121. A beam curved in plan is designed for
a) bending moment and shear
b) bending moment and torsion
c) shear and torsion
d) bending moment, shear and torsion
Ans: d
122. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
a) zero
b) tensile
c) compressive
d) tensile or compressive
Ans: c
123. Sinking of an intermediate support of a continuous beam
i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at centre of span
iv) increases the positive moment at centre of span The correct answer is
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Ans: b
124. The maximum value of hoop compression in a dome is given by
a) wR / 4d
b) wR/2d
c) wR/d
d) 2wR/d
where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome
Ans: b
125. In a spherical dome the hoop stress due to a concentrated load at crown is
a) compressive everywhere
b) tensile everywhere
c) partly compressive and partly tensile
d) zero
Ans:b
126. In a ring beam subjected to uniformly distributed load
i) shear force at mid span is zero
ii) shear force at mid span is maximum
iii) torsion at mid span is zero
iv) torsion at mid span is maximum The correct answer is
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Ans:a
127. In prestressed concrete
a) forces of tension and compression change but lever arm remains unchanged
b) forces of tension and compressions remain unchanged but lever arm changes with the moment
c) both forces of tension and compres-sion as well as lever arm change
d) both forces of tension and compres-sion as well as lever arm remain unchanged
Ans: b
128. The purpose of reinforcement in prestressed concrete is
a) to provide adequate bond stress
b) to resist tensile stresses
c) to impart initial compressive stress in concrete
d) all of the above
Ans: c
129. Normally prestressing wires are arranged in the
a) upper part of the beam
b) lower part of the beam
c) centre
d) anywhere
Ans: b
130. Most common method of prestressing used for factory production is
a) Long line method
b) Freyssinet system
c) Magnel-Blaton system
d) Lee-Macall system
Ans:a
131. Select the incorrect statement
a) The loss of prestress is more in pre-tensioning system than in post-tensioning system.
b) Pretensioning system has greater certainty about its durability.
c) For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system
d) none of the above
Ans:d
132. Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?
a) elastic shortening of concrete
b) shrinkage of concrete
c) creep of concrete
d) loss due to friction
Ans: a
133. Prestress loss due to friction occurs
a) only in post-tensioned beams
b) only in pretensioned beams
c) in both post-tensioned and preten-sioned beams
d) none of the above
Ans:a
133. The heat of hydration of cement can be reduced by
a) reducing the proportions of C3A and C3S
b) increasing the proportions of C3A and C3S
c) increasing the fineness of cement
d) both (a) and (c)
134. Assertion A : Rapid hardening cement is generally not used in mass concrete construction.
Reason R : The rate of heat development is low in rapid hardening cement. Select your answer based on the coding system given below
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
135. If the angularity number of an aggregate is increased, then the workability of the concrete using this aggregate will
a) increase
b) decrease
c) not change
d) none of the above
136. If W,, W2, W3 and W4 are the weights of sand in oven dry, air dry, saturated but
surface dry and moist conditions respectively, then the moisture content of sand is
