Unit - 4
91. The section should be redesigned if the nominal shear stresses
a. Exceeds the given values
b. Equal
c. Zero
d. Constant
92. The maximum shear stress value for M35 and M50 is?
a. 3.8 and 6.0
b. 3.5 and 4.0
c. 3.7 and 4.6
d. 4.2 and 4.0
a. V > 1.8Vc
b. V > 1.5Vc
c. V > 2.0Vc
d. V > 3.5Vc
94. The spacing of stirrups for maximum shear stress is _
a. 0.12dt
b. 0.7dt
c. 0.10dt
d. 0.9dt
95. The term dt in the spacing equation is termed as
a. Neutral value of depth
b. Peak value of depth
c. Highest value of depth
d. Lowest value of depth
96. When v > vc condition exits, then the shear reinforcement provided includes which extra terms than actual spacing equation?
a. dt, v, vc
b. fe, dt, v, vc
c. ft, dt, v, vc
d. fy, dt, v, vc
97. The spacing provided for shear reinforcement is given as Sv = (Asv0.87fy/0.4b).
a. False
b. True
a. Not provided
b. Made equal
c. Made zero
d. Provided
99. The ultimate shear resistance for any given section, vc should be least of values vcw and vcf.
a. True
b. False
100. What should be provided if the shear force due to ultimate load is less than the shear force of the concrete?
a. Tensile reinforcement
b. Compressive reinforcement
c. Principle reinforcement
d. Shear reinforcement
101. The end block of a prestressed concrete beam has a rectangular section; a cable carrying a force of 200kn is to be anchored against the end block at the centre if the cube strength of concrete at transfer is 30n/mm2. Design the maximum permissible bearing pressure?(Abr = 10000mm2)
a. 48n/mm2
b. 44n/mm2
c. 42n/mm2
d. 24n/mm2
102. The end block of a beam has a rectangular section 100mm wide by 200mm deep, the force of cable is 200kn. Find the actual bearing pressure?
a. 20n/mm2
b. 10n/mm2
c. 30n/mm2
d. 40n/mm2
103. The effective punching area Apun is generally the contact area of
a. All of above
b. Stress device
c. Tendon device
d. Anchorage device
104. The bearing pressure on the concrete is given as 0.8fci.
a. True
b. False
105. When prestress is transferred to concrete by means of external anchorages which pressure is developed?
a. Twisting
b. Bearing
c. Torsion
d. Bent
106. In case of pre tensioned member, the computations of transmission length are influenced by?
a. Torsion
b. Flexure
c. Bond
d. Tension
107. The pre and post tensioned members with bonded tendons bond stress between
a. Steel and water
b. Steel and concrete
c. Steel and aggregates
d. Steel and plastic
108. Which type of shear reinforcement should be provided for members with thin webs?
a. Maximum shear reinforcement
b. Minimum shear reinforcement
c. Nominal shear reinforcement
d. Tensile reinforcement
109. The various codes recommend empirical relations to estimate
a. Ultimate bending resistance
b. Ultimate torsional resistance
c. Ultimate shear resistance
d. Ultimate load
110. Which type of cables are advantages in reducing the effective shear?
a. Trapezoidal
b. Longitudinal
c. Curved
d. Straight
111. The estimation of self weight is expressed as wmin/wud = KDcgβ(L/h)L/fcu(d/h)2.
a. True
b. False
112. The computation of total ultimate moment required for the design of prestressed beams, knowledge of is necessary?
a. Spans
b. Self weights
c. Loads
d. Deflection
113. The breadth of the compression face may be assumed by considering the number of girders.
a. False
b. True
114. The small span girders with straight tendons, bw is 0.85vu/fth.
a. True
b. False
115. In the case of unsymmetrical I girders the range of values of hf/d for economical designs is generally?
a. 0.15 to 0.10
b. 0.15 to 0.25
c. 0.8 to 1.0
d. 3.4 to 6.0
116. The thickness of the web is generally determined on which of the basis?
a. Shear stress
b. Shear strength
c. Principle shear
d. Tensile shear
117. The ultimate design load includes?
a. Tensile load
b. Ultimate load
c. Partial factor of safety and live load
d. Overloaded load
118. The value of numerical constant K is between
a. 6 to 7.5
b. 5 to 6
c. 5 to 6.5
d. 5.5 to 6
119. The load combination of dead and imposed has a beneficial dead load of _
a. 2.0
b. 1.0
c. 3.0
d. 2.2
120. Design cross sectional dimensions of pretensioned roof pull given that b is 0.5d?
a. 250
b. 280
c. 230
d. 270
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