In the selection step of mobile crane, under the selected working conditions, it is necessary to check ( ).
a. Working condition parameters.
b. The crane arm is long.
c. Rated lifting capacity.
d. Safe distance.
Answer: D Analysis: 2020 version of the textbook P36 This question examines the parameters and use requirements of mobile cranes. The mobile crane calculates the safety distance between the legs, counterweights, booms and spreaders, and the lifted objects of the crane and the surrounding buildings under the selected working conditions.
Multiple choice question] The following automatic instrument installation and construction procedures are correct ( ).
a. Installation of source components, cable laying, installation of instrument pipes, and calibration of instrument monomer. Adjust the installation.
b. Installation of source components and calibration of instrument monomer. Adjustment Installation, Cable Laying, Instrumentation Duct Installation.
c. Installation of source components, installation of instrument pipes, cable laying, and calibration of instrument monomer. Adjust the installation.
d. Installation of source components, cable laying, instrument unit calibration. Adjust the installation of the instrumentation duct installation.
Answer: B Analysis: This question examines the main construction procedures of automation instrument installation. Part of the construction procedure sequence of the automatic instrument installation construction procedure is as follows: installation of source components, calibration and adjustment of instrument monomer, cable laying, and installation of instrument pipeline.
Multiple choice] The following description of metal air duct reinforcement is wrong ( ).
a. Rectangular air ducts with side lengths greater than 630mm should be reinforced.
b. Rectangular insulation air ducts with side lengths greater than 800mm should be reinforced measures.
c. The unilateral plane area is greater than 12m2 low-pressure rectangular air duct, reinforcement measures should be taken.
d. For medium pressure rectangular air ducts with a pipe length greater than 1250mm, angle steel reinforcement measures should be taken.
Answer: D Analysis: 2020 edition of textbook P147 "Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Engineering" GB 50243-2016 No. 42.Paragraph 3 of Article 3 stipulates that the length of the metal rectangular air duct is more than 630mm or the length of the rectangular insulation air duct is more than 800mm, and the length of the pipe section is greater than 1250mm; or the unilateral plane area of the low-pressure air duct is greater than 12m2, medium and high pressure air duct is greater than 10m2, there should be reinforcement measures.
Multiple choice question] Enterprises and institutions must apply for assessment to the people's metrology administrative department at the same level as their competent departments. Only those who have obtained the certificate after the assessment can use it.
a. Standard measuring instruments.
b. Working measuring instruments.
c. The highest measurement standard.
d. Imported measuring instruments.
Answer: C Analysis: The 2020 edition of the textbook P332 Enterprises and institutions must apply for assessment to the people's ** measurement administrative department at the same level as their competent departments to establish the highest measurement standards of their own units.
Multiple choice question] According to the general procedure of mechanical equipment installation, the correct order in the following processes is ( ).
a. Basic inspection and acceptance, equipment hoisting in place, horn setting, equipment installation and adjustment, equipment fixing and grouting.
b. Basic inspection and acceptance, horn setting, equipment hoisting in place, equipment installation and adjustment, equipment fixing and grouting.
c. Equipment hoisting in place, foundation inspection and acceptance, horn setting, equipment installation and adjustment, equipment fixing and grouting.
d. Basic inspection and acceptance, horn setting, equipment hoisting in place, equipment fixing and grouting equipment installation adjustment.
Answer: B Analysis: The general procedures for the installation of mechanical equipment in the 2020 version of the textbook P48 are: construction preparation, equipment unpacking inspection, foundation measurement and pay-off, basic inspection and acceptance, horn setting, equipment hoisting in place, equipment installation and adjustment, equipment fixing and grouting, parts cleaning and assembly, lubrication and equipment refueling, equipment commissioning, and engineering acceptance.
Multiple choice question] The use of construction machinery and tools implements the principle of "man-machine fixation", and its "three determinations" system does not include ( ).
a. Set the machine. b. Determine people.
c. Regular training.
d. Set job responsibilities.
Answer: C Analysis: 2020 Edition Textbook P205 This question mainly examines the three fixed systems, the original text is (2) The use of construction machinery and tools should implement the principle of "man-machine fixation", and implement the "three fixed" system of fixed machines, fixed people, and fixed post responsibilities. Implement the special person responsibility system for important construction machinery and equipment, the captain responsibility system and the operator certificate system.
Multiple choice questions] (2020 real questions) In the statement about the erection and test of power overhead lines, the correct ones are ( ).
a. The resistance of the wire connection should not exceed 2 times of the resistance of the wire of the same length.
b. Check that the phases on both sides of each phase of the overhead line should be consistent.
c. The impact closing test of the no-load line should be carried out 3 times under the rated voltage.
d. The mechanical strength of the wire connection should not be less than 90% of the thermometer of the wire strength
e. Infrared thermometer can be used to check the connection quality of the wire joint.
Answer: BCE
Analysis: P61-74 wire connection requirements: (1) The wire connection should be in good contact, and its contact resistance should not exceed 1 of the resistance of the wire of the same length2 times; (2) The wire connection should have sufficient mechanical strength, and its strength should not be less than 95% of the wire strength; Power overhead line test: 1. The insulation resistance of the measured line should not be less than that specified in the acceptance specification; 2. Check that the phases on both sides of each phase of the overhead line should be consistent; 3. The impact closing test of the no-load line should be carried out 3 times under the rated voltage; 4. The lightning protection grounding wire of the tower is welded with the grounding device, and the grounding resistance value of the tower should be measured in accordance with the provisions of the design; 5. Use an infrared thermometer to measure the temperature of the wire joint to check the connection quality of the joint.
Multiple choice questions] Aluminum and aluminum alloy welding are prone to defects ( ).
a. Stomatae. b. Cracks.
c. Slag inclusion. d. Not welded through.
e. White dots. Answer: ACD
Analysis: 2020 edition of textbook P37 aluminum and aluminum alloy: the chemical binding force of aluminum and oxygen is very strong, and it is easy to generate a layer of oxidation film on the surface of the molten droplet and cover the surface of the solution pool, which hinders the normal progress of the welding process; It is easy to produce non-fusion and non-welding penetration defects; It is easy to create slag inclusion in welding; It will cause the weld to form porosity.
Multiple choice questions] The principle of hoisting boiler components is (). 2012
a. First up and then down.
b. Small first and then large.
c. First on both sides and then in the middle.
d. First center, then before and after the furnace.
e. First the periphery and then the interior.
Answer: ACD
Analysis: Examination content: boiler equipment installation technology. The principle of hoisting boiler components: first up and then down, first on both sides and then in the middle, first in the middle and then gradually in front of the furnace and behind the furnace.
Multiple choice questions] Commonly used wire rope loops for lifting and hoisting can be divided into ( ) according to the structural form
a. Wire rope loop.
b. Fiberglass core.
c. Aluminum alloy core.
d. Cable ring cable.
e. Aluminum stranded core.
Answer: AD analysis: 2020 edition of the textbook P29 steel wire rope ring cable can be divided into wire rope ring cable and cable ring cable according to the structural form.