MCQ on Basics of kinematics of machinery

MCQ on Theory of Machines

1. Match the items in columns I and II                                                                   [GATE-2006]

Column I                                                         Column II

P. Higher kinematic pair                                       1. Grubler's equation

Q. Lower kinematic pair                                       2. Line contact

R. Quick return mechanism                                  3 . Euler's equation

 S. Mobility of a linkage                                       4. Planer

                                                                              5. Shaper

                  6. Surface contact

 

(a) P-2, Q-6, R-4, S-3              (b) P-6, Q-2, R-4, S-1

(c) P-6, Q-2, R-5, S-3              (d) P-2, Q-6, R-5, S-1

 

2. The minimum number of links in a single degree-of-freedom planar

mechanism with both higher and lower kinematic pairs is                                   [GATE-2002]

(a) 2                 (b) 3                (c) 4                 (d) 5

 

3. The number degrees of freedom of a planar linkage with 8 links and 9

simple revolute joints is                                                                       [GATE-2005]

(a)1                  (b) 2                 (c) 3                 (d)4

 

4. When a cylinder is located in a Vee-block, then number of degrees of

freedom which are arrested is                                                             [GATE-2003]

(a) 2                 (b) 4                 (c) 7                 (d) 8

 

5. The number of degrees of freedom of a five link plane mechanism with five

revolute pairs as shown in the figure is                                               [GATE-1993]

 (a) 3                 (b)4                  (c)2                  (d) 1 

 

6. Match the following with respect to spatial mechanisms. [GATE-2004]

Type of Joint                           Degrees of constraint

 

P. Revolute                             1. Three

Q. Cylindrical                         2. Five

R. Spherical                             3. Four

                                                            4. Two

                                                            5. Zero

 

 (a) P-1 Q-3 R-3          (b) P-5 Q-4 R-3           (c) P-2 Q-3 R-1           (d) P-4 Q-5 R-3

 

7. A planar mechanism has 8 links and 10 rotary joints. The number of

degrees of freedom of the mechanism, using Grubler's criterion, is      [GATE-2008]

(a) 0                 (b) 1                (c) 2                 (d) 3

 

8. Match the approaches given below to perform stated kinematics/dynamics

analysis of machine.                                                                [GATE -2009]

Analysis                                                     Approach

P. Continuous relative rotation                       1. D’Alembert’s principle

Q. Velocity and acceleration                           2. Grubler’s criterion

R. Mobility                                                      3. Grashoff’s law                                                       

S. Dynamic-static analysis                              4. Kennedy’s theoram                                   

(a) P-1, Q-2, R-3, S-4               (b) P-3, Q-4, R-2, S-1                                                       

(c)  P-2, Q-3, R-4, S-1                          (d) P-4, Q-2, R-1, S-3

 

9. Which of the following statements is incorrect                  [GATE-2010]

(a) Grashof's rule states that for a planar crank-rocker four bar mechanism, the

sum of the shortest and longest link lengths cannot be less than the sum of the

remaining two link lengths.

(b) Inversions of a mechanism are created-by fixing different links one at a time.

(c) Geneva mechanism is an intermittent motion device.

(d) Gruebler's criterion assumes mobility of a planar mechanism to be one.

 

10. In a four-bar linkage, S denotes the shortest link length, L is the longest

link length, P and Q are the lengths of other two links. At least one of the

three moving links will rotate by 360o if                                            [GATE-2006]

(a) S + L ≤ P + Q       (b) S + L > P + Q       (c) S + P≤L + Q          (d) S + P > L + Q

 

11. The number of inversions for a slider crank mechanism is [GATE-2006]

(a) 6                 (b) 5                 (c) 4                 (d) 3

 

 

12. The mechanism used in a shaping machine is                   [GATE-2003]

(a) A closed 4-bar chain having 4 revolute pairs

(b) A closed 6-bar chain having 6 revolute pairs

(c) A closed 4-bar chain having 2 revolute and 2 sliding pairs

(d) An inversion of the single slider-crank chain

 

13. A simple quick return mechanism is shown in the figure. The forward to return ratio of the quick return mechanism is 2:1. If the radius of the crank O₁P is 125 mm, then the distance ‘d’ (in mm) between the crank centre to lever pivot centre point should be

                                                                                                            [GATE-2009]  

 (a) 144.3   (b) 216.5   (c) 240.0          (d) 250.0

  

14. Match the following                                                                     [GATE-2004]

                                               

       Type of Mechanism                                        Motion achieved

P. Scott - Russel mechanism               1. Intermittent motion

Q. Geneva mechanism                         2. Quick return motion

R. Off-set slider-crank mechanism     3. Simple harmonic motion

S. Scotch Yoke mechanism                4. Straight line motion

 

