When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be

A

Horizontal

B

Nearly horizontal

C

Steep

D

First rise and then fall

একটি পানিপূর্ণ কুয়ার গভীরতা 20m ও ব্যাস 2 m. কুয়াটিকে পানি শূণ্য করার জন্য 5 HP এর একটি পাম্প লাগানো হল। অর্ধেক পানি তোলার পর পাম্পটি নষ্ট হয়ে গেল। বাকি পানি তোলার জন্য একই ক্ষমতা সম্পন্ন আর একটি পাম্প লাগানো হল। প্রথম পাম্প দ্বারা সম্পাদিত কাজের পরিমান নির্ণয় কর।(The depth and diameter of a water filled well are 20 m and 2 m respectively. An engine of 5 HP is attached to pump out the water. The pump was ruined after emptying half of the water. Then another pump of same capacity was attached to pump out rest of the water. Determine the work done by first pump.)

A

2.54 × 104 J

B

1.44 × 104 J

C

2.34×104 J

D

1.54 × 104 J

E

1.54 ×104 J

Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?

A

72

B

75

C

84

D

96

A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump

A

Develops a lower head

B

Capacity is reduced

C

Requires more power

D

All of the above

In a weight-lifting competition, the total weight of Joe's two lifts was 750 pounds. Twice the weight of his first lift was 300 pounds more than the weight of his second lift. What was the weight, in pounds, of his first lift?

A

225

B

275

C

325

D

350

In a weight -lifting competion, the total weight of Jabir's two lifts was 750 pounds. Twice the weight of this lift was 300 pounds more than the weight of his secnd lift. What was the weight , in pounds, of his first lift?

A

225

B

275

C

325

D

350

If the tension in a cable supporting a lift moving upwards is twice the tension when the lift is moving downwards, the acceleration of the lift, is

A

$$\frac{{\text{g}}}{2}$$

B

$$\frac{{\text{g}}}{3}$$

C

$$\frac{{\text{g}}}{4}$$

D

$$\frac{{\text{g}}}{5}$$

Actual lift of a pump is always less than the theoretical lift and is limited by the

A

Specific gravity & temperature of the liquid

B

Leakage & pressure decreasing at higher elevations

C

Frictional resistance through pipes, fittings & passages

D

All of the above

If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

A

$${\text{H}} = \frac{{{\text{Hg}}}}{{{\text{hf}}}}$$

B

H = Hg × hf

C

H = Hg + hf

D

H = Hg - hf

The static head of a centrifugal pump is equal to the _________ of suction head and delivery head.

A

Product

B

Difference

C

Sum

D

None of these

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

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