Machine Design MCQs

1.What does the designation M 33 x 2 indicate for a bolt?

Metric threads totaling 33 in a 2 cm length.Metric threads having a cross-sectional diameter of 33 mm.Metric threads with an outer diameter of 33 mm and a thread pitch of 2 mm.A bolt with a nominal diameter of 33 mm and 2 threads per centimeter.None of the above options are correct.

2.By which parameter are rivets typically designated?

The combined thickness of the plates being joinedThe total length of the rivetThe measurement across the rivet headThe standard nominal diameterAll of the mentioned factors

3.Which of these methods provides a fixed and non-removable joint?

4.Given that the tearing efficiency of a riveted joint is 75%, what is the corresponding ratio of the rivet diameter to the pitch?

5.What is the principle behind the locking mechanism of a jam nut?

A smaller nut is tightened onto the main nut, which is then slightly loosened to press against the smaller nut, generating friction to lock both nuts.A partial slot is cut into the nut’s center and then compressed by tightening a screw to secure it.A nylon or hard fiber insert is embedded inside the nut, which threads tightly onto the bolt to provide a firm hold.Slots are made at the top of the nut, allowing a cotter pin to pass through the nut and bolt hole, with the pin ends bent backward to lock it.None of the listed methods apply.

6.Where are buttress threads most commonly utilized?

lathes designed for screw cuttingmechanisms that control feed movementthe spindle components of bench visesmechanical screw jackscouplings used in railway carriages

7.What is the name of a key that fits into a curved slot machined on a shaft and can pivot within it?

8.What is the name of the tapered key that fits into a keyway on the hub and lies flat against the shaft?

9.What type of threading does a turnbuckle have on its ends?

Both ends have right-hand threadsBoth ends feature left-hand threadsOne end has left-hand threads while the other end has right-hand threadsThere are no threads on the turnbuckleThreads are located only in the central part

10.What describes the mechanism of an elastic nut as a locking device?

A smaller nut is tightened atop the main nut, which is then secured by loosening to create frictional resistance.A partial slot is cut into the center of the nut and closed by tightening a screw.A nylon or hard fiber insert is embedded within the nut and deforms as the nut is turned onto the bolt, producing a firm grip.Slots are made through the top of the nut, allowing a cotter pin to pass through both the nut and bolt, with the pin ends bent backward to lock.None of the above options are correct.

11.If a bolt has left-handed threads, what type of threads will the corresponding nut have?

Right-handed threads with identical pitchLeft-handed threads matching the same pitchThreads that may be either left-handed or right-handedRight-handed threads with a finer pitchLeft-handed threads with a finer pitch

12.Which type of thread is specifically designed for applications where the load is applied in a single direction?

13.What type of thread is commonly used in a bench vice?

14.What characterizes a split nut as a locking mechanism?

A smaller nut is tightened over the main nut, and the main nut is secured by loosening, creating frictional resistance.A partial slot is made in the center of the nut, which is then tightened to close the slot using a screw.A nylon or hard fiber insert is embedded in the nut, threading tightly onto the bolt to secure it firmly.Slots are cut through the top of the nut, allowing a cotter pin to pass through both the nut and bolt, which is then bent to lock.None of the above.

15.What is the purpose of using cutting oil during the threading of a pipe?

16.Which type of thread is most appropriate for joints requiring minimal leakage?

17.Which of the following benefits does a tube offer compared to a pipe?

18.What type of weld requires the use of a backing ring inside the pipe joint?

19.What describes the locking mechanism of a castle nut?

A smaller nut is tightened over the main nut, and by loosening, the main nut is forced against the smaller one to create friction locking.A partial slot is cut into the center of the nut, which is then compressed by tightening a screw to lock it.A nylon or hard fiber insert is embedded in the nut, which threads tightly onto the bolt to secure it firmly.Slots are cut through the top of the nut, allowing a cotter pin to be inserted through the nut and a hole in the bolt; the pin is then split and bent backward to lock it in place.None of the above.