This set of Industrial Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Therbligs”.
1. Who discovered Therbligs?
a) Watson
b) Taylor
c) Gilbreth
d) Shewart
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Explanation: Gilbreth discovered therbligs. He named then after his name. It is a reverse spelling of his name. Therbligs denote the smallest elements of activity.
2. How a therblig is represented?
a) Symbol
b) Colour
c) Word
d) A symbol, a definite colour and a word to record the same
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Explanation: A therblig is represented by a symbol, a definite colour and a word to record the same. For instance, the therblig “Grasp” is denoted by “Ո”, colour ‘red’ and is used to represent the action ‘Gain control or hold on an object’.
3. Which is used to describe the fundamental hand motion of a work cycle?
a) Therblig
b) Process chart symbols
c) A small arrow
d) A small square
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Explanation: A therblig is used to denote/represent/describe the fundamental hand motion of a work cycle. It represents the small movements in a given activity and hence it is microscopic.
4. How many microscopic motions are involved in a macroscopic activity “Pick up the bolt”?
a) Two
b) Six
c) Five
d) Three
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Explanation: Microscopic motion analysis uses therbligs to define elemental activities. “Pick up the bolt” is a macroscopic motion and every macroscopic motion can be divided into several microscopic motions. “Pick up the bolt” motion involves microscopic motions such as transport empty, grasp and finally the transport loaded.
5. What 
represents in a SIMO chart?
a) Select
b) Position
c) Grasp
d) Assemble
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Explanation: “Ո” in a SIMO chart is used to represent a micro motion “Grasp” which means to gain control or hold on an object. Grasp is one of the eighteen therbligs. Its colour is red.
6. Arrange the following elemental activities as in a SIMO chart to pick some component.
(i) Grasp
(ii) Transport loaded
(iii) Transport empty
a) ii, i, iii
b) i, iii, ii
c) iii, i, ii
d) ii, iii, i
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Explanation: SIMO chart is used in the micro-motion study. It uses therbligs to represent the elemental motions. A macroscopic activity like picking some component involves microscopic activities (therbligs) like transport empty (reach), grasp and transport loaded as mentioned in the order.
7. Match the following.
p) Black i) Grasp q) Grey ii) Search r) Red iii) Find
a) p – iii, q – i, r – ii
b) p – iii, q – ii, r – i
c) p – i, q – iii, r – ii
d) p – ii, q – iii, r – i
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Explanation: Criterion for matching is therblig and its colour. Every therblig is represented by a definite colour. So, Grasp is represented by red colour. Likewise, the search is represented by black and find is represented by grey.
8. How a therblig ‘select’ is represented?
a) 
b) 
c) 
d) 
View Answer
Explanation: Therbligs are used to represent the microscopic motion in a SIMO chart. Select is a therblig that is denoted by a symbol
. Its colour is light grey.9. What a blue colour represents in a SIMO chart?
a) Position
b) Grasp
c) Transport empty
d) Find
View Answer
Explanation: A blue colour in a SIMO chart is used to represent the therblig, position. It represents the micromotion, orient an object for use at its present. It is abbreviated as ‘P’. It is symbolically represented as
.10. Which of the following symbol represents the therblig “Hold”?
a) 
b) 
c)
d)
View Answer
Explanation: Hold is a therblig that is represented by a symbol
. Its colour is gold ochre. It is abbreviated as ‘H’. It represents the micromotion, to keep an object stationary.More MCQs on Therbligs:
Sanfoundry Global Education & Learning Series – Industrial Engineering.
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