58.

59.

60.

61.

62.

63.

64.

65.

Which of the following represents a plain sedimentation unit with longer detention period?
(^) Primary sedimentation unit (B) Detritus tank
(C) Septic tank ൯൩) Humustank

The process of washing of sludge to remove excess salt during sludge treatment is
(^) Elutriation (B) Conditioning
(C) Sloughening ൯) Desalination

For successful results, the UASB reactor must operate under
(^) Thermophillic conditions ൯) Mesophilic conditions

(0 Psychrophillic conditions (D) Ambient temperature conditions

The limiting value of the depth of neutral axis (Xumax/d) for Fe 415 grade steel bars as per
5 456-2000 is

(ಯ) 0.53 (B) 0.48

(C) 0.51 (D) 0.46

The maximum shear stress of M30 concrete permitted in N/mm? (limit state method) as per
5 456-2000 is

(A) 2 (B) 2.5

(0) 3 0) 3.5

Basic Value of span to effective depth ratio for span up to 10 m of a simple supported beam as
per IS 456-2000
(A) (0)

7 0
© 24 (0)

2
26

The maximum area of steel in mm? has to be provided in a column of size 200 mm > 700 mm
is

(A) 8400 (B) 2800

(C) 4200 (D) 11200

For Nominal mix concrete, what is the quantity water (liters) used for a bag of cement as per
IS 456-2000, if the Grade of concrete is M10

(A) 45 (B) 34
(C) 28 (D) 25

13 085/2022
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