CHAPTER 16-MACHINE FOUNDATION AND CHIMNEY

Foundations are preferably built of concrete in the proportion of what measure of Portland cement; sand; crushed stones?

• A. 1 : 2 : 5

• B. 2 : 4 : 6

• C. 2 : 3 : 5

• D. 1 : 2 : 4

For design stability, the center of gravity of the total combined engine, driven equipment and foundation should be kept _________.

• A. Anywhere

• B. Above the foundation top

• C. In line with surface of the foundation

• D. Below the foundation top

The machine foundation must have a factor of safety of

• A. 4

• B. 5

• C. 6

• D. 7

4. The diesel engine foundation safe soil bearing pressure is:

• A. 4,890 kg/𝑐𝑚2

• B. 4,500 kg/𝑐𝑚2

• C. 4,490 kg/𝑐𝑚2

• D. 4,125 kg/𝑐𝑚2

Anchor bolts in a machine foundation should be embedded in concrete of at least how many times the bolt diameter?

• A. 12

• B. 20

• C. 30

• D. 25

As a good practical rule, the foundation depth may be taken as how many times of the engine stroke?

• A. 2.2 to 3.2

• B. 3.2 to 4.2

• C. 2.5 to 3.5

• D. 3.5 to 4.5

To secure the belts embedded within the foundation, the distance of the edges of the foundation from the bedplate must be _________.

• A. 120 mm to 300 mm

• B. 150 mm to 330 mm

• C. 100 mm to 280 mm

• D. 200 mm to 380 mm

The weight of the machine foundation is how many times of the weight of the engine?

• A. 4 to 5 times

• B. 3 to 5 times

• C. 2 to 3 times

• D. 4 to 6 times

To eliminate transmission of vibration, the foundation should be isolated from floor slabs or building footings at least how many mm around its perimeter?

• A. 15

• B. 20

• C. 25

• D. 30

The minimum vertical distance from the floor or soil level to the top edge of the foundation must be around _________.

• A. 150 mm

• B. 100 mm

• C. 200 mm

• D. 120 mm