1: Xác định phụ tải tính toán và phụ tải đỉnh nhọn của nhóm thiết bị sau: STT Tên thiết bị

Số
Lượng
Pđm
(KW)
Cos

Ksd Kmm
1. Máy tiện 1 10 0,6 0,16 7
2. Máy bào 2 8 0,8 0,17 6
3. Máy mài 1 6 0,65 0,16 5
4. Máy cưa 2 5 0,7 0,14 5
5.
Máy hàn (

= 49%)
Uđm= 220V

1 20KVA 0,65 0,2 4

6. Cầu trục (

= 25%) 1 15 0,8 0,2 3

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Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?