THEORY OF MACHINE STANDARD
MCQ ANSWERS AN QUATIONS BASED ON MECHANICAL ENGINEERING
1. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as
A.Turning pair
B.Rolling pair
C.Sliding pair
D.Spherical pair
ANS :- A. TURNING PAIR
2. Which of the following is a lower pair
A.Ball and socket
B.Piston and cylinder
C.Cam and follower (a) and (b) above
D.Belt drive.
ANS:- D. BELT DRIVE
3. If two moving elements have surface contact in motion, such pair is known asi
A.Sliding pair
B.Higher pair.
C.Surface pair
D.Lower pair
ANS;- B. HIGHER PAIR
4. The example of lower pair is
A.Shaft revolving in a bearing
B.Straight line motion mechanisms
C.Automobile steering gear
D.All of the above
ANS;- D. ALL THE ABOVE
5. Pulley in a belt drive acts as
A.Cylindrical pair
B.Turning pair
C.Rolling pair
D.Sliding pair
ANS ;-C. ROLLING PAIR
6. The example of rolling pair is
A.Bolt and nut
B.Lead screw of a lathe
C.Ball and socket joint
D.Ball bearing and roller bearing
ANS:- D. BALL BEARING AND ROLLER BEARING
7. Any point on a link connecting double slider crank chain will trace a
A.Straight line
B.Circle
C.Ellipse
D.Parabola
ANS:- C. ELLIPSE
8. Kinematic pairs are those which have two elements that
A.Have line contact
B.Have surface contact
C.Permit relative motion
D.Are held together
ANS :- C. PERMIT RELATIVE MOTION
9. A simple mechanism has
A.1 link
B.2 links
C.3 links
D.4 links
ANS:- D. 4LINKS
10. The lower pair is a
A.Open pair
B.Does not exist.
C.Sliding pair
D.Point contact pair
ANS :- B. DOES NOT EXIST
11. Automobile steering gear is an exrimple of
A.Higher pair
B.Lower pair.
C.Turning pair
D.Rotary pair
ANS ;- B. LOWER PAIR
12. In higher pair, the relative motion is
A.Purely turning
B.Combination of sliding and turning.
C.Purely rotary
D.Purely surface contact
ANS :-B. COMBINATION OF SLIDING AND TURNING
13. Which of the following has sliding motion
A.Crank
B.Connecting rod
C.Crank pin
D.Crosshead
ANS ;-D. CROSSHEAD
14. The;,example of higher pair is
A.Belt, rope and chain drives
B.Gears, cams
C.Ball and roller bearings
D.All of the above
ANS ;- D. ALL OF THE ABOVE
15. Thepurpose of a link is to
A.Transmit motion
B.Guide other links
C.Act as a support
D.All of the above
ANS :- D. ALL OF THE ABOVE
16.. A universal joint is an example of
A.Higher pair
B.Lower pair
C.Rolling pair
D.Sliding pair
ANS :- B. LOWER PAIR
17. Rectilinear motion of piston is converted into rotary by
A.Cross head
B.Slider crank
C.Connecting rod
D.Gudgeon pin
ANS ;- B. SLIDER CRANK
18. The example of spherical pair is
A.Bolt and nut
B.Lead screw of a lathe
C.Ball and socket joint
D.Ball bearing and roller bearing
ANS ;- C. BALL AND SOCKET JOINT
19. Cross head and guides form a
A.Lower pair
B.Sliding pair.
C.Turning pair
D.Rolling pair
ANS;- B. LOWER PAIR
20. A circular bar moving in a round hole is an example of
A.Incompletely constrained motion
B.Partially constrained motion
C.Completely constrained motion
D.Successfully constrained motion
ANS:- A. INCOMPLETELY CONSTRAINED MOTION
21. If some links are connected such that motion between them can take place in more than one direction, it is called
A.Incompletely constrained motion
B.Partially constrained motion
C.Completely constrained motion
D.Successfully constrained motion
ANS:- A. INCOMPLETELY CONSTRANED MOTION
22. Which of the following mechanism is obtained from lower pair
A.Gyroscope
B.All of the above.
C.Valve and valve gears
D.Generated straight line motions
ANS:- B. ALL OF THE ABOVE
23. Which of the following would constitute a link
A.Piston, piston rings and gudgeon pin
B.Piston, piston-rod and cross head.
C.Piston rod and cross head
D.Piston, crank pin and crank shaft
ANS:- B. PISTON, PISTON ROD AND CROSS HEAD
24. The Scott-Russell mechanism consists of
A.Sliding and turning pairs
B.Sliding and rotary pairs
C.Turning and rotary pairs
D.Sliding pairs only
ANS;- A.SLIDING AND TURNING PAIRS
25. Davis steering gear consists of
A.Sliding pairs
B.Turning pairs
C.Rolling pairs
D.Higher pairs
ANS:-A. SLIDING PAIRS
26. Ackermann steering gear consists of
A.Sliding pairs
B.Turning pairs
C.Rolling pairs
D.Higher pairs
ANS:- B. TURNING PAIRS
27. A completely constrained motion can be transmitted with
A.1 link with pin joints
B.2 links with pin joints
C.3 links with pin joints
D.4 links with pin joints
ANS:- D. 4LINGS WITH PIN JOINTS
28. Oldham's coupling is the
A.Second inversion of double slider crank chain
B.Third inversion of double slider crank chain
C.Second inversion of single slider crank chain
D.Third inversion of slider crank chain
ANS:- B. THIRD ENVENTION OF DOUBLE SLIDER CRANK CHAIN
29. A slider crank chain consists of following numbers of turning and sliding pairs
A.1,3
B.2,2
C.3,1
D.4,0
ANS:- C.3,1
30. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is
A.Flexible coupling
B.Universal coupling
C.Chain coupling
D.Oldham's coupling
ANS:- B. UNIVERSAL COUOLING
31. The advantage of the piston valve over D-slide valve is that in the former case
A.Wear is less
B.Power absorbed is less
C.Both wear and power absorbed are low
D.The pressure developed being high provides tight sealing
ANS;- C. BOTH WEAR AND POWER ABSORBED ARE LOW
32. Flexible coupling is used becAuse
A.It is easy to disassemble
B.It is easy to engage and disengage
C.It transmits shocks gradually
D.It prevents shock transmission and eliminates stress reversals
ANS;- D. IT PREVENTS SHOCK TRANSMISSION AND ELILINATES STRESS REVERSALS
33. The Ackermann steering mechanism is preferred to the Davis type in automobiles because
A.The former is mathematically accurate
B.The former is having turning pair
C.The former is most economical
D.The former is most rigid
ANS:- THE FORMER IS HAVING TURNING PAIR
34. Transmission of Pow4r from the engine to the rear axle of an automobile is by means of
A.Compound gears
B.Worm and wheel method
C.Hooke's joint
D.Crown gear
ANS:- C. HOOKES JOINT
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