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1. Hello, according to your description of the situation, living with AIDS patients for several years, to the CDC examination is negative, indicating that you are less likely to be infected with AIDS. As long as you do not have high risk factors of HIV infection, do not come into contact with the blood or vaginal secretions of AIDS patients, semen, and its blood or vaginal secretions, semen does not come into contact with your damaged blood vessels, generally will not be infected. If you are not at ease, you can go to review every other month. I hope my answer can help you.

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3. Men and women check is not the same, it is recommended to go to a regular hospital to check, determine what causes, timely symptomatic treatment can. The diet is light and easy to digest food, avoid stimulating food. I wish you good health!

4. Intermediate maintenance electrician simulation test question (3) refer to answer 1, multiple choice question (choose the correct answer, fill the corresponding letter in the brackets. 1 point for each question. Full Score: 60): 1. The internal resistance of a current source is 2 Ω， When it is equivalently transformed into a 10V voltage source, the current of the current source is () A) 5A (b) 2A (c) 10A (d) 2.5A 2. The effective value of a sinusoidal alternating current is 10a, the frequency is 50 Hz, and the initial phase is - 30 °， Its analytic expression is () A) (b) (c) (d) 3 A) (b) (c) (d) 4. In RC series circuit, the relationship among apparent power, active power P and reactive power is () A) (b) (c) (d) 5. When three-phase symmetrical load is connected in triangle, the phase current is 10a, and the closest value between line current and phase current is () a A) 14 (b) 17 (c) 7 (d) 20 6. The low frequency oscillation signal of low frequency signal generator is generated by () oscillator A) LC (b) inctance three-point (c) capacitance three-point (d) RC 7. The low frequency signal generator can be used after it is turned on A) Soon (b) after heating for 1 minute (c) after heating for 20 minutes (d) after heating for 1 hour 8 A) First press the power button, then press the galvanometer button (b). First press the galvanometer button, then press the power button (c). At the same time, press the power button and galvanometer button (d). There is no need to consider the order of pressing the power button and galvanometer button. 9. When the light spot of the oscilloscope is too bright, adjust the () A) Gather knob (b) brightness knob (c) Y-axis increase knob (d) X-axis increase knob 10. DC double arm bridge should use battery with larger capacity as far as possible, and the general voltage is () v A) 2-4 (b) 6-9 (c) 9-12 (d) 12-24 11. For oscilloscopes that are not used for a long time, power on at least once every () months A) Three (b) five (c) six (d) ten 12 judge whether the galvanometer coil is on or off () to measure A) R of multimeter × R of 1 (b) multimeter × The phase of primary side power supply voltage is ahead of the phase of main magnetic flux in the core, and slightly greater than (), when the 1000 (c) bridge (d) can not be operated with Multimeter or bridge directly under the load of 13 transformer A180 ° ( B)90 ° ( C) 60 ° ( D) 30 ° To improve the power factor of power load of enterprise, the voltage regulation rate of transformer will be increased A) When three-phase transformers are in parallel operation, the ratio of three-phase transformers in parallel operation is required (), otherwise they cannot be in parallel operation A) Must be absolutely equal (b) with an error of not more than ± The error of 0.5% (c) does not exceed ± The error of 5% (d) is not more than 5% ± The core of magnetic saturation reactor of 10% 16 rectifier DC welding machine is composed of () type core A) One "port" (b) three "ports" (c) one "day" (d) three "days" (d) 17. The secondary voltage of rectifier type DC welding machine is too low, and its fault reason may be () A) Transformer primary coil inter turn short circuit (b) saturation reactor control winding connected inversely (c) regulator resonant coil short circuit (d) regulator compensation coil turns inappropriate 18. In the regular inspection and maintenance of small and medium power transformers, if the temperature difference between the top oil level of transformer tank and room temperature exceeds (), it means that the transformer is overloaded or the transformer has internal fault A35 ° C (B) 55 ° C (C) 105 ° C (D) 120 ° C 19. During the withstand voltage test of transformer, if there is no breakdown phenomenon in the test, the test voltage of transformer shall be reced evenly to ()% or less of the test voltage in about 5 seconds, and then the power supply shall be cut off A) 15 (b) 25 (c) 45 (d) 55 20. The test voltage for withstand voltage test of power transformer after overhaul shall be selected according to the voltage standard for handover and preventive test. The test voltage of oil immersed transformer with voltage level of 6kV specified in the standard is () kV A) 15 (b) 18 (c) 21 (d) 25 21. When starting asynchronously, the excitation winding of synchronous motor should not be short circuited directly, otherwise () A) If the current is too high, the motor will heat up (b) and affect personal safety (c) and cause leakage noise (d). The speed can not rise to nearly synchronous speed and can not start normally. 