3A2 absa exam. Questions with accurate answers
_____ control operates to prevent errors from occurring in the first
place.
Select one:
a. Feedback
b. Feed-forward
c. Proportional
d. Proportional plus reset
e. Proportional plus reset plus derivative Ans✓✓✓ b
A boiler drum is made of SA-515-70 steel and has a ligament efficiency
of 0.66. If the steam temperature is 280°C and the inside diameter of the
drum is 1.6 m, what will the maximum operating pressure be, in kPa?
Use S = 136 MPa and t = 68.5 mm.
Select one:
a. 2500 kPa.
b. 6500 kPa.
c. 7310 kPa.
d. 5200 kPa.
e. 5800 kPa. Ans✓✓✓ c
A fire extinguishing agent based upon mixtures of ammonium
phosphates and sulphates is referred to as _____________..
Select one:
,a. Mixed chemical.
b. Multi-purpose dry chemical.
c. Aqueous foam.
d. Red B.
e. Purple K. Ans✓✓✓ b
A seamless, welded, full-hemispherical head is welded to a boiler shell
that has an inside diameter of 1100 mm. Maximum working pressure is
3500 kPa, the material is SA-226, and operating temperature is 300°C.
The head has a flanged in manhole that meets code requirements.
Calculate the minimum required thickness for the head. Use S = 81
MPa.
Select one:
a. 45.55 mm.
b. 60.55 mm.
c. 22 mm.
d. 52.87 mm.
e. 40.22 mm. Ans✓✓✓ a
A simple electric circuit consists of:
Select one:
a. Source, load, resistance.
b. Conductor, load, source.
c. Current, resistance, conductor.
d. Voltage, current, conductor.
, e. Voltage, inductance, conductance. Ans✓✓✓ b
A stoker-fired firetube boiler has 100 m² of heating surface. How much
steam must the pressure relief valves on this boiler be capable of
discharging per hour?
Select one:
a. 3400 kg/h.
b. 2850 kg/h.
c. 2500 kg/h.
d. 5500 kg/h.
e. 4000 kg/h. Ans✓✓✓ a
An angle-style valve could be described as:
Select one:
a. May not be used as an elbow despite having inlet and outlet flanges at
right angles.
b. Often having several ports but only one plug
c. Commonly single-ported.
d. High-pressure double-ported globe bodies or plug type.
e. Always an on/off valve. Ans✓✓✓ c
Approved shops are authorized to perform the work described in their
Quality Control Program for a period of _____ years.
Select one:
_____ control operates to prevent errors from occurring in the first
place.
Select one:
a. Feedback
b. Feed-forward
c. Proportional
d. Proportional plus reset
e. Proportional plus reset plus derivative Ans✓✓✓ b
A boiler drum is made of SA-515-70 steel and has a ligament efficiency
of 0.66. If the steam temperature is 280°C and the inside diameter of the
drum is 1.6 m, what will the maximum operating pressure be, in kPa?
Use S = 136 MPa and t = 68.5 mm.
Select one:
a. 2500 kPa.
b. 6500 kPa.
c. 7310 kPa.
d. 5200 kPa.
e. 5800 kPa. Ans✓✓✓ c
A fire extinguishing agent based upon mixtures of ammonium
phosphates and sulphates is referred to as _____________..
Select one:
,a. Mixed chemical.
b. Multi-purpose dry chemical.
c. Aqueous foam.
d. Red B.
e. Purple K. Ans✓✓✓ b
A seamless, welded, full-hemispherical head is welded to a boiler shell
that has an inside diameter of 1100 mm. Maximum working pressure is
3500 kPa, the material is SA-226, and operating temperature is 300°C.
The head has a flanged in manhole that meets code requirements.
Calculate the minimum required thickness for the head. Use S = 81
MPa.
Select one:
a. 45.55 mm.
b. 60.55 mm.
c. 22 mm.
d. 52.87 mm.
e. 40.22 mm. Ans✓✓✓ a
A simple electric circuit consists of:
Select one:
a. Source, load, resistance.
b. Conductor, load, source.
c. Current, resistance, conductor.
d. Voltage, current, conductor.
, e. Voltage, inductance, conductance. Ans✓✓✓ b
A stoker-fired firetube boiler has 100 m² of heating surface. How much
steam must the pressure relief valves on this boiler be capable of
discharging per hour?
Select one:
a. 3400 kg/h.
b. 2850 kg/h.
c. 2500 kg/h.
d. 5500 kg/h.
e. 4000 kg/h. Ans✓✓✓ a
An angle-style valve could be described as:
Select one:
a. May not be used as an elbow despite having inlet and outlet flanges at
right angles.
b. Often having several ports but only one plug
c. Commonly single-ported.
d. High-pressure double-ported globe bodies or plug type.
e. Always an on/off valve. Ans✓✓✓ c
Approved shops are authorized to perform the work described in their
Quality Control Program for a period of _____ years.
Select one:
