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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Design of Machine Elements  >  Test: Screw Jack - Mechanical Engineering MCQ

Test: Screw Jack - Mechanical Engineering MCQ


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10 Questions MCQ Test Design of Machine Elements - Test: Screw Jack

Test: Screw Jack for Mechanical Engineering 2024 is part of Design of Machine Elements preparation. The Test: Screw Jack questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Screw Jack MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Screw Jack below.
Solutions of Test: Screw Jack questions in English are available as part of our Design of Machine Elements for Mechanical Engineering & Test: Screw Jack solutions in Hindi for Design of Machine Elements course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Screw Jack | 10 questions in 20 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Design of Machine Elements for Mechanical Engineering Exam | Download free PDF with solutions
Test: Screw Jack - Question 1
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How many types of jacks are there which can be used in a screw jack?

Detailed Solution for Test: Screw Jack - Question 1

Explanation: Hydraulic jack and mechanical jack.

Test: Screw Jack - Question 2
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Which of the following does not form the important part of the screw jack?

Detailed Solution for Test: Screw Jack - Question 2

Explanation: There is no specific requirement of coupling in the screw jack.

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Test: Screw Jack - Question 3
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The transverse shear stress at the root of the threads in the nut can be given by?(symbols have their usual meaning, z=number of threads in nut)

Detailed Solution for Test: Screw Jack - Question 3

Explanation: At root of threads, the area parallel to direction of force is considered which is equal to circumference x thickness x no. of threads.

Test: Screw Jack - Question 4
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 What type of friction in cup design is recommended for the set screw?
Detailed Solution for Test: Screw Jack - Question 4

Explanation: Sliding friction, the total force require to raise the load is quite large as compared to that required in rolling friction. Hence length of handle in some cases becomes extremely large and thus it is impractical to use cups with sliding friction.

Test: Screw Jack - Question 5
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A differential screw is defined as a mechanical device consisting of two screws connected in parallel.
Detailed Solution for Test: Screw Jack - Question 5

Explanation: The two screws are connected in series.

Test: Screw Jack - Question 6
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 In a differential screw, two screws are connected in series such that the resultant motion is the summation of the motion of the two screws.
Detailed Solution for Test: Screw Jack - Question 6

Explanation: The resultant motion is the difference of the individual motion of two screws.

Test: Screw Jack - Question 7
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 A compound screw consist of two screws in parallel such that the resultant motion is the summation of the individual motion of screws.
Detailed Solution for Test: Screw Jack - Question 7

Explanation: The two screws are connected in series with the resultant motion being the sum of individual motion.

Test: Screw Jack - Question 8
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What is the output from differential screws when pitch of the two screws is 12mm and 8mm? Also the nut is rotated by applying a force of 120N at a radius of 300mm and the two screws remain stationary. The torque of raising and lowering for the two screws is 5k N-mm and 2.5k N-mm where k is the effective axial weight on the screw.
Detailed Solution for Test: Screw Jack - Question 8

Explanation: 120 x 300=5k+2.5k or k=4800N. Output=k x (12-8) or output=19200N-mm.

Test: Screw Jack - Question 9
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What is the efficiency of differential screws when pitch of the two screws is 12mm and 8mm? The nut is rotated by applying a force of 120N at a radius of 300mm and the two screws remain stationary. The torque of raising and lowering for the two screws is 5k N-mm and 2.5k N-mm where k is the effective axial weight on the screw.
Detailed Solution for Test: Screw Jack - Question 9

Explanation: 120 x 300=5k+2.5k or k=4800N. Output=k x (12-8) or output=19200N-mm. Efficiency=output/2πx120x300.

Test: Screw Jack - Question 10
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 In which case is the wear more?
Detailed Solution for Test: Screw Jack - Question 10

Explanation: In recirculating ball screw, there is a lubricant film between the contacting surfaces and hence lesser wear.

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Important Questions for Screw Jack

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Screw Jack MCQs with Answers

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