22. For small DC motor without commutation pole, the constant load rotates to one direction, The brush can be turned along the armature at the geometric neutral plane A) Move forward appropriately β Angle (b) moves back appropriately β Angle (c) moves forward 90 ° ( D) The sensitivity of () series high sensitivity DC tachogenerator developed in our country is 1000 times higher than that of variable speed generator. It is especially suitable for speed detection in low speed servo system A) CY (b) ZCF (c) CK (d) CYD 24 A) No additional excitation power supply is needed (b) excitation power supply is needed (c) AC excitation voltage is needed (d) DC excitation voltage is needed 25 A) High output power (b) low output power (c) fast response to control voltage (d) slow response to control voltage A) Stator winding connected to signal voltage, rotor winding connected to excitation voltage (b) stator winding connected to excitation voltage, rotor winding connected to signal voltage (c) stator winding and rotor winding connected to signal voltage (d) stator winding and rotor winding connected to excitation voltage 27. The basic structure of electromagnetic speed regulating asynchronous motor is divided into two categories A) In the automatic high-speed control circuit of slip motor, the tachogenerator is mainly used as () component A) Amplify (b) controlled (c) execute (d) test 29. When using electromagnetic speed regulating asynchronous motor to adjust speed automatically, change the control angle α Just change () A) The input voltage of the main circuit (b) the input voltage of the trigger circuit (c) the amplification factor of the amplification circuit (d) the output voltage of the trigger circuit 30. The direction of the reaction flux of the direct axis armature of the AC motor expander is () A) The direction of control flux is the same (b) the direction of control flux is opposite (c) the direction of vertical control flux (d) is uncertain 31. When the voltage withstand test of AC motor is carried out, the test voltage is () V (a) 500 (b) 1000 (c) 1500 (d) 2000 for the motor with rated voltage of 380V and power within 1-3kw 32. When the voltage withstand test is carried out for the DC motor with power above 1kW, The test voltage of the finished proct is () v A2UN+1000 (B) 2UN+500 (C) 1000 (D) 500

5. Intermediate maintenance electrician simulation test question (3) reference answer
1. Multiple choice question (choose the correct answer and fill the corresponding letter in the brackets. 1 point for each question. The full score is 60 points):
1. The internal resistance of a current source is 2 Ω， When it is equivalently transformed into a 10V voltage source, the current of the current source is ()< (a) 5A (b) 2A (c) 10A (d) 2.5A
2. The effective value of a sinusoidal alternating current is 10a, the frequency is 50 Hz, and the initial phase is - 30 °， Its analytic expression is ()
(a) (b)
(c) (d)
3
(a) (b)
(c) (d)
4. In RC series circuit, the relationship among apparent power, active power P and reactive power is ()< When three-phase symmetrical load is connected in triangle, the phase current is 10a, and the closest value between line current and phase current is () a
(a) 14 (b) 17 (c) 7 (d) 20
6. The low frequency oscillation signal of low frequency signal generator is generated by () oscillator
(a) LC (b) inctance three-point (c) capacitance three-point (d) RC
7. The low frequency signal generator can be used () after it is turned on
(a) soon (b) after heating for 1 minute (c) after heating for 20 minutes (d) after heating for 1 hour
8
(a) press the power button first, then the galvanometer button (b) press the galvanometer button first, then the power button
(c) press the power button and galvanometer button at the same time (d) there is no need to consider the order of pressing the power button and galvanometer button
9. When the light spot of the display tube is too bright, it should be adjusted ()
(a) focus knob (b) brightness knob (c) Y-axis increase knob (d) X-axis increase knob
10. DC double arm bridge should use battery with larger capacity as far as possible, and the general voltage is () v
(a) 2-4 (b) 6-9 (c) 9-12 (d) 12-24
11. For oscilloscopes that are not used for a long time, power on at least once every () months
