Power Engineering MCQ: Power Engineering Chapter 59

Power Engineering Chapter 59

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If a boiler has more than 500ft of water heating surface and power input more than 1100 kw how many relief valves are required?

A. 1
B. 2
C. 3
D. 4

Answer: B

How many relief valves a boiler should have?

A. 1
B. 2
C. 3
D. 4

Answer: A

Which code provides recommendations for the testing, operation and maintenance of safety valves?

A. ASME code section I
B. ASME code section II
C. ASME code section IV
D. ASME code section VIII
E. ASME code section VII

Answer: E

Temperature relief device opens when water temperature rises to about

A. 95C
B. 99C
C. 96C
D. 94C
E. 98C

Answer: B

Which one is NOT a cause for a relief valve in a heating boiler that is opening or spilling?

A. Scale will form if the temperature of the heater is below 65C
B. Pressure in the supply line varies and at times exceeds the setting of the valve.
C. Relief valve is defective
D. Hot water system has become water logged

Answer: A

Who can repair a safety valve?

A. Boiler operator only if fully qualified to do so and authorization from the chief inspector
B. Manufacture
C. Authorized repair representative
D. All of the above

Answer: D

When should the pop test be performed?

a. Weekly
b. Monthly
c. Semi-annually
d. Annual
e. Bi-weekly

Answer: D

The try lever test should not be used on low pressure boilers unless pressure is at least

A. 33 kPa
B. 36 kPa
C. 35 kPa
D. 32 kPa
E. 31 kPa

Answer: C

The main advantage of the torsion bar safety valve is

A. Used on high pressure boilers
B. Machined to much finer specifications
C. More durable than safety valves
D. None of the above

Answer: B

Torsion bar safety valve is designed for use on boilers operating at?

A. 6000 kPa
B. 4000 kPa
C. 7000 kPa
D. 8000 kPa
E. 5000 kPa

Answer: D

Superheater safety valves has a exposed spring because?

A. Prevent high temperature from destroying the spring
B. Prevent high pressure from destroying the spring
C. Prevent the spring from corrosion
D. None of the above

Answer: A

Cast-iron safety valve is are not used on what?

A. Boilers
B. Heating Boilers
C. Superheaters
D. Electric Boilers
E. Reheater

Answer: C

Cast-iron safety valve is suitable for pressures up to?

A. 1700 kPa
B. 1720 kPa
C. 1740 kPa
D 1760 kPa
E. 1780 kPa

Answer: B

The safety valve popping pressure may be increased or decreased by a maximum of?

A. 3%
B. 2%
C. 5%
D. 4%
E. 6%

Answer: C

A wire seal on a safety valve is installed by

a. a power engineer
b. boiler inspector
c. an engineer
d. an ASME-certified valve repair agency
e. an industrial insurance adjuster

Answer: B

Which code states that "Pressure relief valves shall be designed and constructed without chattering"

A. ASME Code Section I, PG 68
B. ASME Code Section I, PG 67.2
C. ASME Code Section I, PG 72.1
D. ASME Code Section IV, PG 68
E. ASME Code Section IV, PG 67.2

Answer: C

The difference between the pressure at which the valve opens and closes is called?

A. Popping pressure
B. Blowdown
C. Discharge
D. None of the above

Answer: B

The pop chamber is provided with what that allows steam to escape from under the skirt?

A. Blowdown ring
B. Escape port
C. Seat
D. Spindle
E. Valve disc

Answer: B

Another name for the pop chamber is?

A. Skirt chamber
B. Escape chamber
C. Huddling chamber
D. Spindle chamber
E. Spring chamber

Answer: C

Another name for the lip on a safety valve is?

A. Skirt
B. Escape port
C. Seat
D. Spindle
E. Pop Chamber

Answer: A