Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

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

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
Equally disappointing is the court's ________________, one-paragraph dismissal of the claim that criminal ________________ creates a chilling effect upon speech. Such proclamations are easy _______________ from the high, secure, and insulated bench of the Supreme Court. It is journalists and newspapers, fighting hundreds of _____________ cases in court, _______________ have to deal with the very real consequences.
criminal ________________ creates a chilling effect upon speech

A

defamating

B

defamation

C

defamate

D

defamations

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

Super cavitation is the use of cavitation effect to create a bubble of steam inside a liquid.

A

True

B

False

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

If the gear ratio for fuel pump is thrice that of the oxidizer pump, the shaft speed of fuel pump is ____________ the oxidizer pump.

A

half

B

twice

C

thrice

D

one-third

Cavitation could be alleviated by having a generous geodetic height for the liquid entering the pump; this is accomplished by _________ the pump or raising the reservoir.

A

Elevating

B

Lowering

C

Displacing

D

Removing

Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

A

Pressure falls below the vapour pressure

B

Pressure becomes very high

C

Temperature becomes low

D

All of the above

Which of the statements given are correct?
1. Coriolis effect is zero at the Equator.
2. Coriolis effect is more towards the Poles.
3. Coriolis effects are related to the decreasing rotational velocity with increasing latitudes.
4. Coriolis effects are related to the increasing rotational velocity with increasing latitudes.

A

1, 2 and 3

B

1 and 3 only

C

1, 2 and 4

D

2 and 5 only

Which of the following undesirable quality pertains to the undesirable use of additives?

A

To disguise the use of faulty processing and handling techniques

B

To deceive consumers and result in a substantial reduction of the nutritive value of the food

C

When the desired effect can be obtained by good manufacturing practices which are economically feasible

D

All of the mentioned

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

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