Construction Chapter 13: Aggregate Production
40 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the unit weight of the crushed stone in lb/cf?

  • 95 lb/cf
  • 120 lb/cf
  • 110 lb/cf
  • 102 lb/cf (correct)
  • What is the permissible efficiency of the screen?

  • 85%
  • 80%
  • 95%
  • 90% (correct)
  • What is the width of the screening unit in feet?

  • 4.5 ft
  • 3 ft
  • 3.5 ft (correct)
  • 4 ft
  • What is the closed setting of the jaw crusher in inches?

    <p>5 in.</p> Signup and view all the answers

    What is the size range of the crushed stone output from the jaw crusher?

    <p>5 to 4 in.</p> Signup and view all the answers

    How many decks will the horizontal vibrating screen have?

    <p>3 decks</p> Signup and view all the answers

    What is the weight of the crushed stone in lb/cf according to the second part of the text?

    <p>110 lb/cf</p> Signup and view all the answers

    What is the name of the association that provides support in operating productivity improvements, engineering research, safety and health, environmental concerns, and technical issues?

    <p>NSSGA</p> Signup and view all the answers

    What factor does not directly influence the capacity of a crusher?

    <p>Amount of explosive used in drilling</p> Signup and view all the answers

    Which process involves separating materials based on particle size ranges?

    <p>Sizing</p> Signup and view all the answers

    What equipment is used to load the stone that is to be crushed?

    <p>Shovel, excavator or loader</p> Signup and view all the answers

    What is the primary function of washing in aggregate production?

    <p>Eliminating undesirable materials</p> Signup and view all the answers

    Which component of a jaw crusher is movable?

    <p>Inclined jaw</p> Signup and view all the answers

    What is the purpose of matching the capacity of the shovel or loader to the crushing plant?

    <p>Ensure economic production</p> Signup and view all the answers

    In aggregate production, what chapter primarily discusses transport?

    <p>Chapter 9 and 10</p> Signup and view all the answers

    Which process follows after the stone is crushed and screened?

    <p>Storage and transport</p> Signup and view all the answers

    What is the recommended factor of safety for selecting a screen with calculated capacity greater than the required capacity?

    <p>10 to 25%</p> Signup and view all the answers

    What is the minimum screen size recommended for screening 120 tph of dry crushed stone?

    <p>4- by 10-ft</p> Signup and view all the answers

    What is the weight per cubic foot of the dry crushed stone being screened?

    <p>100 lb/cf</p> Signup and view all the answers

    What percentage of the aggregate is smaller than the in.in size?

    <p>30%</p> Signup and view all the answers

    What type of machine is a screw-type classifier used for?

    <p>Producing specification sand</p> Signup and view all the answers

    Where is the motor located in the single screw classifier shown in Figure 13.22?

    <p>At the discharge end</p> Signup and view all the answers

    What activates the discharge valve in sand classifiers to enable material flow into the splitter box?

    <p>A paddle</p> Signup and view all the answers

    In sand classifiers, which size sand particles settle last in the tank?

    <p>Fine</p> Signup and view all the answers

    What is the maximum output of the roll crusher in tons per hour for material less than 1 inch?

    <p>45 tons per hour</p> Signup and view all the answers

    If 12% of the stone from the quarry is smaller than 1 inch and removed before sending it to the jaw crusher, how does this affect the process?

    <p>It ensures that only larger stones are processed by the jaw crusher</p> Signup and view all the answers

    What is the correct screen efficiency to use when determining the minimum-size screen required to handle the crusher output with a permissible efficiency of 85%?

    <p>85%</p> Signup and view all the answers

    For the output of a 47- by 34-inch crusher and an opening of 3 inches, what is the minimum size screen required to handle this output?

    <p>47.1 sf</p> Signup and view all the answers

    What is the average number of fatalities per year in the mining industry?

    <p>40 to 50</p> Signup and view all the answers

    What is the permissible efficiency when using a 90% efficient vibrating screen for the output from a 40- by 30-in. jaw crusher?

    <p>90%</p> Signup and view all the answers

    Considering the 40- by 30-inch jaw crusher details, what is the unit weight of crushed stone?

    <p>106 lb/cf</p> Signup and view all the answers

    What is one of the primary causes of mining fatalities?

    <p>Entanglement with powered haulage equipment</p> Signup and view all the answers

    Why is it crucial not to remove guards, covers, or shields when the equipment is running?

    <p>It poses a safety risk</p> Signup and view all the answers

    Given a screen width of 4 feet, how should the length of the screen be chosen for integer dimensions?

    <p>Lengths should be in integer dimensions of feet</p> Signup and view all the answers

    Which administration regulates the safe operation of aggregate production plants in the U.S.?

    <p>Mine Safety and Health Administration (MSHA)</p> Signup and view all the answers

    What is the percentage requirement for the aggregate to pass through a 1.5 in. screen according to the specifications?

    <p>100%</p> Signup and view all the answers

    What should always be done before performing maintenance to prevent unexpected motion?

    <p>Establish a positive lockout of the power source</p> Signup and view all the answers

    Which document details the safety risks of removing protective covers and guards from rock processing equipment?

    <p>MSHA accident reports</p> Signup and view all the answers

    Why is it essential to wear hard hats in aggregate production facilities?

    <p>To guard against contact with overhead equipment components</p> Signup and view all the answers

    What should be done before beginning the operation of any crushing equipment or conveyor?

    <p>Sound an audible warning alarm</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser