SSC-Junior Engineer (Civil & Structural) Online Exam 2018 (Part-III)

Total Questions: 40

11. Shear modulus of elasticity is the ratio of ________.

Correct Answer: D. shearing stress and shearing strain

12. Standard deviation is proportional to:

Correct Answer: B. mean strength

13. The SI unit of kinematic viscosity is __________.

Correct Answer: A. unitless

14. Extra widening of pavements provided because of off-tracking is known as:

Correct Answer: C. mechanical widening

15. The lacings are subjected to resist a transverse shear of:

Correct Answer: A. 2.5% of axial force in the member

16. The effective span of a simply supported beam is _________.

Correct Answer: A. centre to centre distance between supports
Solution:Effective span of simply-supported beams: The effective span of a simply-supported beam may be taken as the smaller of the distance between the centres of bearings, or the clear distance between supports plus the effective depth.

17. The process of determining the actual cost and price of a work related to required workers and materials is called __________.

Correct Answer: A. Daily work
Solution:No explanation given in the book

18. All the specifications for highway planning and design are given by:

Correct Answer: C. IRC
Solution:IRC (Indian Road Congress) is a semi official technical body, which may be recalled as one of the main recommendation made by the Jayakar committee. India road congress works in a close collaboration with road wing of the ministry of surface transport, government of India. Road wing of the ministry of Surface Transport handles the road matters of the Central Government.

Now IRC has become an active body of national importance controlling specification, standardization, design, material used and construction of road and bridges. The focus of IRC is now shifted to the road user safety as India accounts 11 per cent of the global road crashes. IRC has decided to take a step towards environment protection by using recycled waste and by minimizing the use of natural resources.

19. Physical depreciation is due to:

Correct Answer: B. wear and tear from operation
Solution:Depreciation due to Physical Conditions:
Very often, loss in value of assets occurs due to wear and tear and continuous use of an item. Also, forces of nature, such as exposure to climatic conditions leads to loss in value of items. These are typically called depreciation due to physical conditions, which can be subdivided into following four types:

1. Depreciation due to wear and tear from operating the machines: Friction present between sliding or rotating parts of an operating machine results into wear and tear. These can be reduced to minimum by proper lubrication of moving parts of a machine.

2. Negligent maintenance: This refers to loss of value of assets due to deferred maintenance. Maintenance of machines on a periodic basis reduces depreciation.

3. Damage of equipment due to rust, heat or decay: Equipments are continuously exposed to climatic and atmospheric effects that slowly reduces their strength and serviceability. This is called depreciation due to physical decay.

4. Depreciation due to accidents: The loss in value of assets resulting from undesirable. uncontrollable and unforeseen accidents is known as depreciation due to accident.

Depreciation Due to Functional Conditions: These are also referred to as depreciation due to economic factors. They can be subdivided into two types, viz., (i) inadequacy and
(ii) obsolescence.

1. Inadequacy: With dynamic changes occurring in business scenario and an increase in scales of business operations, an existing machine/equipment may become inadequate to manufacture/service products in required qualities and quantities. This is known as depreciation due to inadequacy.

2. Obsolescence: In the recent years, technological changes are occurring on an exponential scale. Arrival of new machines/equipment with additional features may make an existing machine obsolete, although it is functioning well. This situation may force replacement of an existing machine with a new machine containing advanced features. This is known as depreciation due to obsolescence.

20. In practice, flow velocity adopted for the design of a grit chamber is:

Correct Answer: A. 0.25 to 0.3 m/sec
Solution:A grit chamber is an enlarged channel or a long basin, in which the cross-section is increased, so as-to reduce the flow velocity of sewage to such an extent that the heavy inorganic materials do settle down by gravity, and the lighter organic materials remain in suspension, and thus, go out along with the effluent of the grit basin.

The important point in the design of the grit basins is that the flow velocity should neither be too low as to cause the settling of lighter organic matter, nor should it be so high as not to cause the settlement of the entire silt and grit present in sewage.

For grit particles of 0.2 mm (d), the above formula gives critical velocity values of 0.11 to 0.25 m/sec.

This fixes the limits for optimum flow velocity for design of grit basins. In practice a flow velocity of about 0.25 to 0.3 m/sec is adopted for the design of grit basins.