a) W3 - W,
b) W4-W2
c) W4-W3
d) W3-W2
137. The ordinate of grading curve of an aggregate represents
a) cumulative percentage passing each sieve plotted on normal scale
b) cumulative percentage passing each sieve plotted on logarithmic scale
c) sieve size plotted on normal scale
d) sieve size plotted on logarithmic scale
138. Increase in fineness modulus of aggregate indicates
a) finer grading
b) coarser grading
c) gap grading
d) none of the above
139. Weight of an oven dry sand and air dry sand are 500 gm and 520 gm respectively.
If the weight of the same sand under saturated but surface dry condition is 525 gms, then the water absorption of sand is
a) 1%
b) 4%
c) 4.76%
d) 5%
140. Soundness test of cement by Le-Chatelier's apparatus gives unsoundness due to
a) free lime only
b) magnesia only
c) both free lime and magnesia
d) none of the above
Read More Questions:
Concrete Technology and Design MCQs Part1
Concrete Technology and Design MCQs Part2
Concrete Technology and Design MCQs Part3
Concrete Technology and Design MCQs Part4
Concrete Technology and Design MCQs Part5
Concrete Technology and Design MCQs Part6
Concrete Technology and Design MCQs Part7
Concrete Technology and Design MCQs Part8
a) bending moment and shear
b) bending moment and torsion
c) shear and torsion
d) bending moment, shear and torsion
Ans: d
122. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
a) zero
b) tensile
c) compressive
d) tensile or compressive
Ans: c
123. Sinking of an intermediate support of a continuous beam
i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at centre of span
iv) increases the positive moment at centre of span The correct answer is
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Ans: b
124. The maximum value of hoop compression in a dome is given by
a) wR / 4d
b) wR/2d
c) wR/d
d) 2wR/d
where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome
Ans: b
125. In a spherical dome the hoop stress due to a concentrated load at crown is
a) compressive everywhere
b) tensile everywhere
c) partly compressive and partly tensile
d) zero
Ans:b
126. In a ring beam subjected to uniformly distributed load
i) shear force at mid span is zero
ii) shear force at mid span is maximum
iii) torsion at mid span is zero
iv) torsion at mid span is maximum The correct answer is
a) (i) and (iii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Ans:a
127. In prestressed concrete
a) forces of tension and compression change but lever arm remains unchanged
b) forces of tension and compressions remain unchanged but lever arm changes with the moment
c) both forces of tension and compres-sion as well as lever arm change
d) both forces of tension and compres-sion as well as lever arm remain unchanged
Ans: b
128. The purpose of reinforcement in prestressed concrete is
a) to provide adequate bond stress
b) to resist tensile stresses
c) to impart initial compressive stress in concrete
d) all of the above
Ans: c
129. Normally prestressing wires are arranged in the
a) upper part of the beam
b) lower part of the beam
c) centre
d) anywhere
Ans: b
130. Most common method of prestressing used for factory production is
a) Long line method
b) Freyssinet system
c) Magnel-Blaton system
d) Lee-Macall system
Ans:a
131. Select the incorrect statement
a) The loss of prestress is more in pre-tensioning system than in post-tensioning system.
b) Pretensioning system has greater certainty about its durability.
c) For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system
d) none of the above
Ans:d
132. Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?
a) elastic shortening of concrete
b) shrinkage of concrete
c) creep of concrete
d) loss due to friction
Ans: a
133. Prestress loss due to friction occurs
a) only in post-tensioned beams
b) only in pretensioned beams
c) in both post-tensioned and preten-sioned beams
d) none of the above
Ans:a
133. The heat of hydration of cement can be reduced by
a) reducing the proportions of C3A and C3S
b) increasing the proportions of C3A and C3S
c) increasing the fineness of cement
d) both (a) and (c)
134. Assertion A : Rapid hardening cement is generally not used in mass concrete construction.
Reason R : The rate of heat development is low in rapid hardening cement. Select your answer based on the coding system given below
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
135. If the angularity number of an aggregate is increased, then the workability of the concrete using this aggregate will
a) increase
b) decrease
c) not change
d) none of the above
136. If W,, W2, W3 and W4 are the weights of sand in oven dry, air dry, saturated but
surface dry and moist conditions respectively, then the moisture content of sand is
a) W3 - W,
b) W4-W2
c) W4-W3
d) W3-W2
137. The ordinate of grading curve of an aggregate represents
a) cumulative percentage passing each sieve plotted on normal scale
b) cumulative percentage passing each sieve plotted on logarithmic scale
c) sieve size plotted on normal scale
d) sieve size plotted on logarithmic scale
138. Increase in fineness modulus of aggregate indicates
a) finer grading
b) coarser grading
c) gap grading
d) none of the above
139. Weight of an oven dry sand and air dry sand are 500 gm and 520 gm respectively.
If the weight of the same sand under saturated but surface dry condition is 525 gms, then the water absorption of sand is
a) 1%
b) 4%
c) 4.76%
d) 5%
140. Soundness test of cement by Le-Chatelier's apparatus gives unsoundness due to
a) free lime only
b) magnesia only
c) both free lime and magnesia
d) none of the above
Read More Questions:
Concrete Technology and Design MCQs Part1
Concrete Technology and Design MCQs Part2
Concrete Technology and Design MCQs Part3
Concrete Technology and Design MCQs Part4
Concrete Technology and Design MCQs Part5
Concrete Technology and Design MCQs Part6
Concrete Technology and Design MCQs Part7
Concrete Technology and Design MCQs Part8
No comments:
Post a Comment