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Power Engineering 3A2 - Review 2 All Questions Answered 100% Correctly 2024 Update
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Power Engineering 3A2 - Review 2 All Questions Answered 100% Correctly 2024 Update The "Pressure Vessels" section of the B-51 code identifies pressure vessels and their installation, including pressure vessel inspection openings. This section also shows the design of cushion tanks, blow-off vessel...

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  • August 29, 2024
  • 45
  • 2024/2025
  • Exam (elaborations)
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  • power engineering 3a2 review 2 all questions ans

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Power Engineering 3A2 - Review 2 All
Questions Answered 100% Correctly 2024
Update
The "Pressure Vessels" section of the B-51 code identifies pressure vessels and their
installation, including pressure vessel inspection openings. This section also shows the
design of cushion tanks, blow-off vessels, and the installation of:




A
Select one:
A. Air receivers.




VI
B. Boiler drums.
C. Dearators.
D. Blowdown tanks.




TU
E. Fuel tanks.
A
IS
An electric kettle is rated at 1500 W at 120 volts. The resistance would be:
Select one:
A. 9.6 ohms
OM

B. 12.5 ohms
C. 24 ohms
D. 96 ohms
E. 180 ohms
A
NA



The yoke in a DC machine is usually made of:
Select one:
JP




A. Steel.
B. Copper.
C. Aluminum.
D. Insulation.
E. Semi-conducting materials.
A


Time lag fuses have two parts, a _____ cutout part and a _____ link.

,Select one:
A. Timer, reset.
B. Metal. Powder.
C. Thermal, fuse.
D. Voltage, amp.
E. Timer, fuse.
C


480 V emergency switching could be described as:




A
Select one:
A. In the event that the incoming 4.16 kV power should be lost critical users are




VI
supplied with 4.16 kV emergency power from the 900 kW natural gas turbine generator.
B. In the event that the incoming utility power should be lost, critical users are supplied
with 480V emergency power from the 250 kW diesel generator.




TU
C. In the event that the incoming 600 V power should be lost critical users are supplied
with 4.16 kV emergency power from the 900 kW natural gas turbine generator.
D. In the event that the incoming 600 V power should be lost critical users are supplied
with 600 V emergency power from the 900 kW natural gas turbine generator.
IS
E. In the event that the incoming utility power should be lost, critical users are supplied
with 4.16 kV emergency power from the 250 kW diesel generator. The second
automatic transfer switch, will switch over to this generator in order to supply the
OM

emergency MCC.
B


A three phase generator has a terminal voltage of 480 V and delivers full load current of
NA


300 A per terminal at a lagging power factor of 75 percent. Calculate the apparent
power in kilovoltamperes.
Select one:
A. 225.25 kVA.
B. 249.12 kVA.
JP




C. 252.25 kVA.
D. 260.55 kVA.
E. 275.89 kVA.
B


In a DCS system, a shared cable communication network is called a:
Select one:

,A. Communication wire.
B. Contact lead.
C. Network.
D. Pneumatic tubing.
E. Data highway.
E


Gaskets in flanges that connect two pipe lengths are usually made out of material that is
_________ than the flange faces.




A
Select one:
A. Harder




VI
B. Tougher
C. Softer
D. Thicker




TU
E. More brittle
C IS
Which of the following benefits/functions is not provided by a conventional globe valve?

Select one:
OM

A. low wear

B. frequent flow control
NA


C. easy repair

D. cost reduction

E. severe throttling
JP




E


The orifice plate has the advantage over other types of metering restrictions because it:
Select one:
A. Produces less permanent pressure drop.
B. Will handle 60% more flow.

, C. Is easy to install and replace.
D. More efficient than the other types.
E. Is permanently attached to the piping.
C


Auto-transformer starting is:
Select one:
A. A type of starting used only on automobiles.
B. A method that connects a motor to a higher voltage tap.




A
C. Not used much because of poor starting torque.
D. Expensive method but capable of giving better starting torque.




VI
E. Are used for starting AC generators.
D




TU
A Bourdon tube has an oval cross section, which is often shaped in the form of a "C",
having an arc span of about:
Select one:
IS
A. 90 degrees.
B. 120 degrees.
C. 180 degrees.
OM

D. 270 degrees.
E. 360 degrees.
D
NA


A watertube boiler, equipped with a superheater, has two pressure relief valves on the
steam drum and one on the superheater. The boiler is fired on pulverized coal and has
70 m² of boiler surface, 95 m² of waterwall surface, and 20 m² of superheater surface.
What is the minimum combined relieving capacity permitted for the three pressure relief
valves?
JP




Select one:
A. 19000 kg/h.
B. 17500 kg/h.
C. 16900 kg/h.
D. 10840kg/h.
E. 8678 kg/h.
D

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