MASS Test Assembling Objects Questions and Answers 1 — Questions and Answers
Question 1: An assembly drawing shows a bolt, a nut, and two washers being used to join two steel plates. What is the primary function of the washers in this assembly?
- To prevent the nut from loosening due to vibration.
- To distribute the load of the bolt and nut over a wider surface area. (Correct answer)
- To act as a spacer to ensure the bolt is the correct length.
- To permanently lock the bolt and nut together.
Correct answer: To distribute the load of the bolt and nut over a wider surface area.
Washers are primarily used to distribute the pressure of the nut and bolt head evenly over the part being secured. This distribution of load helps to prevent damage to the surface of the steel plates and reduces the chance of the fastener loosening over time.
Question 2: A technician is assembling a machine and encounters a fastener that is a threaded rod with no head on either end. This component is designed to be screwed into a fixed part at both ends. Which of the following fasteners is being described?
- A carriage bolt
- A machine screw
- A rivet
- A stud (Correct answer)
Correct answer: A stud
A stud is a type of fastener that is essentially a rod threaded on both ends and has no head. It is used to join two components that both have internal threads.
Question 3: In a mechanical assembly, which of the following is considered a permanent fastener, meaning it cannot be removed without being destroyed?
- A hex bolt with a lock nut
- A wood screw
- A pop rivet (Correct answer)
- A cotter pin
Correct answer: A pop rivet
A pop rivet is a type of permanent fastener. Once installed, it is not designed to be removed and reused. Removing a rivet typically involves drilling or cutting it, which destroys the rivet.
Question 4: When looking at an exploded view assembly drawing, what is the main purpose of this type of illustration?
- To provide the exact final dimensions of the assembled object.
- To show the sequence and method of how parts fit together. (Correct answer)
- To list the raw materials required for each component.
- To indicate the torque specifications for all fasteners.
Correct answer: To show the sequence and method of how parts fit together.
An exploded view drawing shows the components of an assembly separated but in the correct position and orientation relative to each other. Its primary purpose is to illustrate the assembly sequence and show how all the parts fit together.
Question 5: A mechanic is using a wheel and axle system to lift a heavy object. The wheel has a radius of 12 inches, and the axle has a radius of 2 inches. What is the Ideal Mechanical Advantage (IMA) of this system?
- 2
- 6 (Correct answer)
- 10
- 24
Correct answer: 6
The Ideal Mechanical Advantage (IMA) of a wheel and axle is calculated by dividing the radius of the wheel by the radius of the axle. In this case, IMA = 12 inches / 2 inches = 6.
Question 6: Which of the following fasteners is specifically designed with a smooth, rounded head and a square neck underneath to prevent it from turning when the nut is tightened?
- Socket head cap screw
- Eye bolt
- Carriage bolt (Correct answer)
- U-bolt
Correct answer: Carriage bolt
A carriage bolt is characterized by its smooth, domed head and a square section underneath the head. This square neck is designed to fit into a square hole or to grip into wood, which prevents the bolt from spinning as the nut is tightened.
MASS Test Assembling Objects Questions and Answers 1
An assembly drawing shows a bolt, a nut, and two washers being used to join two steel plates.
What is the primary function of the washers in this assembly?