Benkelman Beam Deflection Studies MCQ

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• What would be the corrected rebound deflection if the rebound deflection obtained from BBD studies is 1.38 mm? The test was conducted at 30°C on a clayey soil having a plasticity of 10% and a moisture content of 4.5%. The annual rainfall of the area is obtained as 1450 mm.
  ক

  2.57 mm

  খ

  1.57 mm

  গ

  2.75 mm

  ঘ

  1.75 mm
• What would be the corrected rebound deflection if the rebound deflection obtained from BBD studies is 1.33 mm? The test was conducted at 35°C on sandy soil with 5% moisture content. The annual rainfall of the area is obtained as 1050 mm.
  ক

  1.50 mm

  খ

  1.56 mm

  গ

  1.48 mm

  ঘ

  1.46 mm
• The testing is to be carried out during the ______ season.
  ক

  Monsoon

  খ

  Winter

  গ

  Summer

  ঘ

  Autumn
• BBD studies were carried out on a highway pavement at a temperature of 40°C. The rebound deflection was found to be 1.41 mm. what would be the corrected rebound deflection?
  ক

  1.33 mm

  খ

  1.35 mm

  গ

  1.40 mm

  ঘ

  1.36 mm
• It is not necessary to apply a correction for temperature if the testing temperature is lower than 35°C.
  ক

  True

  খ

  False
• What is the standard temperature taken for the rebound deflection calculation?
  ক

  27°C

  খ

  30°C

  গ

  35°C

  ঘ

  25°C
• ______ deflection is obtained as the sum of mean rebound deflection and standard deviation.
  ক

  Specific

  খ

  Characteristic

  গ

  Mechanistic

  ঘ

  Definite
• The test started from an initial point is stopped after ______ for intermediate deflection measurement.
  ক

  3 m

  খ

  2.7 m

  গ

  8.7 m

  ঘ

  9 m
• When Di-Df>0.025 mm ______ correction is applied to the equation for computing rebound deflection.
  ক

  Leg

  খ

  Moisture

  গ

  Skid

  ঘ

  Temperature
• What is the equation to find the rebound deflection if the relationship between intermediate deflection reading Di and the final deflection reading Df is Di-Df<0.025 mm?
  ক

  D=0.02(Do-Df)+0.02k(Di-Df)mm

  খ

  D=0.02(Do-Df)+0.02k(Di-Df)cm

  গ

  D=0.02(Do-Df)mm

  ঘ

  D=0.02(Do-Df)cm
• Before starting the test, the pavement stretch is divided into fair, good and poor based on ______
  ক

  General condition of the pavement

  খ

  Ability to carry wheel load

  গ

  Number of cracks

  ঘ

  Existing deflections due to loading
• A loaded truck with a rear axle load of ______ is used for the deflection study.
  ক

  4880 kg

  খ

  8770 kg

  গ

  4085 kg

  ঘ

  8170 kg
• What is the length of the slender beam portion of the Benkelman beam?
  ক

  3.66 m

  খ

  2.44 m

  গ

  3.33 m

  ঘ

  2.22 m
• Which IRC code is referred to while performing the BBD studies?
  ক

  IRC 91:1887

  খ

  IRC 81:1887

  গ

  IRC 91:1997

  ঘ

  IRC 81:1997
• Benkelman beam deflection test is a type of ______
  ক

  Destructive testing for flexible pavement

  খ

  Non-destructive testing for flexible pavement

  গ

  Destructive testing for rigid pavement

  ঘ

  Non-destructive testing for rigid pavement
• What is the operating speed of Benkelman beam deflection equipment?
  ক

  50 km/hr

  খ

  32 km/hr

  গ

  Crawling

  ঘ

  Pulsating
• The Benkelman beam deflection test involves finding the ______ of the pavement.
  ক

  Recurring deflection

  খ

  Deflection

  গ

  Rebound deflection

  ঘ

  Bound deflection
• Who developed the Benkelman beam deflection studies (BBD) and in which year?
  ক

  A.C Benkelman in 1935

  খ

  C.A Benkelman in 1935

  গ

  A.C Benkelman in 1953

  ঘ

  C.A Benkelman in 1953