Engineering Questions with Answers - Multiple Choice Questions

# MCQs on Thin Cylinder due to Longitudinal Stress on Surface of Cylinder

1 - Question

Calculate the hoop stress at the bottom of penstock, if a steel penstock of 1 m and 10 mm thick is subjected to 100m head of water. Take w = 9.81 kN/m3.
a) 49 N/mm2
b) 47 N/mm2
c) 45 N/mm2
d) 43 N/mm2

Explanation: We know that p = wh ; p = 9.81×100 = 981 kN/m2= 0.981 N/mm2.
Hoop stress = pd/2t = 0.981 ×1000/2×10 = 49 N/mm2.

2 - Question

Maximum daily demand = _____ × Average daily demand.
a) 2.5
b) 3.5
c) 1.5
d) 4

Explanation: Peak demand is a maximum consumption of water in an hour or in a day the effects of monthly variations of flow influences the design of pumps and services reservoirs.
Maximum daily demand = 1.5 × Average daily demand.

3 - Question

Which of the following is not a short term estimate in population forecast?
a) Graphical comparison
b) Geometrical increase method
c) Arithmetical increase method
d) Graphical extension method

Explanation: Graphical comparison is a long term estimate. In this estimate, the population time curve of a given community can be extrapolated on the basis of trends experienced by similar and larger communities.

4 - Question

Pn = P[1+r/100]n is a formula used in ___________
a) Arithmetical increase method
b) Incremental increase method
c) Geometrical increase method
d) Graphical extension method

Explanation: Geometrical increase method is used for young and rapidly growing cities
The formula used is Pn = P[1+r/100]n; Where Pn = population of “n” decades
r = percentage rate of increase per year
n = number of years or decades.

5 - Question

According to Freeman, estimate of fire demand can be made from the formula?
a) Q = 3175 P
b) Q = 2125 P
c) Q = 1136.5 (P/5 +10)
d) Q = 2715 (P/5 + 10)

Explanation: Fire fighting demand is provided acquisition draught on distribution system with normal supply to the consumers according to J R freeman’s formulae :
Q = 1136.5 ( P/5 + 10 )
Q = quantity of water in litres per minute
P = population in thousands.

6 - Question

Fire hydrants are located in a main at a distance of ______________
a) 200 to 250 m
b) 150 to 200 m
c) 100 to 150 m
d) 50 to 100 m

Explanation: A sufficient amount of water must therefore always be available to satisfy the peak demand and extinguish any possible fire. For effective fire protection, hydrants are located at about 150 m intervals.

7 - Question

In total consumption, losses account about __________
a) 10
b) 15
c) 30
d) 25

Explanation: In total consumption, losses account about 15 %.

 Types of consumption Percentage varies Industrial and commercial demand 25 % Public demand 15 % Losses 15 %

8 - Question

_______ is integrated or summation hydrograph.
a) Mass curve
b) Mild curve
c) Ryve’s curve
d) Dicken’s curve

Explanation: Mass curve diagram is the integrated or summation hydrograph. It shows the relation between time and cumulative discharges in a river.

9 - Question

___________ is an example of a subsurface source.
a) Streams
b) Impounding reservoir
c) Rivers
d) Springs

Explanation: When ground water appears at the surface for any reason springs are formed. The springs generally can supply small quantity of water.

10 - Question

Infiltration wells are ____________ wells constructed in series.
a) Vertical
b) Horizontal
c) Inclined

Explanation: Infiltration wells are the vertical shallow wells constructed in series along the banks of rivers. The wells are connected by Porous pipes to a sump well called “jack well”.

11 - Question

_______ are the horizontal tunnels laid along the banks of river.
a) Infiltration wells
b) infiltration reservoir
c) infiltration galleries
d) infiltration Springs

Explanation: Infiltration galleries are used as source of water supply. These are the horizontal tunnels which are constructed through water bearing strata. They are usually laid along the banks of rivers, so that water can be drawn across the line of flow.

12 - Question

Carbonic acid is high in ______ springs.
a) Gravity
b) Surface
c) Artesian
d) Erotic

Explanation: Surface springs are formed when subsoil water is exposed to the ground. The spring water which is not disturbed by the rainfall is usually attractive in appearance and of good palatability. However, the content of free carbonic acid is sometimes high and spring water may possess corrosive and plumb solvent properties.

13 - Question

In _________ springs, that trench acts as a storage reservoir.
a) Surface
b) Erotic
c) Artesian
d) Gravity

Explanation: Gravity springs are developed due to overflowing of water table. The flow from a gravity spring is variable with rise or fall of water table. In order to meet with such fluctuations, a trench may be constructed near such spring. That trench acts as a storage reservoir.

14 - Question

Which of the following wells are also known as water table well?
a) Deep wells
b) Open wells
c) Shallow wells
d) Sunk wells

Explanation: Shallow well is a well which supply from the uppermost aquifer. The flow into the wells takes place only by gravity. Due to this depression, the well is also known as gravity well or water table well.

15 - Question

Calculate the strain energy of a member bearing stress of 0.0366 N/mm2. If the length of the member is 1 m and a cross section area is 60000mm2. Take E = 2 × 105 N/mm2.
a) 0.4 Nmm
b) 0.5 Nmm
c) 0.6 Nmm
d) 0.2 Nmm