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Machine Design Online Exam Quiz

Important questions about Machine Design. Machine Design MCQ questions with answers. Machine Design exam questions and answers for students and interviews.

1. The square threads are not so strong as V-threads but they offer less frictional resistance to motion than Whitworth threads.


A : Correct

B : Incorrect

C :

D :

2. The pipe joint mostly used for pipes carrying water at low pressures is


A : socket joint

B : nipple joint

C : union joint

D : spigot and socket joint

3. A column is known as a long column if the slenderness ratio is


A : 40

B : 50

C : 70

D : 100

4. The resistance to fatigue of a material is measured by


A : elastic limit

B : Young's modulus

C : ultimate tensile strength

D : endurance limit

5. The value of stress concentration factor depends upon


A : material of the part

B : geometry of the part

C : material and geometry of the part

D : none of these

6. For unequal width of butt straps, the thickness of butt straps are


A : 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside

B : 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

C : 0.75 t for both the straps on the inside and outside

D : 0.625 t for both the straps on the inside and outside

7. According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)


A : d 2 x ? x n

B : 1.875 x d 2 x ? x n

C : 2 x d 2 x ? x n

D : 3 x d 2 x ? x n

8. Which of the following statement is correct for gears?


A : The addendum is less than dedendum

B : The pitch circle diameter is equal to the product of module and number of teeth

C : The pitch circle is always greater than the base circle

D : all of the above

9. Slenderness ratio is the ratio of


A : maximum size of column to minimum size of column

B : width of column to depth of column

C : effective length of column to least radius of gyration of the column

D : effective length of column to width of column

10. Screws used for power transmission should have


A : Low efficiency

B : high efficiency

C : very fine threads

D : strong teeth

1. An open belt drive is used when


A : shafts are arranged parallel and rotate in the opposite directions

B : shafts are arranged parallel and rotate in the same directions

C : shafts are arranged at right angles and rotate in one definite direction

D : driven shaft is to be started or stopped whenever desired without interferring with the driving shaft

2. A transmission shaft includes


A : counter shaft

B : line shaft

C : over head shaft

D : all of these

3. In order to obtain the bolts of uniform strength, an axial hole is drilled through the head as far as the threaded portion such that the area of shank becomes equal to the root area of the thread.


A : True

B : False

C :

D :

4. According to Guest's theory, the failure occurs at a point in a member when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in simple tension test.


A : True

B : False

C :

D :

5. Circumferential joint in boilers is used to get the required length of a boiler.


A : True

B : False

C :

D :

6. Surface endurance limit of gear material is dependent upon its


A : elastic strength

B : yield strength

C : brinell hardness number

D : toughness

7. The load cup of a screw jack is made separate from the head of the spindle to


A : enhance the load carrying capacity of the jack

B : reduce the effort needed for lifting the working load

C : prevent the rotation of load being lifted

D : reduce the value of frictional torque

8. A crankshaft is a __________ shaft.


A : transmission

B : machine

C :

D :

10. The ball bearings are provided with a cage


A : to reduce friction

B : to facilitate slipping of balls

C : to prevent the lubricant from flowing out

D : to maintain the balls at a fixed distance apart

2. The toughness of a material __________ when it is heated.


A : increases

B : decreases

C : does not change

D :

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