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Which of the following statements are correct?

1) Cranes are employable in moving and/or hosting loads.

2) With the use of dipper and stick, power shovels can be used as hoes.

3) Overdrive for higher speeds is facility often used comfortably in the working of a tractor.

4) Clam shells are less desirable than draglines if the material is water-saturated. 
1. 1 and 4 only
2. 1 and 2 only 
3. 2 and 3 only
4. 3 and 4 only 

1 Answer

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Correct Answer - Option 1 : 1 and 4 only

Statement I: True

Cranes are used to hoist and move loads from one location to another location.

There are various types of cranes used in civil engineering construction works. A crane is a piece of heavy machinery that is a tower or platform that is equipped with cables and pulleys. They are used to lift and lower materials. The most common use of cranes is in the construction industry and heavy equipment manufacturing.

The lifting capacity of the crane varies from 0.5 tonnes to 500 tonnes.

Statement II: False

Dipper and stick is the main component of power shovel to push excavate in frontal action. It cannot be used in back hoe excavator.

A backhoe also called rear actor or back actor is a type of excavating equipment, or digger, consisting of a digging bucket on the end of a two-part articulated arm. It is typically mounted on the back of a tractor or front loader, the latter forming a "backhoe loader" .The section of the arm closest to the vehicle is known as the boom, while the section that carries the bucket is known as the dipper (or dipper-stick), both terms derived from steam shovels.

Statement III: False

Overdrive (OD) is a term used to describe a mechanism that allows an automobile to cruise at sustained speed with reduced engine RPM, leading to better fuel economy, lower noise, and lower wear.

The overdrive gearbox mechanism allows the tractor to move at lower speeds leads to fuel economy, lower noise, etc.

Statement IV: True

The dragline is designed to excavate below the machine. A dragline usually does not have to go the pit or hole in order to excavate. This is very advantageous when the earth is removed from ditch, canal, or a pit containing water.

A dragline excavator is used when material must be excavated from underwater.

Clamshells are used to handle loose material such as sand, gravel, and crushed stone. They are specially designed to lift material vertically. Clamshell excavator provides the excavation and handles vertically to considerable heights/depths.

So here Statement (1) and Statement (4) are correct only. Statement (2) and statement (3) are incorrect.

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