The loss of stress due to friction is given as:

1-(‚âà√≠¬¨‚à´‚âà√≠¬¨¬±+Kx)

20 + Mcqs in Loss Due Friction in Prestressed Concrete Structures Page 1 McqOptions

1.	A cylindrical concrete tank, 40m external diameter is to be prestressed circumferentially by means of a high strength steel wire (Es = 210kn/mm2) jacked at 4 points and 90 degrees apart. Find the expected extension at the jack?
A.	150mm
B.	130mm
C.	144mm
D.	133mm
Answer» D. 133mm

Discussion

2.	A concrete tank if has a minimum stress in wires 600n/mm2 immediately after tensioning and the coefficient of friction is 0.5. Calculate the maximum stress to be applied to the wires at the jack?
A.	900n/mm2
B.	960n/mm2
C.	850n/mm2
D.	800n/mm2
Answer» C. 850n/mm2

Discussion

3.	A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm2 is available in the un jacked end immediately after the anchoring. Find the angle between tangents to the cable at supports?
A.	0.13
B.	0.12
C.	0.10
D.	0.23
Answer» C. 0.10

Discussion

4.	The value of ‘μ’ in loss of stress equation depends upon ____________
A.	Type of curing
B.	Type of concrete
C.	Type of steel
D.	Type of aggregates
Answer» D. Type of aggregates

Discussion

5.	The loss of stress due to friction is given as ____________
A.	1-(μα+Kx)
B.	1-(μα+Kx)
C.	1-(μα+Kx)
D.	1-(μα+Kx)
Answer» B. 1-(μα+Kx)

Discussion

6.	The wobble effect is the result of ____________
A.	Misalignment
B.	Extreme alignment
C.	Tensile alignment
D.	Anchorage alignment
Answer» B. Extreme alignment

Discussion

7.	The wobble effect due to loss of stress is also known as ____________
A.	Wave effect
B.	Ray effect
C.	Bubble effect
D.	Bulb effect
Answer» B. Ray effect

Discussion

8.	The loss of stress due to curvature effect depends upon ____________
A.	Alignment
B.	Midpoint
C.	Centerline
D.	Exterior point
Answer» B. Midpoint

Discussion

9.	The total loss of prestress due to friction is of ____________
A.	4 types
B.	2 types
C.	8 types
D.	3 types
Answer» C. 8 types

Discussion

10.	The loss of prestress due to friction generally occurs in case of ____________
A.	Post tensioned members
B.	Pre tensioned members
C.	Chemical members
D.	Electrical members
Answer» B. Pre tensioned members

Discussion

11.	A_CONCRETE_TANK_IF_HAS_A_MINIMUM_STRESS_IN_WIRES_600N/MM²_IMMEDIATELY_AFTER_TENSIONING_AND_THE_COEFFICIENT_OF_FRICTION_IS_0.5._CALCULATE_THE_MAXIMUM_STRESS_TO_BE_APPLIED_TO_THE_WIRES_AT_THE_JACK??$
A.	900n/mm<sup>2</sup>
B.	960n/mm<sup>2</sup>
C.	850n/mm<sup>2</sup>
D.	800n/mm<sup>2</sup>
Answer» C. 850n/mm<sup>2</sup>

Discussion

12.	A_cylindrical_concrete_tank,_40m_external_diameter_is_to_be_prestressed_circumferentially_by_means_of_a_high_strength_steel_wire_(E_s_=_210kn/mm²)_jacked_at_4_points_and_90_degrees_apart._Find_the_expected_extension_at_the_jack?$
A.	150mm
B.	130mm
C.	144mm
D.	133mm
Answer» D. 133mm

Discussion

13.	A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm² is available in the un jacked end immediately after the anchoring. Find the angle between tangents to the cable at supports?
A.	0.13
B.	0.12
C.	0.10
D.	0.23
Answer» C. 0.10

Discussion

14.	The value of ‚Äö√Ñ√∂‚àö√ë‚àö‚â§‚âà√≠¬¨‚à´‚Äö√Ñ√∂‚àö√ë‚àö¬• in loss of stress equation depends upon:$
A.	Type of curing
B.	Type of concrete
C.	Type of steel
D.	Type of aggregates
Answer» D. Type of aggregates

