1. The precast concrete piles are generally used for a maximum design load of about ____________
a) 50 tonnes
b) 100 tonnes
c) 75 tonnes
d) 80 tonnes
Explanation: The precast concrete piles are generally used for a maximum design load of about 80 tonnes, except for large pre-stressed piles
2. Cast-in-situ piles may be classified in to ________ classes.
a) Three
b) Eight
c) Two
d) Four
Explanation: Cast-in-situ piles can be classified in to two classes: driven piles(cased or uncased) and bored piles(pressure piles, pedestal piles and under reamed piles).
3. Which of the following piles is a cast-in-situ type of concrete pile?
a) Under-reamed pile
b) Raymond standard pile
c) Pressure pile
d) Anchor pile
Explanation: Raymond standard pile and Raymond step-taper pile are the common types of cast-in-situ piles
4. Composite piles are suitable for ______________
a) Maximum design load
b) Project above the water table
c) Compacting the soil
d) Protect water front structures
Explanation: Composite piles are suitable where the upper part of a file is to project above the water table. Such a pile consists of a lower portion of untreated timber and the upper portion of concrete.
5. Piles are commonly driven in to ground by means of special device called __________
a) Pile driver and Hammer
b) Driller
c) None of the mentioned
d) All of the mentioned
Explanation: Piles are commonly driven by means of hammer supported by a crane or by a special device known as pile drivers.
6. The types of hammer used for driving piles are ___________
a) Drop hammer
b) Diesel hammer
c) Vibratory hammer
d) All of the mentioned
Explanation: Hammer of the following types: i) drop hammer ii) single acting hammer iii) double acting hammer iv) diesel hammer v)vibratory hammer.
7.If a hammer is raised by steam and allowed to fall by gravity on top of the pile, it is called as________
a) Diesel hammer
b) Vibratory hammer
c) Single acting hammer
d) Drop hammer
Explanation: If a hammer is raised by steam, compressed air or internal combustion, but is allowed to fall by gravity alone, it is called as single acting hammer. The energy of such hammer is equal to the weight of the ram times the height of the fall.
8. Single acting hammers provide an advantage in __________ type of soil.
a) Compact soil and Hard soil
b) Light weight soil
c) None of the mentioned
d) All of the mentioned
Explanation: Single acting hammers are advantageous when driving heavy piles in compact or hard piles.
9. The maximum load which can be carried by a pile is defined as its __________
a) Ultimate load carrying capacity
b) Ultimate bearing resistance
c) Ultimate bearing capacity
d) All of the mentioned
Explanation: The ultimate load carrying capacity, or ultimate bearing resistance or ultimate bearing capacity Q up is defined as the maximum load which can be carried by a pile and at which the pile continues to sink without further increase of load.
10. The allowable load which the pile can carry safely is determined on the basis of ________
a) Factor of safety
b) Load test
c) Stability of the pile foundation
d) All of the mentioned
Explanation: The allowable load Qa is the safe load which the pile can carry safely and is determined on the basis of:
i) overall stability of the pile-foundation
ii) the permissible settlement
iii) ultimate bearing resistance divided by factor of safety.