(a) P-2 Q-3 R-1 S-4 (b) P-3 Q-2 R-4 S-1

(c) P-4 Q-1 R-2 S-3 (d) P-4 Q-3 R-1 S-2

 

15. The lengths of the links of a 4-bar linkage with revolute pairs only are p,q, r, and s units. iven that p < q < r < s. Which of these links should be the fixed one, for obtaining a "double crank" mechanism?                                                       [GATE-2003]

(a) Link of length p                  (b) link of length q

(c) Link of length r                  (d) link of length s

 

16.There are two points P and Q on a planar rigid body. The relative velocity between the two points                                                                               [GATE-2003]

(a) Should always be along PQ                      

(b) Can be oriented along any direction

(c) Should always be perpendicular to PQ

(d) Should be along QP when the body undergoes pure translation

 

 

17. Match List I with List II and select the correct answer               [IES-2002]

List I (Kinematic pairs)                       List II (Practical example)

 

A. Sliding pair                         1. A road roller rolling over the ground

B. Revolute pair                                  2. Crank shaft in a journal bearing in an engine

C. Rolling pair                         3. Ball and socket joint

D. Spherical pair                                 4. Piston and cylinder

5. Nut and screw

 

     A    B   C   D                                       A   B   C   D

(a) 5    2    4   3                                    (b) 4   3   1    2

(c) 5    3    4   2                                    (d) 4   2   1    3

 

18. A round bar A passes through the cylindrical hole in B as shown in the given figure. Which one of the following statements is correct in this regard?           [IES-1995]

 

 

 

(a) The two links shown from a kinematic pair.         

(b) The pair is completely constrained.

(c) The pair has incomplete constraint.      

(d) The pair is successfully constrained.

 

 

19. Consider the following statements                                                           [IES-2000]

1. A round bar in a round hole form a turning pair

2. A square bar in a square hole forms a sliding pair

3. A vertical shaft in a footstep bearing forms a successful constraint.

Of these statements

(a) 1 and 2 are correct (b) 1 and 3 are correct

(c) 2 and 3 are correct           (d) 1,2 and 3 are correct

 

20. Match List I with List II and select the correct answer using the codes given below the lists:                                                                                                   [IES-1999]

                        List I                                                                    List II

A. 4 links 4 turning pairs                                             1. Complete constraint

B. 3 links 3 turning pairs                                             2. Successful constraint

C. 5 links 5 turning pairs                                             3. Rigid frame

D. Footstep bearing                                                    4. Incomplete constraint

     A    B   C   D                                       A   B   C   D

(a) 3    1    4   2                                    (b) 1   3   2    4

(c) 3    1    2   4                                    (d) 1   3   4    2

 

21. Consider the following statements:

1. The degree of freedom for lower kinematic pair is always equal to one.

2. A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair.

3. Oldham’s coupling mechanism has two prismatic pairs and two revolute pairs.

Which of the statements given above is/are correct?

(a) 1,2 and 4  (b) 1 and 3        (c)2,3 and 4    (d)1,2,3 and 4

 

22. Which of the following are examples of forced closed kinematic pairs? [IES-2003]

1. Cam and roller mechanism 2. Door closing mechanism

3. Slider-crank mechanism      4. Automotive clutch operating mechanism

Select the correct answer using the codes given below:

Codes:

(a) 1, 2 and 4 (b) 1 and 3 (c) 2, 3 and 4 (d) 1, 2, 3 and 4

 

23. Assertion (A): Hydraulic fluid is one form a link.

Reason (R): A link need not necessarily be a rigid body but it must be a resistant body.                                                                                                                             [IES-1996]

(a) Both A and R are individually true and R is the correct explanation of A

(b) Both A and R are individually true but R is not the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

 

 

MCQ on Common Observations

MCQ ON COMMON OBSERVATIONS

1.Most soluble in water is

a) Camphor                        b) Sugar                               c) Sulphur                            d) Common Salt

2.Photosynthesis is

a) an exothermic process                                             b) an endothermic process

c) a neutral process                                                         d) a thermostatic process

3.Which one of the following substance exhibit the property of sublimation ?

a) Ice                                     b) Wax                                  c) Camphor                         d) Ethyl alcohol

4.Water is neither acidic nor alkaline because

a) It cannot accept or donate protons

b) It boils at a high temperature

c) It can dissociate into equal number of hydrogen ions

d) It cannot donate or accept electrons

5.Very small time intervals are accurately measured by the

a) Pulsars                             b) Quartz clocks                                c) Atomic clocks                                d) White dwarfs

