Concrete Structures Quiz Set-1

A beam curved in plan is designed for

Increase in the moisture content in concrete

Increase in the moisture content in concrete

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

The effect of creep on modular ratio is

According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

While designing the pile as a column, the end conditions are nearly

The critical section for finding maximum bending moment for footing under masonry wall is located

In a counterfort retaining wall, the main reinforcement is provided on the
i) bottom face in front counterfort
ii) inclined face in front counterfort
iii) bottom face in back counterfort
iv) inclined face in back counterfort
The correct answer is

The main reinforcement in the toe of a T- shaped R C. retaining wall is provided on
i) top face parallel to the wall
ii) top face perpendicular to the wall
iii) bottom face parallel to the wall
iv) bottom face perpendicular to the wall
The correct answer is

In counterfort type retaining walls
i) the vertical slab is designed as a continuous slab

ii) the heel slab is designed as a continuous slab
iii) the vertical slab is designed as a cantilever
iv) the heel slab is designed as a cantilever
The correct answer is

Which of the following R.C. retaining walls is suitable for heights beyond 6m?

Due to circumferential action of the spiral in a spirally reinforced column

The diameter of ties in a column should be

The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

The minimum cover to the ties or spirals should not be less than

The minimum diameter of longitudinal bars in a column is

The limits of percentage p of the longitudinal reinforcement in a column is given by

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

When shear stress exceeds the permissible limit in a slab, then it is reduced by

The average permissible stress in bond for plain bars in tension is

A higher modular ratio shows

The slab is designed as one way if the ratio of long span to short span is

In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

Minimum thickness of load bearing RCC wall should be

Critical section for shear in case of flat slabs is at a distance of

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

Maximum distance between expansion joints in structures as per IS : 456 -1978 is

Minimum pitch of transverse reinforcement in a column is

Which of the following statements is incorrect ?

Which of the following statements is incorrect?

The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

The ratio of the diameter of reinforcing bars and the slab thickness is

For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

The minimum cover in a slab should neither be less than the diameter of bar nor less than

According to IS : 456- 1978, minimum slenderness ratio for a short column is

According to IS : 456-1978, the column or the strut is the member whose effective length is greater than

According to IS : 456-1978, the flexural strength of concrete is

Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be

If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

Diagonal tension in a beam

For a reinforced concrete section, the shape of shear stress diagram is

Examine the following statements :
i) Factor of safety for steel should be based on its yield stress,
ii) Factor of safety for steel should be based on its ultimate stress,
iii) Factor of safety for concrete should be based on its yield stress,
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are

The factor of safety for

The fineness modulus of fine aggregate is in the range of

1% of voids in a concrete mix would reduce its strength by about

Poisson's ratio for concrete

In testing of fresh concrete to check the workability, the test which is carried out with the apparatus which is shown in the figure is called as-

Select the incorrect statement

Workability of concrete is inversely proportional to

Air entrainment in the concrete increases

Modulus of rupture of concrete is a measure of

The effect of adding calcium chloride in concrete is

i) to increase shrinkage
ii) to decrease shrinkage
iii) to increase setting time
iv) to decrease setting time
The correct answer is

As compared to ordinary Portland cement, high alumina cement has

The percentage of voids in cement is approximately

Admixtures which cause early setting, and hardening of concrete are called

Increase in the moisture content in concrete

Strength of concrete increases with

In moment distribution method, the sum of distribution factors of all the members meeting at any joint is always

The principle of virtual work can be applied to elastic system by considering the virtual work of

For a two-hinged arch, if one of the supports settles down vertically, then the horizontal

Effects of shear force and axial force on plastic moment capacity of a structure are respectively to

For a two-hinged arch, if one of the supports settles down vertically, then the horizontal

Degree of kinematic indeterminacy of a pin-jointed plane frame is given by

Which of the following methods of structural analysis is a displacement method

In the displacement method of structural analysis, the basic unknowns are

The fixed support in a real beam becomes in the conjugate beam a

The width of the analogous column in the method of column analogy is

A simply supported beam deflects by 5 mm when it is subjected to a concentrated load of 10 kN at its center. What will be deflection in a 1/10 model of the beam if the model is subjected to a 1 kN load at its center?