(a) three (b) five (c) six (d) ten
12 judge whether the galvanometer coil is on or off () to measure
(a) r of multimeter × R of 1 (b) multimeter × When the 1000 (c) bridge (d) can not be directly operated with a multimeter or bridge, the phase of the primary side power supply voltage is ahead of the phase of the main magnetic flux in the core, and slightly greater than ()< br />A180 ° ( B)90 ° ( C) 60 ° ( D) 30 °
14 to improve the power factor of the power load of the enterprise, the voltage regulation rate of the transformer will be increased< When three-phase transformers are in parallel operation, the ratio of three-phase transformers in parallel operation is required (), otherwise they cannot be in parallel operation
(a) must be absolutely equal, and (b) must not exceed ± The error of 0.5% (c) does not exceed ± The error of 5%
(d) is less than 5% ± 10%
the core of magnetic saturation reactor of 16 rectifier DC welding machine is composed of () shaped core
(a) one "port" (b) three "ports" (c) one "day" (d) three "days"
17. The secondary voltage of rectifier DC welding machine is too low, and its fault may be caused by ()
(a) transformer primary coil inter turn short circuit (b) saturation reactor control winding reversed (c) regulator resonant coil short circuit
(d) regulator compensation coil turns inappropriate
18, It indicates that the transformer is overloaded or the internal fault of the transformer has occurred< br />A35 ° C (B) 55 ° C (C) 105 ° C (D) 120 ° C
19. If there is no breakdown phenomenon in the transformer withstand voltage test, the test voltage of the transformer should be reced evenly to ()% or less of the test voltage in about 5 seconds, and then the power supply should be cut off< (a) 15 (b) 25 (c) 45 (d) 55
20. The test voltage for withstand voltage test of power transformer after overhaul should be selected according to the voltage standard for handover and preventive test. The test voltage of oil immersed transformer with voltage level of 6kV specified in the standard is () kV
(a) 15 (b) 18 (c) 21 (d) 25
21. When starting asynchronously, the excitation winding of synchronous motor should not be short circuited directly, otherwise ()
(a) too much current will cause motor heating (b) high electric heating will affect personal safety
(c) leakage noise will occur (d) speed can not rise to close to synchronous speed, can not start normally
22. For small DC motor without commutation pole, constant load will rotate to one direction, in order to improve commutation, The brush can be turned along the armature at the geometric neutral plane
(a) move forward appropriately β Angle (b) moves back appropriately β Angle (c) moves forward 90 ° ( D) Move backward to the axis of main magnetic pole
23. The sensitivity of () series high sensitivity DC tachogenerator developed in China is 1000 times higher than that of variable speed generator, which is especially suitable for speed detection in low speed servo system< (a) cy (b) ZCF (c) CK (d) CYD
24
(a) no additional excitation power supply (b) excitation power supply (c) AC excitation voltage (d) DC excitation voltage
25. Low inertia DC servo motor()< (a) high output power (b) low output power (c) fast response to control voltage (d) slow response to control voltage
26. The correct wiring mode of separately excited DC servo motor is ()
(a) stator winding connected with signal voltage, rotor winding connected with excitation voltage (b) stator winding connected with excitation voltage, rotor winding connected with signal voltage (c) both stator winding and rotor winding connected with signal voltage (d) both stator winding and rotor winding connected with excitation voltage
27. The basic structure types of electromagnetic speed regulating asynchronous motor are divided into two categories
(a) combined type and separate type (b) combined type and integral type (c) integral type and independent type (d) integral type and separate type
28. In the automatic high-speed control circuit of slip motor, the tachometer generator is mainly used as () component
(a) amplify (b) controlled (c) execute (d) test
29. When using electromagnetic speed regulating asynchronous motor for automatic speed regulation, to change the control angle α Just change ()
(a) the input voltage of the main circuit (b) the input voltage of the trigger circuit (c) the amplification factor of the amplification circuit (d) the output voltage of the trigger circuit
30< (a) same as the control flux direction (b) opposite to the control flux direction (c) vertical control flux (d) uncertainty
31, The test voltage is () V
(a) 500 (b) 1000 (c) 1500 (d) 2000
32. When the DC motor with power above 1kW is subjected to withstand voltage test, the test voltage of the finished proct is () v
(a) 2un + 1000 (b) 2un + 500 (c) 1000 (d) 500
I hope it can help you.

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