Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.

রেওয়ামিলে দেনাদার ৫২,০০০ টাকা, লিখিত অনাদারি পাওনা ২,০০০ টাকা এবং অলিখিত অন্যদায়ি পাওনা ২,০০০ টাকা। যদি দেনাদারের ওপর ৫% সঞ্চিতি রাখা হয় এবং অনাদায়ি পাওনা সঞ্চিতির ক্রেডিট ব্যালেন্স ১,০০০ টাকা হয়, তাহলে চলতি বছরে অন্যনায়ি পাওনা সঞ্চিতি কত রাখতে হবে? (In trial balance, account receivable is of Tk. 52,000 recorded bad debt of Tk.2,000 and unrecorded bad debt of Tk. 2,000. What is the amount of allowance for doubtful accounts kept in current year if the allowance is 5% on accounts receivable and credit balance in allowance for doubtful accounts currently is of Tk. 1,000 )

A

২,৫০০ টাকা (Tk. 2,500)

B

১,০০০ টাকা (Tk. 1,000)

C

২,৪০০ টাকা (Tk. 2,400)

D

1,500 টাকা (Tk. 1,500)

In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

A

3-5

B

5-11

C

8-15

D

12-18

A ladder is resting against a vertical wall and its bottom is 2.5 m away from the wall. If it slips 0.8 m down the wall, then its bottom will move away from the wall by 1.4 m. What is the length of the ladder?

A

6.2 m

B

6.5 m

C

6.8 m

D

\7.5 m

L is older than M and taller than N. O is younger than P, older than N and shorter than Q. R is older than S, younger than N, shorter than S and taller than Q. S is older than L, M, O, P, Q, R and S is necessarily false?

A

O is the shortest of the group.

B

N is the second tallest of the group.

C

L is the tallest of the group.

D

Q is the third oldest of the group.

In the design of a shell and tube heat exchanger, the corrosion allowance

A

Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc

B

For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm

C

For internal cover and tube sheet is provided on both the sides

D

All of the above

Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

A

Plain carbon steel and cast iron parts are used

B

Wall thickness is > 30 mm

C

Material of construction is high alloy steel

D

Both B & C

There are five statements given below: i. karim earns more than Rahim but less than Raihan ii. Tarique earns more than Farid iii. Rahim earns more than Rariq iv. Raihan and Rarique earn equal amounts v. Farid earns the least amount which of the above statements prove that Tarique earns more money than Rafiq?

A

I, II and III

B

II, III and IV

C

III, IV and V

D

I, III and IV

A painter has painted one-third of a rectangular wall which is ten feet high. When he will paint another 75 square feet of that wall, he will have finished three-quarters of the job. What is the length (the horizontal dimension) of the wall?

A

18 feet

B

12 feet

C

10 feet

D

9 feet

A painter has painted 1/3 of a rectangular wall that is 12 feet high. When he will paint another 50 square feet of the wall he will have finished 50% of the job. What is the length of the wall?

A

25

B

50

C

15

D

20

A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is

A

0.25

B

0.50

C

0.75

D

1.0

Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.

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