6.An ordinary tube light used for lighting purposes contains

a) Fluorescent material and an inert gas

b) One filament , reflective material and mercury vapour

c) Fluorescent material and mercury vapour

d) Two filaments, fluorescent material and mercury vapour

7.The jet plane engine works on the principle of

a) Mass                                b) Linear momentum     c) Energy                             d) Angular momentum

8.The working of the quartz crystal in the watch is based on

a) Johnson effect                                                             b) Photoelectric effect

c) Edison effect                                                                 d) Piezo electric effect

9.A handwritten message can be instantly transmitted as such to any part of the world through

a) Speed post                    b) Telex                                                c) Electronic Mail              d) FAX

10.The number of points in a mariner’s compass is

a) 64                                      b) 32                                      c) 24                                       d) 8

11.Rocket works on the principle of

a) Conservation of mass                                                               b) Conservation of energy

c) Conservation of momentum                                  d) None of these

12.In an electronic watch, the component corresponding to a pendulum of a pendulum clock is

a) Transistor                       b) Balance wheel             c) Crystal oscillator           d) Diode

13.The silvered surface of thermo flask prevents transfer of heat by

a) Conduction                    b) Convection                    c) Radiation                        d) All of these

14.A pendulum clock will run faster at one of the following places than others

a) Mine                                b) Sea shore                       c) On a mountain             d) 20^th Floor of a building

15.When ice melts into water, its

a) Volume increases                                                       b) Mass increases

c) Volume decreases                                                      d) Mass decreases

16.The weight of an object would be minimum when it is placed,

a) At the equator                                                             b) At the north pole

c) At the south pole                                                        d) At the centre of the earth

17.When an open bottle of scent is kept in a corner of the room, its odour is felt in all the corners. This is due to the phenomenon of

a) Vaporisation                 b) Evaporation                  c) Diffusion                         d) Sublimation

18.With rise in temperature, the speed of sound

a) Increases                        b) Drops                               c) Remains the same      d) Changes

19.When a constant force is applied to a body, it moves with uniform

a) Speed                              b) Velocity                          c) Acceleration                  d) Momentum

20.A piece of paper and a cricket ball are dropped simultaneously from the same height. They will strike the ground simultaneously, if they

a) have the same volume                                             b) have the same mass

c) have the same density                                             d) are in vacuum

21.The time period of a pendulum on moon

a) Becomes zero              b) Increases                       c) Remains same              d) Decreases

22.A piece of wood is floating in water. If we heat the water, the piece of wood will

a) Increases in size                                                          b) Rise a little                                                                    

c) Float at the same level                                              d) Sink a little

23.A pond is covered with a layer of ice and the external temperature is   - 300 C. The temperature of water in contact with the lower surface of ice is

a) 4⁰ C                                    b) 0^o C                                   c) -15^o C                                d) -30⁰ C

24.Two objects losing the same weight when immersed in water must have the same

a) Weight in water           b) Volume                           c) Weight in air                  d) Density

 

25.If the density of water at 0o C, 40 C and 1000 C are denoted by X,Y and Z respectively. Then the correct sequence of their decreasing order is

a) X,Y,Z                                 b) Y,Z,X                                 c) Y,X,Z                                 d) Z,Y,X

26.Friction can be reduced by

a) Dynamic to static                                                         b) Rolling to sliding

c) Sliding to rolling                                                            d) None of theses

27.An air bubble in water will act like a

a) Convex mirror              b) concave mirror            c) Convex lens                   d) Concave lens

28.When a person is standing on a weighing scale in a lift and the lift is moving upwards, then the weighing scale will show

a) Actual weight of the person                                   b) Less weight

c) Higher weight                                                               d) Zero reading

29.Clear nights are colder than cloudy nights because of

a) Conduction                    b) Condensation              c) Radiation                        d) Insolation

30.On which of the following factors does the temperature of steam in a pressure cooker depend ?

a) Material of which cooker is made                        b) Temperature of the flame

c) Quantity of cooking material                                  d) Size of the pressure cooker

31.Nights are cooler in the desert because

a) Sand radiates heat less quickly as compared to earth

b) The sky is generally clear                                        

c) Sand radiates heat more quickly as compared to earth

d) The sky is generally cloudy

32.Pouring of kerosene oil on stagnant water reduces mosquito problem because

a) It is highly toxic to the mosquitoes                      b) It interrupts the mating of adults

c) It repels the mosquitoes                                          d) It interrupts the breathing of larvae  

