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Contains past questions from the 1st class Plumbing Construction Management Engineer Department from 2020 1st to 2011 (2024 to 2011).
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*1st year of Reiwa 6, 1st year of Reiwa 5th, 1st year of Reiwa 4th, 1st year of Reiwa 3rd year, 2020, 2020, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011
is included.
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Example problem
[R6/1st-Problem A-No.1]
Which of the following is an appropriate graph that represents the relationship between residual chlorine concentration and elapsed time after sodium hypochlorite is injected into water and the concentration becomes uniform?
[R6/1st-Problem A-No.2]
In the water tank shown in the figure below, when the height H from the outflow hole to the water surface is tripled to 3H, which is the appropriate magnification for the change in the jet velocity from the outflow hole in the side wall?
However, the water tank is sufficiently large compared to the outflow hole, and the velocity coefficient is assumed to be constant regardless of changes in water level.
[R6/1st-Problem A-No.3]
When air flows in the horizontal pipe shown in the figure below, what is the appropriate velocity of the air at point B?
However, the total pressure at point A is 80Pa, the static pressure at point B is 10Pa, and the density of air is 1.2kg/m3.
[R6/1st-Problem A-No.4]
Which of the following combinations of terms related to fluids are unrelated?
Zhukovsky equation - capillary action
[R6/1st-Problem A-No.5]
The refrigeration cycle of a vapor compression refrigerator is shown on a Mollier diagram as shown below. \nWhich of the following statements regarding this figure is appropriate?
[R6/1st-Problem A-No.6]
Which of the statements about the Carnot cycle shown in the figure below is incorrect?
In isothermal expansion, heat is released to the outside, and in isothermal compression, heat is received from the outside.
[R6/1st-Problem A-No.7]
Which of the following is the appropriate heat transfer rate K [W/(㎡･K)] for heat transfer between the fluid on both sides of the wall shown in the figure below?
However, the thermal conductivity of the wall is λ[W/(m･K)], the thickness L[m], and the surface heat transfer coefficient α1[W/(m2･K)], α2[W/(m²･K)].
[R6/1st-Problem A-No.8]
Which of the following statements regarding solar radiation is inappropriate?
The atmospheric transmittance of solar radiation is mainly influenced by the amount of nitrogen contained in the atmosphere.
[R6/1st-Problem A-No.9]
Which of the following statements regarding state changes in the psychrometric diagram shown below is incorrect?
Humidification by steam spray is shown by moving from the state point to the upper left on the psychrometric diagram (3).
[R6/1st-Problem A-No.10]
Which of the following statements regarding sound is inappropriate?
The higher the frequency, the greater the permissible value of the sound pressure level shown by the NC curve.
[R6/1st-Problem A-No.11]
Which of the following statements regarding three-phase induction motors is incorrect?
Top Runner motors have a lower starting current than standard motors.
[R6/1st-Problem A-No.12]
Which of the following statements regarding electric wires is inappropriate?
When a large number of wires are housed in the same conduit, the allowable current per wire increases.
[R6/1st-Problem A-No.13]
Which of the following statements regarding beam through holes in reinforced concrete buildings is incorrect?
When providing beam through holes, the amount of main reinforcement at the top and bottom of the beam must be increased.
[R6/1st-Problem A-No.14]
Which of the following statements regarding reinforced concrete buildings is inappropriate?
The lower the water-cement ratio, the lower the durability of concrete.
[R6/1st-Problem A-No.15]
Which of the following statements regarding air conditioning plans that are effective in saving energy is inappropriate?
Air conditioning systems using thermal storage methods can level out the power load, but the heat source capacity is larger than non-thermal storage systems.
[R6/1st-Problem A-No.16]
Which of the following statements regarding air conditioning systems is inappropriate?
The combined fan coil unit and duct system generates more air transport power than the all-air system.
[R6/1st-Problem A-No.17]
Which of the following is an appropriate value for the cooling load of the air conditioner coil in the psychrometric diagram during cooling shown in the figure below?
However, the air flow rate is 6000 m3/h and the air density is 1.2 kg/m3.
[R6/1st-Problem A-No.18]
Which of the following statements regarding heat load calculations is inappropriate?
