Question 1

Originally, Rankine's theory of lateral earth pressure can be applied to only______________    
A)cohesion less soil
B)cohesive soil
C)fine grained soil
D)coarse grained soil

Accepted Answer

Rankine's theory of lateral earth pressure was originally developed for cohesionless soils, such as sands and gravels, which do not exhibit cohesive strength.

Question 2

Rankine's theory of lateral pressure was extended to other soil by______________          
A)resal and bell
B)mohr
C)none of the mentioned
D)all of the mentioned

Accepted Answer

Resal and Bell extended Rankine's theory of lateral pressure to other types of soil.

Question 3

Based on the assumptions of Rankine's theory, the soil mass is______________          
A)stratified
B)submerged
C)homogeneous
D)all of the mentioned

Accepted Answer

Rankine's theory assumes that the soil mass is homogeneous, meaning it has uniform properties throughout.

Question 4

Which of the following cases for cohesion less backfill in Rankine's theory is considered?
A)submerged backfill
B)moist backfill with no surcharge
C)backfill with sloping surface
D)all of the mentioned

Accepted Answer

Rankine's theory for cohesionless backfill considers all the mentioned cases: submerged backfill, moist backfill with no surcharge, and backfill with a sloping surface.

Question 5

The factor that is responsible for inclination of resultant pressure to the retaining wall is______________          
A)frictional force
B)surcharge
C)earth pressure
D)weight of the wall

Accepted Answer

Frictional force is responsible for the inclination of resultant pressure to the retaining wall.

Question 6

If the sand filled behind the retaining wall with saturated water with water, then the possible lateral pressure is______________          
A)lateral pressure due to submerged weight and lateral pressure due to water
B)lateral pressure due to retaining wall
C)none of the mentioned
D)all of the mentioned

Accepted Answer

The correct answer is A because when sand is saturated with water behind a retaining wall, the lateral pressure exerted on the wall consists of two components: the lateral pressure due to the submerged weight of the sand and the lateral pressure due to the water itself (hydrostatic pressure).

Question 7

The earth pressure at rest exerted on a retaining structure can be calculated using
A)theory of plasticity
B)theory of elasticity
C)mohr's theory of rupture
D)none of the mentioned

Accepted Answer

The earth pressure at rest exerted on a retaining structure can be calculated using the theory of elasticity, which considers the elastic behavior of soil under stress without yielding or failing.

Question 8

The expression for K0 as given by Jacky is
A)k0 = 1 - sin ?
B)k0 = sin ?
C)k0 = 1 - cos ?
D)k0 = 1 + sin ?

Accepted Answer

k0 = 1 - sin ?Explanation:k0 is the ratio of the wave number in the medium to the wave number in vacuum.k0 = (2π/λ) / (2π/λ0)= λ0/λ= 1/sin ?

Question 9

What will be the coefficient of earth pressure at rest for a rigid retaining wall, If the backfill consists of cohesion less soil having ? = 26°?
A)0.1295
B)0.6552
C)0.5616
D)0.7383

Accepted Answer

The coefficient of earth pressure at rest (K0) for cohesionless soil can be calculated using the formula K0 = 1 - sin(φ), where φ is the angle of internal friction. For φ = 26°, K0 = 1 - sin(26°) = 0.5616.

Question 10

A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at ? with horizontal.
A)psin?(sin?+cos?)/hl
B)p(sin?+cos?)/hl
C)pcos?(sin?+cos?)/hl
D)none of the listed

Accepted Answer

The shear stress on an inclined plane is given by resolving the force into components parallel and perpendicular to the plane. The correct expression for shear stress involves the sine of the angle for the force component parallel to the plane.

Question 11

Maximum shear stress in transverse fillet weld of leg h and length l is
A)p/hl
B)1.21p/hl
C)p/1.21hl
D)none of the listed

Accepted Answer

The maximum shear stress in a transverse fillet weld of leg h and length l is given by the formula τ = 1.21P/hl, where P is the load, h is the leg height, and l is the length of the weld. This accounts for the throat area being smaller than the actual cross-sectional area of the weld.

Question 12

Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.

Accepted Answer

Hollow saddle keys rely on friction to transmit torque and are not as effective in power transmission as flat saddle keys, which have a larger contact area and can therefore transmit more power.

Question 13

Saddle key is more suitable than sunk key for heavy duty applications.

Accepted Answer

Sunk keys are generally more suitable for heavy duty applications because they provide a positive drive by fitting into matching keyways in both the shaft and the attached member, thus handling higher torque levels more effectively than saddle keys, which rely on friction and are better suited for light loads.

Question 14

The main advantage of sunk key is that it is a______________drive.
A)positive
B)negative
C)neutral
D)none of the listed

Accepted Answer

Sunk keys are a type of key that fits into a keyway in both the shaft and the attached member, creating a positive drive due to the direct engagement and prevention of relative motion between the parts.

Question 15

Woodruff key permits______________movement b/w shaft and the hub.
A)axial
B)radial
C)eccentric
D)none of the listed

Accepted Answer

The answer of Woodruff key permits______________movement b/w shaft and the...

Question 16

Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.
A)49mm
B)36mm
C)46mm
D)53mm

Accepted Answer

The answer of Determine the length of kennedy key required...

Question 17

Splines are keys.

Accepted Answer

Splines are used to create smooth curves by interpolating a set of points. Keys are used to control the shape of the curve.

Question 18

The prestressed concrete slab systems are ideally suited for______________          
A)roofs
B)slabs
C)beam
D)column

Accepted Answer

The answer of The prestressed concrete slab systems are ideally...

Question 19

The precast prestressed hollow core slabs, with or without topping is an important
A)floor panels
B)tendons
C)wall coatings
D)reinforcements

Accepted Answer

Precast prestressed hollow core slabs are primarily used as floor panels in construction, providing an efficient and lightweight solution for creating floors in buildings.

Question 20

One way slabs may be supported across the entire width of the slab by means of
A)columns
B)piers
C)ridges
D)footings

Accepted Answer

Piers are vertical structural elements that can support slabs across their width, providing stability and load distribution.

Quiz 1: Earth Pressure Theory, Welding, and Slab Design

Originally, Rankine's theory of lateral earth pressure can be applied to only______________

Rankine's theory of lateral pressure was extended to other soil by______________

Based on the assumptions of Rankine's theory, the soil mass is______________

Which of the following cases for cohesion less backfill in Rankine's theory is considered?

The factor that is responsible for inclination of resultant pressure to the retaining wall is______________

If the sand filled behind the retaining wall with saturated water with water, then the possible lateral pressure is______________

The earth pressure at rest exerted on a retaining structure can be calculated using

The expression for K0 as given by Jacky is

What will be the coefficient of earth pressure at rest for a rigid retaining wall, If the backfill consists of cohesion less soil having ? = 26°?

A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at ? with horizontal.

Maximum shear stress in transverse fillet weld of leg h and length l is

Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.

Saddle key is more suitable than sunk key for heavy duty applications.

The main advantage of sunk key is that it is a______________drive.

Woodruff key permits______________movement b/w shaft and the hub.

Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.

Splines are keys.

The prestressed concrete slab systems are ideally suited for______________

The precast prestressed hollow core slabs, with or without topping is an important

One way slabs may be supported across the entire width of the slab by means of