaning of a pH value of water and in what range should it be carried at in boilers using moderate pressures? - ANS-pH is a measure of the water's Acidity or Alkalinity. On a scale of 0-14, where 7 is neutral. In Boilers, you should maintain a pH of
around 9.5-11, normally around 10.
List the necessary safety appliances required in the operation of Power Boilers? - ANS-
Safety Valve, Pressure Gauge, Water Level Gauge, Safety Relief Valve, Rupture Disk, Low Water Fuel Cutoff, Check Valve.
Which type of turbine has the greatest end thrust, impulse or reaction? Why? - ANS-
Reaction, due to the blade design and the pressure drop along stages
Name at least 6 Steam Turbine Losses. - ANS-1. Throttling Loss
2. Mechanical Loss
3. Leaving Loss
4. Radiation Loss
5. Exhaust Loss
6. Nozzle and Blade Loss
7. Gland Leakage 8. Interstage Leakage
Explain the difference between the following ASME valves and their application:
Safety Valve and Safety Relief Valve - ANS-Safety Valve: An Automatic pressure relieving device actuated by the static pressure upstream of the valve and characterized
by the full opening pop action. It is used in gas or vapor service.
Relief Valve: An automatic pressure relieving device actuated by the static pressure upstream of the valve which opens further with increase in pressure over the opening pressure. It is primarily used for liquid service.
Safety Relief Valve: An automatic pressure actuated relieving device suitable for use either as a safety valve or relief valve, depending on the application.
A. What is the license law horsepower of a water tube boiler having 6,000 square feet of
water heating surface and 1,000 sq feet of water wall heating surface and fire by oil.
B. In the above named boiler, what is the minimum discharge relieving capacity of safety valves and how many valves are required? - ANS-HP = (W.H.S X F) / 34.5 + (W.W.H.S X F) / 34.5
HP = (6000 X 10)/34.5 + (1000 X 16)/34.5
HP = 2204
B) Min Discharge = 6000 X 10 + 1000 X 16
Min D = 60000 + 16000
Min D = 76000 lb steam per hour
Must have 2 or more valves
List 4 reasons for losing vacuum in a plant using a surface condenser. How could each condition be corrected? - ANS-The following are reasons vacuum could be lost in a plant using a surface condenser and remedies to correct the conditions.
1. Insufficient cooling water - Increase water flow and check intake water line. Check makeup water supply to cooling tower.
2. Fouled Air Ejectors - Change over air ejectors and clean faulty ejector.
3.Dirty Condenser - Remove from service as soon as possible for cleaning.
4. Loss of water seal in hotwell - Re-establish water seal
5. Water logged Condenser - Check condenser condensate pump and return to service.
A turbine has a 6" Turbine inlet pipe. The owners would like to place a 4" diameter spool
piece at the inlet of the turbine. According to 146, what license must a person possess to be the engineer in charge of this turbine? - ANS-1st Engineers license. The entire turbine inlet pipe per turbine manufacturers design specs must be less than 5" to be a second engineers license. A spool piece would not justify this change.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller CLOUND. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75619 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now