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M.Tech Structural Concreting Equipment — practice questions

Explore 12 free Concreting Equipment questions in M.Tech Structural Civil Engineering. Open each question or exercise to read its content, reference answers and available explanation.

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Concreting Equipment questions and exercises with answers

Showing questions 1–12 of 12.

Mixing time is specified per drum capacity. The unit prescribes a minimum mixing time of 1 minute for mixers up to which capacity?Read the answer and worked solution →Tilting drum-type concrete mixers can satisfactorily handle aggregates up to what maximum nominal size?Read the answer and worked solution →In a cableway, the two end towers are called the head tower and the tail tower. The drive that pulls the carriage along the suspension cable is called the:Read the answer and worked solution →In a radial-travelling cableway, two backstays are required at the stationary tower whenever the angle of travel approaches or exceeds:Read the answer and worked solution →For cycle-time calculations the unit lists suggested cableway speeds. The carriage travel speed is taken as approximately:Read the answer and worked solution →Energy imparted to a batch during mixing converts to heat in the concrete. The unit estimates this mixing-energy heat at approximately:Read the answer and worked solution →Liquid nitrogen is used as an alternate cooling agent. The unit gives its boiling temperature as approximately:Read the answer and worked solution →The unit specifies that individual embedded pipe runs may range from 180 to 360 m, with a target design length of approximately:Read the answer and worked solution →In the post-cooling pumping plant, each pipe coil is supplied at a flow rate of approximately:Read the answer and worked solution →In the heat-balance equation Eq. 7.2 for ice quantity, the latent heat of fusion of ice is assumed as which value?Read the answer and worked solution →In the heat-balance equation, the specific heat of cement is generally taken between:Read the answer and worked solution →Refrigeration plant capacity for pre-cooling of mass concrete is expressed in tons of refrigeration. One ton of refrigeration is equivalent to:Read the answer and worked solution →

Worked practice questions

Mixing time is specified per drum capacity. The unit prescribes a minimum mixing time of 1 minute for mixers up to which capacity?

  1. 0.75 m³
  2. 0.25 m³
  3. 0.50 m³
  4. 0.10 m³
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Correct answer: A. 0.75 m³

1. Mixing time governs how thoroughly the ingredients are blended in a batch. 2. The unit specifies 1 minute as the minimum mixing time for mixers up to 0.75 m³ capacity. 3. For every additional 0.75 m³ or fraction thereof, mixing time is increased by 0.25 minute. 4. Some mixers use a timer that prevents discharge until the prescribed time has elapsed. 5. The smaller capacity figures are not the threshold given by the unit. _Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._

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Tilting drum-type concrete mixers can satisfactorily handle aggregates up to what maximum nominal size?

  1. Up to about 20 mm nominal size
  2. 150 to 200 mm
  3. Up to about 75 mm nominal size
  4. Up to about 40 mm nominal size
Show answer and solution

Correct answer: B. 150 to 200 mm

1. The drum-type mixer geometry tolerates large aggregates because mixing is by rolling. 2. The unit states tilting mixers can satisfactorily handle 15 to 20 cm aggregates. 3. Such large sizes are common in mass dam concrete, hence tilting mixers are favoured for dam work. 4. Non-tilting mixers, by contrast, are limited to about 75 mm aggregate. 5. Smaller size limits would not justify a tilting mixer on a large dam project. _Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._

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In a cableway, the two end towers are called the head tower and the tail tower. The drive that pulls the carriage along the suspension cable is called the:

  1. Haul drive
  2. Hoist drive
  3. Luffing drive
  4. Reeve drive
Show answer and solution

Correct answer: A. Haul drive

1. A cableway has two separate ropes serving distinct functions. 2. The haul rope is attached to the carriage and moves it along the suspension cable. 3. Its drive is therefore called the haul drive in the unit. 4. The hoist rope, by contrast, runs to the fall block and lifts or lowers the load. 5. Luffing and reeve refer to different cableway concepts. _Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._

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More Civil Engineering topics

GATE Civil — Core TopicsCementStrength of MaterialsAggregatesTesting of ConcreteWorkability of Fresh ConcreteConcrete Mix DesignSpecial Concrete