33.When water is heated from 00 C to 100 C, the volume of water

a) Increases steadily                                                       b) Decreases steadily

c) First increases then decreases                              d) First decreases then increases

34.When a person enters a dark room from bright light, he cannot see anything clearly for some times. Slowly, he starts seeing things. This is because

a) The length of lens increases                                   b) The iris expands

c) The iris contracts                                                         d) The distance between lens and retina increases

35.Burns caused by the steam are much more severe than those caused by boiling water as

a) Steam is a gas and engulfs the body quickly    b) Temperature of steam is higher

c) Steam pierces through the pores of body quickly

d) Steam has latent heat

36.If you float on your back, on water, your weight will be

a) Less than the weight of water displaced by you

b) Zero                                 b) Half of your normal weight                     d) equal to your normal weight 

37.Due to which of the following a shaving blade when placed gently on water floats ?

a) Surface tension           b) Viscosity                         c) Law of Floatation         d) Archimedes principle

38.Which of the following type of wood(s) is/are specially used as railway sleepers ?

a) Mahogany                     b) Ivory wood                    c) Green heart wood      d) Jarrah and Barri

39.	Assertion	(A)	:	Telephone wires sag more in summer
	Reason	(R)	:	Thus expand due to summer heat

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

40.	Assertion	(A)	:	Leakages in household gas cylinders can be detected
	Reason	(R)	:	LPG contains ethyl merceptan which is smelling agent

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

41.	Assertion	(A)	:	Uranium undergoes nuclear fusion reaction
	Reason	(R)	:	It has a big, unstable nucleus

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

42.	Assertion	(A)	:	Soap removes oil and dirt
	Reason	(R)	:	Soap increases the surface tension of water

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

43.	Assertion	(A)	:	Air passengers sometimes feel pain in the ears when the plane rapidly loses height
	Reason	(R)	:	Atmospheric pressure is larger at lower altitude

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

44.	Assertion	(A)	:	Red phosphorus is used in match stick
	Reason	(R)	:	Red phosphorus is less dangerous compared to white

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

45.	Assertion	(A)	:	The escape velocity from the surface of the moon is less than that from the earth’s surface
	Reason	(R)	:	The moon has no atmosphere

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

46.	Assertion	(A)	:	Hydrometer measures the concentration of salt in a solution
	Reason	(R)	:	Hydrometer works on the principle of floating

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

47.	Assertion	(A)	:	The particle moving in a uniform circular motion has uniform velocity
	Reason	(R)	:	The particle also has uniform speed

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

48.	Assertion	(A)	:	Red light is generally used as a caution symbol
	Reason	(R)	:	It has a longer wave length

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

49.	Assertion	(A)	:	In high fedelity radio broadcasts frequency modulation (FM) is preferred over Amplitude Modulation (AM) for transmission purposes
	Reason	(R)	:	Atmospheric disturbances affect the amplitude of transmitted broadcast signals

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

50.	Assertion	(A)	:	Silver is not used to make electronic wires
	Reason	(R)	:	Silver is a bad conductor

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

51.	Assertion	(A)	:	When a gun is fired it recoils, i.e. it pushes back, which much less velocity  than the velocity of the bullet
	Reason	(R)	:	Velocity of the recoiling gun is less because the gun is much heavier than the bullet

a)      Both A and R are true and R is the correct explanation of A

b)      Both A and R are true But R is not the correct explanation of A

c)       A is true but R is false

d)      A is false but R is true

e)      Both A and R are false

52.Which one of the following has the highest Calorific Value ?

a) Butane                            b) Biogas                              c) Hydrogen                       d) Methane

53.The colour of light is determined by its

a) Velocity                           b) Amplitude                     c) Wavelength                   c) Frequency

54.Which of the following is not an Operating system in any Compute ?

a) Window                          b) Unix                                 c) MS-Dos                           d) Pentium

55.Which among the following is least prone to fire ?

a) Terrycot                          b) Nylon                               c) Rayon                               d) Cotton

56.If a wire of resistance R is melted and recast to half of it’s length then the new resistance of the wire will be

a) R/4                                    b) R/2                                    c) R                                         d) 2R

57.An electron microscope gives higher magnification than an optical microscope because

a) The wavelength of electrons is smaller as compared to the wavelength of visible light

b) The electrons have more energy than the light particulars

c) The electron microscope uses more powerful lenses

d) The velocity of electron is smaller than that of light

58.In an observation, αparticles, β particles and γ rays have same energies. This penetrating power in a given medium in increasing order will be

a) α,β,γ                            b) β,γ,α                            c) α,γ,β                             d) β,α,γ