# Theory of Machines MCQ

### What is it not connected to?

Answer

Correct Answer: The frame

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### What type of chain is not connected to the frame?

Answer

Correct Answer: Floating link

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### In what way does a flexible link transmit motion?

Answer

Correct Answer: Partly deformed

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### What is a link called that does not undergo any deformation while transmitting motion?

Answer

Correct Answer: Rigid

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### What does a link called rigid not undergo while transmitting motion?

Answer

Correct Answer: Deformation

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### What are the bodies that make up a link?

Answer

Correct Answer: Resistant

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### What is the function of a Link?

Answer

Correct Answer: Connecting other parts which have motion relative to it

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### What is the term for this type of part?

Answer

Correct Answer: Element

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### What is the purpose of a machine?

Answer

Correct Answer: Transforms energy available in one form or another to do the desired work

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### What does the machine transform?

Answer

Correct Answer: Energy available in one form or another

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### What motion does the link have that makes it difficult to attach it to the ground?

Answer

Correct Answer: Complex

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### What does the link not have?

Answer

Correct Answer: Attached to ground

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### What type of rocking motion does a rocker have?

Answer

Correct Answer: Oscillatory motion

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### What sort of motion does a rocke rhave when pivoted to the ground?

Answer

Correct Answer: Oscillatory

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### If a crank is pivoted to ground, it makes what kind of revolutions?

Answer

Correct Answer: Complete

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### What determines the length of a crank's stroke?

Answer

Correct Answer: Ground

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### What is a ground?

Answer

Correct Answer: Any link or links that are fixed, nonmoving with respect to the reference frame

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### What are links that are fixed, nonmoving with respect to the reference frame called?

Answer

Correct Answer: Ground

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### What type of machine is designed to do work?

Answer

Correct Answer: Mechanism

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### What does a machine do?

Answer

Correct Answer: Work

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### What is the name of the chain's type?

Answer

Correct Answer: Grounded kinematic Chain

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### What type of movement is the chain's movement?

Answer

Correct Answer: Grounded kinematic

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### What is another term for a kinematic chain?

Answer

Correct Answer: Links joined together for motion

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### What are some of the links that make up a kinematic chain?

Answer

Correct Answer: Joined together for motion

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### What does the term "Joint order" refer to?

Answer

Correct Answer: The number of links joined minus one

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### What does the term "force-closed joint" mean?

Answer

Correct Answer: Requires some external force to keep the links together

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### What does a force-closed joint require?

Answer

Correct Answer: Some external force to keep the links together

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### What is a form-closed joint?

Answer

Correct Answer: One in which the links are kept together form

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### How many degrees of freedom does a half joint have?

Answer

Correct Answer: Two

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### What are full joints called?

Answer

Correct Answer: Lower pairs

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### What type of contact is in a lower pair?

Answer

Correct Answer: Surface contact

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### What is a higher pair of contacts called?

Answer

Correct Answer: Point or line contact

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### A connection between two or more links is called what?

Answer

Correct Answer: A joint

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### What are joints called when they connect two or more links?

Answer

Correct Answer: Kinematic pair

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### What kind of motion is a simultaneous combination of?

Answer

Correct Answer: Rotation and translation

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### What is the motion that is a combination of rotation and translation?

Answer

Correct Answer: Complex motion

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### What is a complex motion?

Answer

Correct Answer: A simultaneous combination of rotation and translation

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### What type of path does the body describe in a pure translation?

Answer

Correct Answer: Parallel

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### What does a body that has one point that does not move have?

Answer

Correct Answer: Rotation

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### All other points move in what shape?

Answer

Correct Answer: Circular arcs

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### Bicycle has a chain to provide what?

Answer

Correct Answer: Torque

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### What is another simple example of a kinematic system that contains a chain drive to provide torque?

Answer

Correct Answer: Bicycle

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### What is the term for a device that moves?

