#140.
A 25 mm long smooth brass pipe 300 m long drains an open 1.2 m cylindrical tank which
contains oil having density = 950 kg/m^3 and dynamic viscosity of 0.03 N.s/m^2. The pipe discharges at
an elevation of 30 m. The liquid surface of the oil is at an elevation of 36 m. Find Reynold’s number for oil.
A
96.1
B
144.8
C
112.7
D
88.4
Answer: 96.1
#141.
A 25 mm long smooth brass pipe 300 m long drains an open 1.2 m cylindrical tank which
contains oil having density = 950 kg/m^3 and dynamic viscosity of 0.03 N.s/m^2. The pipe discharges at
an elevation of 30 m. Determine the velocity of flow.
A
0.1213 m/s
B
0.1459 m/s
C
0.1488 m/s
D
0.1174 m/s
Answer: 0.1213 m/s
#142.
A 25 mm long smooth brass pipe 300 m long drains an open 1.2 m cylindrical tank which
contains oil having density = 950 kg/m^3 and dynamic viscosity of 0.03 N.s/m^2. The pipe discharges at
an elevation of 30 m. Determine the time required in hours for the oil level to drop from elevation 36 to elevation 32.5 m.
A
22.9 hrs
B
29.6 hrs
C
27.7 hrs
D
20.4 hrs
Answer: 27.7 hrs
#143.
These are the causes of minor losses EXCEPT:
A
Sudden contractio
B
Changes in water flow
C
Valves
D
Bends
Answer: Changes in water flow
#144.
An orifice has a coefficient of discharge of 0.62 and a coefficient of contraction of 0.63. Find the
coefficient of velocity for the discharge.
A
0.984
B
0.655
C
0.800
D
0.884
Answer: 0.984
#145.
This formula in pipes is most commonly used in waterworks.
A
Darcy-Weisbach
B
Manning
C
Chezy
D
Hazen-Williams
Answer: Hazen-Williams
#146.
This refers to the overflowing stream in a weir.
A
Suppressed
B
Contracted
C
Head
D
Nappe
Answer: Nappe
#147.
The head loss in 74 m of 150 mm diameter pipe is known to be 9 m when oil (s = 0.90) flows
at 0.057 m^3/s. Assume viscosity of the oil is 0.0389 Pa. Determine the Reynolds number.
A
11210
B
13170
C
15140
D
19830
Answer: 11210
#148.
The head loss in 74 m of 150 mm diameter pipe is known to be 9 m when oil (s = 0.90) flows
at 0.057 m^3/s. Assume viscosity of the oil is 0.0389 Pa. Determine the friction factor "f".
A
0.019
B
0.078
C
0.044
D
0.034
Answer: 0.034
#149.
In precipitation , these consist of tiny liquid droplets, usually with diameters between 0.1 and 0.5 mm,
with such slow settling rates that they occasionally appear to float.
A
Drizzle
B
Rain
C
Hail
D
Snow
Answer: Drizzle
#150.
These are the sections which the parameters of channel flow will give maximum discharge.
A
Normal Depth
B
Critical Flow
C
Most Efficient Section
D
Hydraulic Grade Line
Answer: Most Efficient Section
#151.
The first "S" in MWSS stands for:
A
Society
B
System
C
Sewege
D
Sewerage
Answer: Sewerage
#152.
Two pipes are connected in parallel between two reservoirs L1 = 2600 m, D1 = 1.3 m, C = 90
; L2 = 2400 m, D2 = 0.9 m, C = 100. For a difference in elevation of 3.8 m. Determine the velocity in pipe 1.
A
1.109 m/s
B
1.218 m/s
C
1.318 m/s
D
1.213 m/s
Answer: 1.109 m/s
#153.
Two pipes are connected in parallel between two reservoirs L1 = 2600 m, D1 = 1.3 m, C = 90
; L2 = 2400 m, D2 = 0.9 m, C = 100. For a difference in elevation of 3.8 m. Determine the velocity in pipe 2.
A
1.116 m/s
B
1.020 m/s
C
1.307 m/s
D
1.064 m/s
Answer: 1.020 m/s
#154.
Two pipes are connected in parallel between two reservoirs L1 = 2600 m, D1 = 1.3 m, C = 90
; L2 = 2400 m, D2 = 0.9 m, C = 100. For a difference in elevation of 3.8 m. Determine the total flow of water.
A
4.77 m/s
B
3.64 m/s
C
2.91 m/s
D
2.12 m/s
Answer: 2.12 m/s
#155.
A jet of water 250 mm in diameter impinges normally on a flat steel plate. If the
discharge is 0.491 cu m/s. Find the force exerted by the jet on the stationary plate.
A
3.64 kN
B
4.91 kN
C
2.79 kN
D
6.33 kN
Answer: 4.91 kN
#156.
A jet of water 250 mm in diameter impinges normally on a flat steel plate. If the
discharge is 0.491 cu m/s. If the flat plate is moving at 2 m/s in the same direction as that of the jet, find the force exerted by
the jet on the plate.
A
2.216 kN
B
1.977 kN
C
1.425 kN
D
3.142 kN
Answer: 3.142 kN
#157.
A jet of water 250 mm in diameter impinges normally on a flat steel plate. If the
discharge is 0.491 cu m/s. If the flat plate is moving at 4 m/s in the same direction as that of the jet, find the work done on the
plate per second.
A
7525 N.m/s
B
8419 N.m/s
C
7068 N.m/s
D
6619 N.m/s
Answer: 7068 N.m/s
#158.
A uniform soil deposit has a dry unit weight of \(15.6 kN/m^3\) and a saturated unit weight of
\(17.2 kN/m^3\). The groundwater table is at a distance of 4 m below the ground surface. Point A is at depth
of 6 m below the ground surface. Compute the effective stress at A.
A
48.45 kPa
B
51.02 kPa
C
42.39 kPa
D
54.27 kPa
Answer: 48.45 kPa
#159.
A uniform soil deposit has a dry unit weight of \(15.6 kN/m^3\) and a saturated unit weight of
\(17.2 kN/m^3\). The groundwater table is at a distance of 4 m below the ground surface. If the water table goes up by 3.5 m find the effective stress at A.