1. Fill in the blanks: (65438+ 0 point for each question, a total of 30 points)

1, and figure (a) is a combination knot which is changed from two simple knots. Please write down the names of these two simple knots: Bailing Knot and Ruyi Knot.

Figure (a) Figure (b)

2. Figure (b) is a schematic diagram of decorative knots in the process of compilation. Please write down the compilation method corresponding to the number:

1, ① _ pressure, ② wear _ _ _

2, 3, food carving commonly used knife methods are cutting, cutting, carving, spinning _ and poking.

3.4. In hand sewing, the common stitch method for sewing cloth is the reverse stitch (or lock stitch) method, and the common stitch (or lock stitch or triangle stitch) method is used to deal with the welt of cloth. 5. In the process of woodworking, there are usually the following four ways to connect wooden parts. Please fill in the corresponding name according to the picture:

_ _ _ tenon connection _ _ _, hinge connection _ _ _ glue connection _ _ _ _ nail connection _ _ _.

6. The small woodworking combined machine tool is a kind of small processing equipment which integrates many functions of machine tools. Please write the names of these combined small machine tools according to the pictures:

Drilling machine, sawing machine, lathe, grinder.

7. Connection is one of the basic skills of metal wire forming. The connection methods are _ _ _ _ _ _ connection and _ _ _ _ _ connection.

8, the connection between electronic components, commonly used are _ _ _ _ _ _ _ welding method and _ _ _ _ _ _ welding method.

9. Fill in the names and symbols of electronic components in the circuit on the corresponding horizontal lines.

① ② ③ ④ ⑤

① Component name and symbol: resistor ② Component name and symbol: capacitor ③ Component name and symbol: diode ④ Component name and symbol: triode.

⑤ Component name and symbol: LED.

10, the characteristic of crystal diode is _ _ unidirectional conduction _, and the function of transistor is _ _ amplification _ or _ _ switch _.

2. Short answer questions: (5 points for each question, 20 points in total)

1, "Food Carving" pays attention to using materials with knives. Excuse me:

(1) food carving knives are divided into flat knives and notched knives. How many kinds of grips are there? (3 points)

Generally, there are horizontal grips (thumb grips the bottom of the blank, four fingers grips the handle), straight grips (four fingers grips the handle, thumb sticks to the inside of the handle) and pen grips (thumb and forefinger grips the handle).

(2) What materials can be used to carve Dahlia? ( 1)

You can choose radish or potato, which is beautiful.

2. The model making of steel wire bicycle can be divided into three steps: blanking, bending and connecting. Please answer:

(1) What tools are there for blanking? ( 1)

You can cut it with diagonal pliers or wire cutters.

(2) What molding method can be used to bend the metal wire into a wheel? (2 points)

Circular contours can be used for bending and forming.

(3) How is the front fork connected with the car body? ( 1)

The method of winding connection can be adopted.

3. pointer multimeter is a commonly used measuring instrument. Excuse me:

(1) When measuring resistance, don't touch the two pins of the component with human fingers at the same time. Why? (2 points)

If the hand touches the two pins of the resistor at the same time, it may be that the human body is connected in parallel with the resistor, resulting in a small measurement value.

(2) When measuring voltage, if the range of its value is unknown, should the range switch be placed in the high voltage range or the low voltage range? (1) High pressure gear should be selected.

(3) When measuring whether the diode is conducting forward, should the anode of the diode be connected with a red bar or a black bar? ( 1)

Connect the battery to the multimeter when the multimeter is placed in the resistance range. The red rice stick is the negative pole and the black rice stick is the positive pole, so the black rice stick should be connected.

(4) After using the multimeter, the range switch should be placed in the maximum range of AC voltage. Why? (2 points)

This is to prevent the instrument from being damaged and may cause safety accidents when the next measurement is made without carefully selecting the measuring range and rashly switching on the circuit with higher voltage.

4. Answer the questions according to the lighting circuit shown in the picture:

(1) Why should the phase (fire) line be closed? ( 1)

The phase (fire) wire is connected to the switch, which can ensure that the lamp is completely disconnected from the power supply after the switch is turned off, thus ensuring personal safety.

(2) Can the fuse be installed on the ground wire? Why? (2 points)

You can't. Because if the grounding wire is connected with a fuse, once it is loose or the fuse is blown, the grounding system will be disconnected and lose the function of preventing electric shock. In this way, when the electrical shell is charged, it will endanger personal safety.

(3) If the lamp uses a screw cap, what wire should be connected to its central copper plate? ( 1)

The central copper sheet should be connected with the switch wire.

(4) What happens if the phase (fire) wire is connected to the grounding wire hole of the three-eye socket? (2 points)

If the phase (fire) wire is connected in the grounding wire hole, once the plug is plugged in, the electrical shell will be charged immediately, which is dangerous to people. At the same time, electrical appliances can't be used normally.

Three. Operation problem: (50 points)

Use the electronic components, tools and materials provided by the test center to weld the darkroom alarm circuit according to the following requirements. When the external strong light shines on the photoresistor, the LED V 1 gives a warning, and when there is no light on the photoresistor, the LED V 1 goes out.

1. Read the following circuit diagram and printed circuit diagram, and insert five electronic components, namely variable resistor RP, fixed resistor R, photosensitive resistor RL, light-emitting diode V 1 and transistor V2, into the corresponding holes on the printed circuit board correctly; (20%)

2, welding electronic components, action specification, component pin length is moderate, solder joint is firm and beautiful, no virtual welding; After welding, unplug the soldering iron; (20%)

3. Connect a 3V DC power supply, and adjust the variable resistor RP to make the LED V 1 just emit light. When the LED V 1 goes out, cover the photoresistor RL with black paper. ( 10%)