The deformation of a spring produced by a unit load is called

For a single point load W moving on a symmetrical three hinged parabolic arch of span L, the maximum sagging moment occurs at a distance x from ends. The value of x is

Muller Breslau's principle for obtaining influence lines is applicable
i) trusses
ii) statically determinate beams and frames
iii) statically indeterminate structures, the material of which is elastic and follows Hooke's law
iv) any statically indeterminate structure
The correct answer is

Consider the following statements: Sinking of an intermediate support of a
continuous beam
1. reduces the negative moment at support.
2. increases the negative moment at support.
3. reduces the positive moment at support.
4. increases the positive moment at the center of span.
Of these statements

When a load crosses a through type Pratt truss in the direction left to right, the nature of force in any diagonal member in the left half of the span

The fixed support in a real beam becomes in the conjugate beam a

In the displacement method of structural analysis, the basic unknowns are

Which of the following methods of structural analysis is a displacement method?

Which of the following methods of structural analysis is a force method?

Effects of shear force and axial force on plastic moment capacity of a structure are respectively to

For stable structures, one of the important properties of flexibility and stiffness matrices is that the elements on the main diagonal

i) of a stiffness matrix must be positive
ii) of a stiffness matrix must be negative
iii) of a flexibility matrix must be positive
iv) of a flexibility matrix must be negative
The correct answer is

To generate the j th column of the flexibility matrix

Select the correct statement

Study the following statements.
i) The displacement method is more useful when degree of kinematic indeterminacy is greater than the degree of static indeterminacy.

ii) The displacement method is more useful when degree of kinematic indeterminacy is less than the degree of static indeterminacy.
iii) The force method is more useful when degree of static indeterminacy is greater than the degree of kinematic indeterminacy.
iv) The force method is more useful when degree of static indeterminacy is less than the degree of kinematic indeterminacy.
The correct answer is

Which of the following is not the displacement method?

When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when

When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

When a uniformly distributed load, longer than the span of the girder, moves from left to right, then the maximum bending moment at mid section of span occurs when the uniformly distributed load occupies

The maximum bending moment due to a train of wheel loads on a simply supported girder

A single rolling load of 8 kN rolls along a girder of 15 m span. The absolute maximum bending moment will be

For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust

For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust

Bending moment at any section in a conjugate beam gives in the actual beam

The Castigliano's second theorem can be used to compute deflections

While using three moments equation, a fixed end of a continuous beam is replaced by an additional span of

The three moments equation is applicable only when

In the slope deflection equations, the deformations are considered to be caused by

The deflection at any point of a perfect frame can be obtained by applying a unit load at the joint in

The degree of static indeterminacy up to which column analogy method can be used is

In column analogy method, the area of an analogous column for a fixed beam of span L and flexural rigidity EI is taken as

In moment distribution method, the sum of distribution factors of all the members meeting at any joint is always

The carryover factor in a prismatic member whose far end is fixed is

Principle of superposition is applicable when

Castigliano's first theorem is applicable

The principle of virtual work can be applied to elastic system by considering the virtual work of

If in a rigid-jointed space frame, (6m + r) < 6j, then the frame is

The number of independent displacement components at each joint of a rigid-jointed space frame is

The deflection at any point of a perfect frame can be obtained by applying a unit load at the joint in

The degree of static indeterminacy of a rigid-jointed space frame is

The degree of static indeterminacy of a pin-jointed space frame is given by .....

where m is number of unknown member forces, r is unknown reaction components and j is number of joints

The number of independent equations to be satisfied for static equilibrium in a space structure is

A rigid-jointed plane frame is stable and statically determinate if

A pin-jointed plane frame is unstable if .....

where m is number of members, r is reaction components and j is number of
joints

If in a pin-jointed plane frame (m + r) > 2j, then the frame is ...........

where m is number of members, r is reaction components and j is number of
joints

Independent displacement components at each joint of a rigid-jointed plane frame are

Degree of static indeterminacy of a rigid-jointed plane frame having 15 members, 3 reaction components and 14 joints is

A load 'W is moving from left to right support on a simply supported beam of span T. The maximum bending moment at 0.4 1 from the left support is

Muller Breslau's principle for obtaining influence lines is applicable

The number of independent equations to be satisfied for static equilibrium of a plane structure is

Principle of superposition is applicable when