Engineering :: Hydraulics Machines
|
|
|
|
|
|
| 111. |
The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is |
| A. |
24.8 r.p.m. |
B. |
48.2 r.p.m. |
| C. |
82.4 r.p.m. |
D. |
248 r.p.m. |
Answer: Option C
Explanation:
|
| 112. |
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is |
| A. |
slow speed pump with radial flow at outlet |
B. |
medium speed pump with radial flow at outlet |
| C. |
high speed pump with radia flow at outlet |
D. |
high speed pump with axial flow at outlet |
Answer: Option A
Explanation:
|
| 113. |
For centrifugal pump impeller, the maximum value of the vane exit angle is |
| A. |
10? to 15? |
B. |
15? to 20? |
| C. |
20? to 25? |
D. |
25? to 30? |
Answer: Option C
Explanation:
|
| 114. |
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is |
| A. |
slow speed with radial flow at outlet |
B. |
medium speed with radial flow at outlet |
| C. |
high speed with radial flow at outlet |
D. |
high speed with axial flow at outlet |
Answer: Option D
Explanation:
|
| 115. |
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then |
| A. |
no flow will take place |
B. |
cavitation will be formed |
| C. |
efficiency will be low |
D. |
excessive power will be consumed |
Answer: Option B
Explanation:
|
| 116. |
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases. |
Answer: Option B
Explanation:
|
| 117. |
Which of the following pump is suitable for small discharge and high heads? |
| A. |
Centrifugal pump |
B. |
Axial flow pump |
| C. |
Mixed flow pump |
D. |
Reciprocating pump |
Answer: Option D
Explanation:
|
| 118. |
Which of the following pump is preferred for flood control and irrigation applications? |
| A. |
Centrifugal pump |
B. |
Axial flow pump |
| C. |
Mixed flow pump |
D. |
Reciprocating pump |
Answer: Option B
Explanation:
|
| 119. |
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is |
| A. |
slow speed with radial flow at outlet |
B. |
medium speed with radial flow at outlet |
| C. |
high speed with radial flow at outlet |
D. |
high speed with mixed flow at outlet |
Answer: Option D
Explanation:
|
| 120. |
In order to avoid cavitation in centrifugal pumps |
| A. |
the suction pressure should be high |
B. |
the delivery pressure should be high |
| C. |
the suction pressure should be low |
D. |
the delivery pressure should be low |
Answer: Option A
Explanation:
|
Read more:
|
|