Discussion

15.	The loss of stress due to friction is given as:
A.	1-(‚âà√≠¬¨‚à´‚âà√≠¬¨¬±+Kx)
B.	1-(‚âà√≠¬¨‚à´‚âà√≠¬¨¬±+Kx)
C.	1-(‚âà√≠¬¨‚à´‚âà√≠¬¨¬±+Kx)
D.	1-(‚âà√≠¬¨‚à´‚âà√≠¬¨¬±+Kx)
Answer» B. 1-(‚âà√≠¬¨‚à´‚âà√≠¬¨¬±+Kx)

Discussion

16.	The wobble effect is the result of:
A.	Misalignment
B.	Extreme alignment
C.	Tensile alignment
D.	Anchorage alignment
Answer» B. Extreme alignment

Discussion

17.	The wobble effect due to loss of stress is also known as:
A.	Wave effect
B.	Ray effect
C.	Bubble effect
D.	Bulb effect
Answer» B. Ray effect

Discussion

18.	The loss of stress due to curvature effect depends upon:
A.	Alignment
B.	Midpoint
C.	Centerline
D.	Exterior point
Answer» B. Midpoint

Discussion

19.	The total loss of prestress due to friction is of:
A.	4 types
B.	2 types
C.	8 types
D.	3 types
Answer» C. 8 types

Discussion

20.	The loss of prestress due to friction generally occurs in case of:
A.	Post tensioned members
B.	Pre tensioned members
C.	Chemical members
D.	Electrical members
Answer» B. Pre tensioned members

Discussion

Explore topic-wise MCQs in Prestressed Concrete Structures.

A cylindrical concrete tank, 40m external diameter is to be prestressed circumferentially by means of a high strength steel wire (Es = 210kn/mm2) jacked at 4 points and 90 degrees apart. Find the expected extension at the jack?

A concrete tank if has a minimum stress in wires 600n/mm2 immediately after tensioning and the coefficient of friction is 0.5. Calculate the maximum stress to be applied to the wires at the jack?

A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm2 is available in the un jacked end immediately after the anchoring. Find the angle between tangents to the cable at supports?

The value of ‘μ’ in loss of stress equation depends upon ____________

The loss of stress due to friction is given as ____________

The wobble effect is the result of ____________

The wobble effect due to loss of stress is also known as ____________

The loss of stress due to curvature effect depends upon ____________

The total loss of prestress due to friction is of ____________

The loss of prestress due to friction generally occurs in case of ____________

A_CONCRETE_TANK_IF_HAS_A_MINIMUM_STRESS_IN_WIRES_600N/MM2_IMMEDIATELY_AFTER_TENSIONING_AND_THE_COEFFICIENT_OF_FRICTION_IS_0.5._CALCULATE_THE_MAXIMUM_STRESS_TO_BE_APPLIED_TO_THE_WIRES_AT_THE_JACK??$

A_cylindrical_concrete_tank,_40m_external_diameter_is_to_be_prestressed_circumferentially_by_means_of_a_high_strength_steel_wire_(Es_=_210kn/mm2)_jacked_at_4_points_and_90_degrees_apart._Find_the_expected_extension_at_the_jack?$

A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm2 is available in the un jacked end immediately after the anchoring. Find the angle between tangents to the cable at supports?

The value of ‚Äö√Ñ√∂‚àö√ë‚àö‚â§‚âà√≠¬¨‚à´‚Äö√Ñ√∂‚àö√ë‚àö¬• in loss of stress equation depends upon:$

The loss of stress due to friction is given as:

The wobble effect is the result of:

The wobble effect due to loss of stress is also known as:

The loss of stress due to curvature effect depends upon:

The total loss of prestress due to friction is of:

The loss of prestress due to friction generally occurs in case of:

A_CONCRETE_TANK_IF_HAS_A_MINIMUM_STRESS_IN_WIRES_600N/MM²_IMMEDIATELY_AFTER_TENSIONING_AND_THE_COEFFICIENT_OF_FRICTION_IS_0.5._CALCULATE_THE_MAXIMUM_STRESS_TO_BE_APPLIED_TO_THE_WIRES_AT_THE_JACK??$

A_cylindrical_concrete_tank,_40m_external_diameter_is_to_be_prestressed_circumferentially_by_means_of_a_high_strength_steel_wire_(E_s_=_210kn/mm²)_jacked_at_4_points_and_90_degrees_apart._Find_the_expected_extension_at_the_jack?$

A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm² is available in the un jacked end immediately after the anchoring. Find the angle between tangents to the cable at supports?