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WorksheetsDay 109-Jan 19-worksheet-Diploma-Shallow foundations
Total questions: 15
Worksheet time: 8mins
A foundation is classified as shallow when its depth is:
Greater than its width
Equal to twice its width
Less than or equal to its width
Independent of its width
Which footing is provided when columns are so closely spaced that their individual footings overlap?
Isolated footing
Strap footing
Strip footing
Grillage footing
A combined footing carrying unequal column loads is generally designed in which shape?
Square
Rectangular
Trapezoidal
Circular
Which statement about strap footing is correct?
Strap beam transfers pressure directly to soil
Strap beam remains in contact with soil
Strap beam transfers load from outer column to inner column
Strap footing is used for soft clay only
Grillage foundation is preferred when:
Load is light and soil is strong
Load is heavy and foundation depth is restricted
Water table is very high
Construction is on black cotton soil only
The net pressure intensity of a floating foundation is:
Maximum
Equal to bearing capacity
Zero
Unequal
In inverted arch foundation, the rise of arch is usually kept between:
1/2 to 1/6 of span
1/10 to 1/12 of span
1/12 to 1/15 of span
1/5 to 1/10 of span
Assertion (A): Trapezoidal combined footings are used when column loads are unequal. Reason (R): Trapezoidal shape helps in maintaining uniform soil pressure.
Both A and R are true and R is the correct explanation
Both A and R are true but R is not the correct explanation
A is true but R is false
A is false but R is true
The footing provided under each column separately is known as (a) footing.
A combined footing may be rectangular when columns carry (a) loads.
Strap footing consists of a (a) beam connecting two footings.
Minimum clearance between grillage beams should be (a) cm.
Raft foundation is suitable when bearing capacity of soil is (a) .
Gross pressure intensity includes weight of superstructure, footing and (a) if any.
In black cotton soil, cracks may extend up to a depth of 2.5 to 4 m.
True
False
