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Why are square threaded screws are used in the machines? Explanation: The square threaded screws are used in the machines. As these screws are generally used as the fasteners. The main thing about these screws is that the friction helps the holding of the structures.
Which of the following screw thread is stronger than other threads Mcq?
4. Which of the following screw thread is stronger than other threads? Explanation: Buttress thread is stronger than other threads because of greater thickness at the base of the thread. The buttress thread has limited use for power transmission.
Which threads are highly recommended for fastening as well as power transmission purpose?
V threads are highly recommended for fastening as well as power transmission purpose. Explanation: In fastening, high frictional force is required and hence V threads are used whereas in power transmission, reduction in frictional forces is required.
When the axis of screw is vertical if the thread slope upward from left to right it is?
When the axis of screw is vertical, if the thread slopes upward from left to right. it is known as right hand thread; whereas if the thread slopes upward from right to left, it is known as left hand thread. 8.
How many types of jacks are there which can be used in a screw jack?
There are 3 main types of screw jacks: machine/worm gear screw jacks, ball screw jacks, and bevel gear jacks. Within these, there are 3 subcategories related to the mode of operation: Translating, Keyed, and Rotating/Traveling nut. The advantages and disadvantages of each type are given below.
Mechanical Engineering: Ch 11: Friction (25 of 47) Square Threated Screws: General Concepts 1
41 related questions found
Which gear is used in screw jack?
A screw jack is a gearbox assembly (either worm gear or bevel gear) and a transmission product (lead screw, ball screw or roller screw) which through use of a motor is used to convert rotary into linear motion.
Which type of thread is used for power screws?
This thread form can also be used for power screws but they can transmit power only in one direction. Typical applications are screw jack, vices etc.
Why does square thread is used in vices?
The greatest advantage of square threads is that they have a much higher intrinsic efficiency than trapezoidal threads (Acme or metric trapezoidal). Due to the lack of a thread angle there is no radial pressure, or bursting pressure, on the nut. This also increases the nut life.
What is the purpose of screw thread?
A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread.
Is the slight improvement over square thread?
Explanation: An acme thread is a slight improvement over square thread.
Which type of the screws are used in the machines for power transmission Mcq?
Explanation: Power screw converts the motion from rotary to linear and is used for power transmission.
Which of the following screw thread is used for transmitting power in either direction?
Acme thread is adopted for power transmission in either direction.
Why do Bolts have different threads?
Bolts with coarse threads have a larger pitch (fewer threads per axial distance) compared to fine threads. A coarse threaded bolt is specified for most applications unless there is an overriding reason to use a fine threaded bolt (e.g. thorough thread adjustment is crucial for the application).
Which thread has a combined strength of square thread and with thread?
1.3 Buttress Thread This thread is a combination of V-and square threads. It exhibits the advantages of square thread, like the ability to transmit power and low frictional resistance, with the strength of the V-thread.
Which type of thread is typically used in vices to transmit power only in one direction?
Buttress thread is used for transmitting power in one direction only and a common application of this thread can be found in workshop vices.
Where are Buttress thread used?
Therefore buttress threads are commonly used as: Screws for friction screw presses. Lifting screws for heavy lifting equipment. Lead screws or power screws in machines with high loads.
What are the machine screws?
Machine screws are uniformly threaded screws of ¼ inch nominal diameter or less that are designed to be threaded into uniformly threaded nuts or threaded holes in the parts they are intended to fasten. Machine screws are available in a wide array of configurations, materials, driver head types and sizes.
How are threads used in engineering?
The threads are used as fasteners, for adjustment, and to transmit power or motion. Junior engineers and the marine engineers in general must be able to recognize a nut or a bolt just by viewing it.
What is the name of screw thread which is formed on a cone Mcq?
1. What is the name of screw thread which is formed on a cone? Explanation: A screw thread is formed by forming a continuous helical groove on the external or internal surface of cylinder. The screw thread formed on frustum of a cone or a cone is called as tapered screw thread.
Why are square threads preferable to V threads for power transmission?
Square threads are preferred over V-thread for power transmission because of following points. 1) Square thread has the greatest efficiency as its profile angle is zero. 2) It produces minimum bursting pressure on the nut. 3) It has more transmission efficiency due to less friction.
Which of the following is application of square thread?
A square thread is adapted for the transmission of power in either direction. This thread results in maximum efficiency and minimum radial or bursting pressure on the nut. It is difficult to cut with tap and dies. It is usually cut on a lathe with a single point tool and it cannot be easily compensated for wear.
Which thread is used in lead screw of lathe machine?
Explanation: Acme threads are used in lathe lead screws. This form of thread enables the easy engagement of the half nut. The metric acme thread has an included angle of 30°.
Is standard for square thread?
4.1 A square thread shall be designated by the letter SQ followed by nominal diameter and pitch, the two being separated by the sign ‘X’ and the number of this standard. Example : A square thread of nominal diameter 30 mm and pitch 6 mm shall be designated as: SQ 30 x 6 – IS: 4694.7. … 1) All dimensions in millimetres.