Engineering Questions with Answers - Multiple Choice Questions

# MCQs on Rectangular Dam Analysis

1 - Question

Calculate the self-weight of the masonry of the rectangle dam of 10 m height and 4 m wide. Consider specific weight of masonry as 20kN/m3.
a) 600 kN
b) 500 kN
c) 800 kN
d) 1000 kN

View Answer

Answer: c
Explanation: Self weight of masonry = W = Area of cross-section × 1× Specific weight of masonry.
= (10×4)×1×20 = 800 kN.

2 - Question

Water-cement ratio varies normally from ______________ to __________
a) 0.42 – 0.45
b) 0.45 – 0.48
c) 0.42 – 0.48
d) 0.45 – 0.5

View Answer

Answer: c
Explanation: The ratio to which the required amount of water is added to weight of cement to obtain desired consistency and workability of concrete mix is known as water cement ratio. It varies from 0.42 to 0.48.

3 - Question

Calculate the resultant force of dam with given self weight 800kN and water pressure be 500kN.
a) 943.4 kN
b) 956.7 kN
c) 948.6 kN
d) 939.1 KN

View Answer

Answer: a
Explanation: Resultant force (R) = (P2 + W2)1/2 = 5002 + 8002.
= (5002 + 8002)1/2
= 943.39 ~ 943.4 kN.

4 - Question

When the reservoir is empty tension occurs at ___________
a) Toe
b) Heel
c) Top width
d) Bottom width

View Answer

Answer: a
Explanation: For no tension to develop in the damn section in any condition, the eccentricity should be less than b/6. When the reservoir is empty, tension occurs at toe and compression occurs at heel.

5 - Question

What is the mix proportion for M15 grade concrete?
a) 1:1:2
b) 1:2:4
c) 1:3:6
d) 1:4:8

View Answer

Answer: b
Explanation: Mix proportion for M15 grade concrete is 1:2:4.

 Grade of concrete Mix proportionate M10 1:3:6 M15 1:2:4 M20 1:1.5:3

6 - Question

Laterite is an example of ___________ rock.
a) Siliceous
b) Argillaceous
c) Calcareous
d) Metamorphic

View Answer

Answer: b
Explanation: The Rocks having (Gneiss) aluminium or clay as the main component, such rocks are known as argillaceous rocks. Example: Slate, Laterite.

7 - Question

________ is crystalline and compact in structure.
a) Marbles
b) Granite
c) Kadapa slabs
d) Shahabad stones

View Answer

Answer: a
Explanation: Marble is a metamorphic rock and is made from limestone, this is a very costly stone. It is less durable. It is crystalline and compact in structure. So it can take a fine polish. It is not very hard.

8 - Question

As per IS, the standard dimensions for a brick is _______ (in cm).
a) 19×8×8
b) 19×9×8
c) 19×9×9
d) 19×8×9

View Answer

Answer: c
Explanation: The shape of a brick should be uniform with rectangular surface and its size should be standard with 19×9×9 cm. They should have a uniform red colour and it should be well burnt.

9 - Question

Formation of white patches on the surface on the bricks is ____________
a) Tempering
b) Porosity
c) Shrinkage
d) Efflorescence

View Answer
Answer: d
Explanation: A good brick should not contain excess alkaline soils when the bricks are exposed to the atmosphere. It should not absorb moisture. If it attracts moisture then dampness occurs and results in the formation of white patches. Hence the brick begins decaying.

10 - Question

Kiln burning involves 90% of first class bricks.
a) True
b) False

View Answer

Answer: a
Explanation: Kiln burning is a permanent structure. There is complete control on fire. It produces a large scale of manufactured bricks, it takes only 24 hours in burning the bricks and 12 days for cooling. It produces 90% of burnt bricks.

11 - Question

______ bricks can withstand up to a temperature of 1800°C.
a) Refractory
b) Fly ash
c) Clay
d) Cement

View Answer

Answer: a
Explanation: The bricks made from refractory clay are called refractory bricks. The weight of these bricks is 2 kN/m3. The standard size is 230× 65× 113 mm. These bricks can withstand up to the temperature of 1800°C.

12 - Question

According to IS, the minimum expansion joint in construction should be ________
a) 18mm to 30 mm
b) 15mm to 24mm
c) 18mm to 25mm
d) 22mm to 30mm

View Answer

Answer: c
Explanation: According to Indian standards 456- 2000, it is desirable to provide 18 mm to 25 mm thick expansion joints after every 30 to 45 m construction of length.

13 - Question

The edges formed by the intersection of plane surfaces of a brick are known as _________
a) Arises
b) Stretcher
c) Header
d) Frog

View Answer

Answer: a
Explanation: In any bond, the edges formed by the intersection of plane surfaces of a brick are termed as arises. These are straight and sharp in case of good bricks or brick tiles.

14 - Question

The depression made in the face of brick during its manufacture is _________
a) Brick tile
b) Bat
c) Frog
d) Quoin closer

View Answer

Answer: c
Explanation: The depression provided on any face of the brick during its manufacture can be termed as frog. A hand moulded bricks has one frog. A pressed brick has two frogs.

15 - Question

Calculate the eccentricity of a rectangular dam of width 4 m. Take the distance between the water face and point where resultant cuts the base as 5.25 m.
a) 2.25m
b) 3.25m
c) 4.35m
d) 5.35m

View Answer

Answer: b
Explanation: Eccentricity = e = Z – b/ 2
Where Z = 5.25 m & b = 4m ; Now, e = Z- b/2
e = 5.25 – 4/2
= 3.25m.