466 . What is the firing order of a four stroke I.C engine?
- A. 1-3-4-2
- B. 1-4-3-2
- C. 1-3-2-4
- D. 1-2-4-3
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বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড || সহকারী প্রকৌশলী (Civil/EEE/Mechanical) (23-02-2024) || 2024
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467 . The specific retention is least in case of
- A. Clay
- B. Sand
- C. Silt
- D. Coarse gravel
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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468 . The highest point on road surface is called
- A. crown
- B. camber
- C. gradient
- D. beam
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বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড || সহকারী প্রকৌশলী (Civil/EEE/Mechanical) (23-02-2024) || 2024
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469 . By boiling water, hardness can be removed if it is due to
- A. calcium sulphate
- B. magnesium sulphate
- C. calcium nitrate
- D. calcium bicarbonate
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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470 . Sunlight
- A. helps growth of bacterias
- B. impedes growth of algae
- C. increases dissolved oxygen content
- D. reduces turbidity.
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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471 . The critical gradient for all soils is normally
- A. 0.5
- B. 1
- C. 1.5
- D. 2.5
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বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড || সহকারী প্রকৌশলী (Civil/EEE/Mechanical) (23-02-2024) || 2024
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472 . Aeration of water is done to remove
- A. odour
- B. colour
- C. bacterias
- D. hardness
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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473 . Sewerage system is designed for
- A. maximum flow only
- B. minimum flow only
- C. average flow only
- D. maximum and minimum flow
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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474 . Dissolved oxygen in streams is
- A. maximum at noon
- B. minimum at noon
- C. maximum at midnight
- D. same throughout the day
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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475 . An instantaneous change in voltage is not possible in a/an
- A. resistor
- B. inductor
- C. capacitor
- D. current source
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বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড || সহকারী প্রকৌশলী (Civil/EEE/Mechanical) (23-02-2024) || 2024
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476 . A 4 pole generator with 16 coil has a 2-layer lap winding. The pole pitch is
- A. 8
- B. 4
- C. 16
- D. 32
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বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড || সহকারী প্রকৌশলী (Civil/EEE/Mechanical) (23-02-2024) || 2024
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477 . Surface energy per unit area of a surface is numerically equal to
- A. atmospheric pressure
- B. surface tension
- C. force of adhesion
- D. force of cohesion
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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478 . Metacentric height is given as the distance between
- A. the center of gravity of the body and the meta center
- B. the center of gravity of the body and the center of buoyancy
- C. the center of gravity of the body and the center of pressure
- D. center of buoyancy and metacenter.
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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479 . Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
- A. 9 times
- B. 1/9 times
- C. 1/3 times
- D. 3 times
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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480 . Pure iron is the structure of
- A. ferrite
- B. pearlite
- C. anstenite
- D. ferrite and cementite
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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