In the cooling load calculation, the effective temperature difference is not used for the north exterior wall.
[R6/1st-Problem A-No.19]
Which of the following combinations of "controlled equipment" and "detection element" is inappropriate in automatic control of a variable air volume single duct system?
[Equipment to control] Air conditioner fan [Detection element] Static pressure in the return air duct
[R6/1st-Problem A-No.20]
Which of the following statements regarding district heating and cooling is inappropriate?
When planning district heating and cooling, it is necessary to find a wide range of users who use heating and cooling at similar times.
[R6/1st-Problem A-No.21]
Which of the following statements regarding heat storage methods is inappropriate?
If the secondary piping system is an open circuit, the pump head will be smaller than if it were a closed circuit.
[R6/1st-Problem A-No.22]
Which of the following is the appropriate minimum amount of ventilation required to keep the indoor carbon dioxide concentration below 1.0×10¯³㎥/㎥?
However, the carbon dioxide concentration in the outside air is 0.4×10¯³㎥/㎥, and the amount of carbon dioxide generated indoors is 0.3㎥/h.
[R6/1st-Problem A-No.23]
Which of the following statements regarding ventilation equipment is inappropriate?
Rooms in which open combustion appliances are used require combustion air, so they should be of type 2 mechanical ventilation and have a more positive pressure than the surrounding rooms.
[R6/1st-Problem A-No.24]
Which of the following statements regarding smoke exhaust equipment is inappropriate?
However, this equipment shall not comply with the evacuation safety verification method (compartment, floor, whole building) of the Building Standards Act or any special structure.
If a smoke exhaust vent is installed on the wall of a room with a ceiling height of less than 3 m, it should be installed in a part where the height from the floor is at least 1/2 of the ceiling height and above the bottom edge of the smoke-proof hanging wall.
[R6/1st-Problem A-No.25]
Which of the following is not an appropriate minimum air volume for each part of the mechanical smoke exhaust system for the two-story building shown in the figure below?
However, this equipment shall not comply with the evacuation safety verification method (compartment, floor, whole building) of the Building Standards Act or any special structure.
Additionally, the smoke exhaust vents on the upper and lower floors shall not be opened at the same time, and the two adjacent smoke-proof compartments may be opened at the same time.
[R6/1st-Problem A-No.26]
Which of the following statements regarding waterworks is inappropriate?
The maximum hydrostatic pressure within the water pipe at the point where the water supply pipe branches from the water pipe shall not exceed 0.98 MPa.
[R6/1st-Problem A-No.27]
Which of the following statements regarding sewerage is inappropriate?
The minimum pipe diameter for separate sewer pipes is generally 150 mm for sewage pipes and 200 mm for storm drains.
[R6/1st-Problem A-No.28]
Which of the following statements regarding water supply equipment is inappropriate?
In the water supply direct pressure increase system, the diameter of the water supply pipe is smaller than that in the pump direct system.
[R6/1st-Problem A-No.29]
Which of the following statements regarding water supply equipment is inappropriate?
An air release valve is installed at the top of standpipes that are directly connected to the water supply system to increase pressure, to prevent negative pressure inside the pipes during a water outage.
[R6/1st-Problem A-No.30]
Which of the following statements regarding hot water supply equipment is inappropriate?
When installing a steam/water separator in the circulation route of a central hot water supply system, install it in a position of high pressure in the piping route.
[R6/1st-Problem A-No.31]
Which of the following statements regarding drainage and ventilation equipment is inappropriate?
Among the countermeasures against the induced siphon effect of traps, the top ventilation method is generally more effective than the loop ventilation method for alleviating the pressure inside the pipe.
[R6/1st-Problem A-No.32]
Which of the following statements regarding drainage and ventilation equipment is inappropriate?
The vent valve can be expected to have the same effect of relieving positive pressure as the top vent pipe that is open to the atmosphere.
[R6/1st-Problem A-No.33]
Which of the following statements regarding drainage and ventilation equipment is inappropriate?
The combined ventilation pipe is branched off using a 45-degree Y joint, etc., from below the part where the drainage horizontal branch pipe from that floor connects to the drainage standpipe, and connected to the ventilation standpipe below the floor surface.
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