Quiznetik
Maintenance and Rehabilitation of Structures | Set 2
1. Workability reduces with time.
A. True
B. False
C. none
D. all
Correct : A. True
2. M15 concrete is used for:
A. Dams
B. Foundation
C. R.C.C
D. Mass concreting works
Correct : B. Foundation
3. Which acid is used for the acid itching?
A. 10% HCL
B. 5% HCL
C. 8% HCL
D. 20% HCL
Correct : A. 10% HCL
4. Which NDT test used a chemical attack method?
A. load test
B. ultrasonic test
C. chloride test
D. none of the above
Correct : C. chloride test
5. Which NDT test work on the principle of rebound of the elastic mass?
A. hammer test
B. ultrasonic test
C. chloride test
D. none of the above
Correct : A. hammer test
6. What is average rebound number for low quality concrete?
A. < 20
B. > 10
C. <50
D. 50
Correct : A. < 20
7. What is a frequency range for ultrasonic test?
A. 15-125 kHz
B. 15-175 kHz
C. 50-175 kHz
D. 15-100 kHz
Correct : B. 15-175 kHz
8. DTA stands for Differential Thermal Analysis.
A. true
B. false
C. none
D. all
Correct : A. true
9. What is minimum size of core sample in core sampling method?
A. 110 mm
B. 100 mm
C. 50 mm
D. 120 mm
Correct : B. 100 mm
10. Which method used for the fire damage assessment?
A. TDA
B. XRD
C. DTA
D. all
Correct : D. all
11. Which component in sea water is responsible for the erosion in concrete?
A. calcium hydroxide
B. sulfate
C. a & b both
D. none of the above
Correct : C. a & b both
12. Due to the sulfate attack calcium sulfate is generates inside the concrete.
A. true
B. false
C. none
D. all
Correct : A. true
13. What is main component of acid rain?
A. sulfuric acid
B. nitric acid
C. a & b both
D. none of the above
Correct : C. a & b both
14. What is melting point (in degree Celsius) of the lime stone?
A. 900
B. 1200
C. 800
D. 500
Correct : A. 900
15. Which factors affect the carbonation of the concrete?
A. grade
B. permeability
C. relative humidity
D. all of the above
Correct : D. all of the above
16. How much SO3 is necessary in concrete to reduce its erosion?
A. < 0.04 m
B. >0.04 m
C. 0.05 m
D. < 0.05m
Correct : A. < 0.04 m
17. Alkaline aggregate reaction is main reason for generation of K2O inside the concrete.
A. true
B. false
C. none
D. all
Correct : A. true
18. Which compound is responsible for sulfate attract inside a concrete?
A. gypsum
B. K2O
C. K3O
D. none of the above
Correct : A. gypsum
19. Which compound is responsible for efflorescence inside a concrete?
A. Ca(OH)2
B. K2O
C. K3O
D. none of the above
Correct : A. Ca(OH)2
20. Which factor does not affect the thermal conductivity of the concrete?
A. humidity
B. volume
C. density
D. temperature
Correct : B. volume
21. What is specific heat (in J/Kg C) of the concrete?
A. 840 – 1170
B. 850 – 1170
C. 840 – 1120
D. 840 – 1270
Correct : A. 840 – 1170
22. Thermal expansion in concrete means____
A. change in area with change in temperature
B. change in temperature with change in density
C. change in humidity with change in density
D. none of the above
Correct : A. change in area with change in temperature
23. What is thermal expansion (in area per temp.) of the concrete?
A. 0.002 to 0.008
B. 0.002 to 0.010
C. 0.002 to 0.006
D. 0.004 to 0.006
Correct : C. 0.002 to 0.006
24. What is main reason for thermal movement in concrete?
A. heat of hydration
B. temperature
C. fire outside a concrete
D. all of the above
Correct : D. all of the above
25. Which chemical reaction responsible for the corrosion in RCC?
A. oxidization
B. reduction
C. radiation
D. carbonization
Correct : A. oxidization
26. What is main reason for crack generation in concrete?
A. movement of humidity
B. sleep
C. difference in temperature
D. all of the above
Correct : D. all of the above
27. PMM stands for the Polymer modified mortar.
A. true
B. false
C. none
D. all
Correct : A. true
28. Which material is used for the plasticizers in concrete?
A. POP
B. calcium
C. sodium
D. ammonia
Correct : A. POP
29. Epoxy resins have_________.
A. poor mechanical strength
B. poor thermal strength
C. low tensile strength
D. none of the above
Correct : B. poor thermal strength
30. Who is responsible for the combination of the polymer particles?
A. monomer
B. nanomer
C. tetramer
D. crystal
Correct : A. monomer
31. In cathode protection method, by____________ we can reduce the corrosion in steel.
A. increasing a electrical potential
B. decreasing a electrical potential
C. zeroing a electrical potential
D. neutralizing a electrical potential
Correct : B. decreasing a electrical potential
32. Which metal is used for making a foamed concrete?
A. aluminium
B. zinc
C. a & b both
D. none of the above
Correct : C. a & b both
33. Vacuum concrete is used for_____
A. making thin section
B. more removing a extra water from the concrete
C. when water cement ration is in between 0.5 to 0.65
D. all of the above
Correct : D. all of the above
34. Which equipment is used for the grouting?
A. heater
B. compressor
C. grout pump
D. all of the above
Correct : D. all of the above
35. Which method is not use for the underpinning?
A. heating method
B. frizzing method
C. pit method
D. all of the above
Correct : A. heating method
36. Method of strengthen a weak part of the building is known as________
A. restoration
B. repair
C. retrofitting
D. maintenance
Correct : A. restoration
37. What is minimum projection of beam for earthquake protection? ( L= length of beam)
A. L/3
B. L/2
C. L
D. 2L
Correct : A. L/3
38. According to IS : 4326-1993, what is earthquake resistance of C category buildings?
A. 0.05 – 0.08
B. 0.03 – 0.08
C. 0.06 – 0.08
D. 0.06 – 0.09
Correct : C. 0.06 – 0.08
39. PVAC stand for Polyvinyl Acetate.
A. true
B. false
C. none
D. all
Correct : A. true
40. What is cement to sand ratio for the mortar used in the repair work of the brick masonry?
A. 1:3
B. 2:3
C. 1:5
D. 5:3
Correct : A. 1:3
41. Remove a hole building or part of building in control way is known as ________
A. restoration
B. demolition
C. retrofitting
D. maintenance
Correct : B. demolition
42. Which factors affect the selection of the demolition techniques?
A. size of the building
B. shape of the building
C. available time
D. all of the above
Correct : D. all of the above
43. What is minimum distance between building and road, necessary in the case of push arm technique?
A. 5m
B. 3m
C. 8m
D. 10m
Correct : B. 3m
44. When explosion is used for the demolition of the building, than this technique is known as___
A. implosion technique
B. pressure jetting
C. push arm method
D. none of the above
Correct : A. implosion technique
45. Which factor does not affect the quantity of the explosive material?
A. column size
B. column shape
C. size of demolition
D. depth of the hole
Correct : D. depth of the hole
46. Which equipment used for starting the explosion in explosive material?
A. detonators
B. starting cap
C. current switch
D. none of the above
Correct : A. detonators
47. What is main purpose of test blasting?
A. to decide effectiveness of explosion
B. to decide a quality of explosion
C. to decide a size of explosion
D. to decide a cost of explosion
Correct : A. to decide effectiveness of explosion
48. What is the direction of manual demolition?
A. top to bottom
B. left to right
C. right to left
D. any direction
Correct : A. top to bottom