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Crane & Rigging Training Quiz

  
  
  
  

Sometimes we can sharpen our skill and knowledge level with a series of questions which cause us to draw from our experiences with cranes and rigging. Try your hand at the following questions and see how you score. Choose the BEST answer for each question below. (Answers below)

1. Before a rigger can select the length and capacity of slings needed to lift a load, what two things must he know about the load?
a. Height, manufacturer
b. Weight, center of gravity
c. Color, designated pick points

2. A fiber core wire rope has _____ breaking strength than a wire rope with an independent wire rope core.
wire ropea. the same
b. more
c. less

3. Which of the following does not affect the capacity of a wire rope sling?
a. D/d ratio
b. Sling angle
c. Thimbles in sling's eyes

crane&riggingquiz24. Which grade of chain is the only acceptable type for use in chain slings?
a. Transport G-7
b. High test G-4
c. Alloy G-8
d. Proof coil G-3

5. Using a crane scale and test lift method we discover the load's north end weighs 21,000 lbs and the south end weighs 7,000 lbs. If the load is 16 ft in length (north to south) the center-of-gravity is approximately ____ feet from the north end.
a. 2
b. 12
c. 8
d. 4

6. If a load is to be winched across a flat concrete floor, it should be placed on a skid which has ___ on its underneath side to provide the least friction.
crane&riggingquiz3a. aluminum
b. wood
c. steel
d. rubber

7. The load chain of an electric hoist ____ be wrapped around a load for lifting purposes.
a. should not
b. can
c. shall not

crane&riggingquiz48. What is the maximum line pull for a 5-ton snatch block?
a. 2.5 ton
b. 10 ton
c. 5 ton

crane&riggingquiz59. Which angle from horizontal will produce the greatest tension in a sling leg; a 60 degree angle, a 45 degree angle or a 30 degree angle?
a. 60 degrees
b. 45 degrees
c. 30 degrees

10. Which weight in pounds most closely correlates to a cubic foot of steel?
a. 165
b. 480
c. 615

11. Which of the following is not a removal criteria for a synthetic web sling?
a. Worn or broken stitching
b. Illegible or missing tag
c. Severe pliability

12. What is the hand signal to raise the boom of a mobile crane?
a. Thumb up, clenched fist
b. Index finger up
c. Two hands, thumbs pointing towards each other, clenched fists

13. A load rigged with the crane hook 4 ft south of the center of gravity will initially swing ___ upon lift-off.
a. Approximately 4 ft north
b. Approximately 4 ft south
c. Approximately 8 ft south

14. There are three conditions that must be present for a 3-leg sling bridle to have equally tensioned legs: All slings must be equidistant in length. All slings must be equidistant from each other. What is the third condition that must be met?
crane&riggingquiz6a. All slings must be fro the same manufacturer
b. All sling connection points must be equidistant to the load's center of gravity
c. All sling connection points must be on the top surface of the load

 

Happy trails to all my crane and rigging friends,

Mike Parnell
ITI-Field Services

P.S.  This article was originally published in The Professional Rigger Newsletter - Crane & Rigging Quiz.

 

 

Answers to Crane & Rigging Quiz:

crane&riggingquiz answers

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Comments

I question the answer for 13. 
 
If you are rigged south of the CoG the load is gonna shoot to the horth when raised.
Posted @ Friday, August 26, 2011 8:16 PM by chris
We tried it and the load did as the answer to the test said it would 
Posted @ Wednesday, April 03, 2013 11:57 PM by walt jones
I would just like to say i met Fernando Alves this morning in Dubai where we are both conducting training, what a gentleman he is and i do hope i have the pleasure of meeting him again
Posted @ Friday, June 14, 2013 11:04 PM by russell
That's great to hear Russell. I will pass along the message to Fernando. Thanks!
Posted @ Thursday, June 20, 2013 3:39 PM by Zack Parnell
Is there a standardized formula for calculating question #5. I got it right by using a ratio/trial and error approach but was wondering if there was a quicker way?
Posted @ Sunday, November 24, 2013 3:13 PM by Steve Wilhide
@Steve, The formula I teach my students to use is heavy side/total weight. In this case 7000/28000=75%. From the light side travel 75% = 12' or 4' from heavy side edge.
Posted @ Friday, January 10, 2014 4:57 PM by Shane
Thank you very much.
Posted @ Friday, January 10, 2014 5:09 PM by Steve
I have just realised from the above blog that i mentioned Fernando Alves, sorry Zac it wasn't Fernando, it was someone else but he gave me Fernandos card.
Posted @ Friday, January 10, 2014 9:48 PM by russell flanagan
i want formula for load calculation
Posted @ Saturday, January 18, 2014 5:45 AM by mazhar
I sure needed to practice for this test thanks I dont want to fail
Posted @ Thursday, February 27, 2014 8:56 PM by Juan Vela
i question 13 also.i take test tomorrow july 16 2014
Posted @ Tuesday, July 15, 2014 11:22 AM by richard hill
Good day 
 
I am staying in S.A Mpumalanga. I am doing my section 28 on rigger paying it on my own. I have been approved so waiting for a date to start. I would like to know if you can help assist me on the preparation and theory course that i need to know like lifting tackle/equipment some questions and answers please. Thank you very much! 
 
Regards: Kenneth
Posted @ Tuesday, July 29, 2014 1:21 AM by kenneth cilliers
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