CATDOLL : CATDOLL: What are the power and size of drainage pumps? For example, what is the corresponding hourly drainage volume for a 5.5KW 6-inch pump?

1. What are the power and size of drainage pumps? For example, what is the corresponding hourly drainage volume for a 5.5KW 6-inch pump?

This depends on the head. The larger the head, the lower the flow rate. A 5.5kw 6-inch pump has a larger flow rate and a lower head. Here is a data for your reference. The pumps of different companies are different. There are 30 cubic meters of flow and 20m head, and there are also 15 cubic meters of flow and 60m head. You said it is 6 inches, so it is estimated to be about 30 cubic meters of flow. For more electrical knowledge, please visit www.xyyfdq.com

2. What is the national standard single-phase motor rotor diameter?

Single-phase motors should not be designed unilaterally based on electrical performance and technical and economic indicators, but should be designed comprehensively based on the characteristics of the load. Sometimes, in order to meet a certain electrical performance requirement, other performance indicators are reduced. For example, single-phase capacitor-start asynchronous motors used for intermittent loads require high stall torque due to frequent starting, even if the electrical performance is slightly worse during operation. For loads used for long-term continuous operation (such as fans), good operating performance is required. Due to light load starting, a smaller stall torque is not a problem. The rotor of the motor is designed according to the specifications of the stator and the purpose of the motor. The country only finalizes the design and production of some series of products. The rotor diameter of a single-phase motor varies from large to small, ranging from hundreds of mm to 4~5 mm (such as the vibration motor of a mobile phone). How does the country design the standard? Your question can only be answered by saying that the country does not have a standard single-phase motor rotor diameter.

3. What is the size of the cervical spinal canal in a normal adult male?

c1:15.91mm

c2:14.00mm

c3:13.35mm

c4:13.80mm

c5:13.90mm

c6:14.23mm

c7:14.68mm

This is an average value. There may be slight differences from person to person.

4. There are two balls A and B on a smooth horizontal plane. Their momentums are 10kg·m/s and 15kg·m/s respectively. Both are heading east. Ball A is behind ball B. When ball A catches up with ball B, the two balls collide. After the collision, the momentums of balls A and B may be ( ) respectively (process required)

A is wrong, because collision consumes energy, and E=P2/2M

D is wrong, for the same reason as A

C is wrong. If the collision occurs from behind, how is it possible that the speed can increase in the same direction?

5. Density comparison: salt, water, air, nitrogen, hydrogen

Salt (NaCl 36.5) Air (29) Nitrogen (28) Water (18) Hydrogen (2)

If we compare the density, we can judge it by looking at their chemical formula. Then the average relative molecular mass of air is 29, which is stipulated.