Answer

Correct Answer: Machine

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### Machines that move contain what?

Answer

Correct Answer: Kinematic elements

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### What do mechanisms typically provide in a machine?

Answer

Correct Answer: Significant forces and transmit significant power

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### Machine: typically contains mechanisms that are designed to provide significant forces and transmit significant what?

Answer

Correct Answer: Power

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### What is a mechanism?

Answer

Correct Answer: A device that transforms motion to some desirable pattern

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### What type of device transforms motion to some desirable pattern?

Answer

Correct Answer: Mechanism

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### The term "kinetics" refers to the study of what subject?

Answer

Correct Answer: Forces on systems in motion

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### What is the study of forces on systems in motion?

Answer

Correct Answer: Kinetics

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### What is kinematics the study of?

Answer

Correct Answer: Position, displacement, rotation, speed, velocity, and acceleration

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### What is the study of position, displacement, rotation, speed, velocity, and acceleration?

Answer

Correct Answer: Kinematics

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### Kinematics is the study of what?

Answer

Correct Answer: Motion

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### What field is the study of motion without regard to forces?

Answer

Correct Answer: Kinematics

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### Kinematics involves studying motion without regard to what?

Answer

Correct Answer: Forces

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### A kinematic chain must have at least

Answer

Correct Answer: Four links and four turning pairs

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### A cycle chain is a kinematic chain

Answer

Correct Answer: No

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### A V belt designated as C 3048/120 will have

Answer

Correct Answer: Approximately 120 inch inside length

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### The engine of an aeroplane rotates in a clockwise direction when seen from the tail end and the aeroplane takes a turn towards left. The effect of gyroscopic couple on aeroplane is

Answer

Correct Answer: To raise the nose and dip the tail

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### A belt drive is

Answer

Correct Answer: Not a positive drive

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### The type of governor used in record players for adjusting the speed of turntable generally is

Answer

Correct Answer: Pickering governor

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### The moment of friction with the assumption of uniform wear to uniform pressure is

Answer

Correct Answer: Lower

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### For speed reduction in the ratio of 100 the type of gear preferred is

Answer

Correct Answer: Worm and worm wheel

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### Can simple band brake be made self-energising type

Answer

Correct Answer: No

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### Klien's construction gives graphical construction for

Answer

Correct Answer: Both of above

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### A governor is said to be stable when

Answer

Correct Answer: There is one radius of the governor weights for each equilibrium speed

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### The maximum efficiency of a screw jack provided with square threads and angle of friction 30? will be

Answer

Correct Answer: 33%

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### Which of the following is a centrifugal type governor?

Answer

Correct Answer: Hartnell governor

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### In Locomotive operation, the swaying couple results due to

Answer

Correct Answer: Primary disturbing force

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### Hammer blow in locomotives results in

Answer

Correct Answer: Tendency to lift wheel from rails

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### In case of gears, the module is

Answer

Correct Answer: The length of the pitch circle diameter per tooth

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### The rotor of a ship rotates in anticlockwise direction when viewed from the bow end and the ship takes a left turn. The effect of gyroscopic couple on the ship is

Answer

Correct Answer: To raise the bow and lower then stern

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### In case of involute gears

Answer

Correct Answer: Pressure angle is constant throughout the teeth engagement

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### Which of the following oil has the highest specific gravity?

Answer

Correct Answer: Castor oil

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### If a particle of a link has a velocity when changes both in magnitude and direction at any instant, then

Answer

Correct Answer: It must have two components of acceleration e.g. centripetal, and tangential

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### The vibrations in which the restoring forces are not proportional to the displacements and the first power of velocity are known as

Answer

Correct Answer: Bearing vibrations

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### Which of the following is a higher pair?

Answer

Correct Answer: E. None of the above

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### In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when

Answer

Correct Answer: Half of the reciprocating masses are balanced by rotating masses

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### If a machine uses four V belts, while purchasing care should be taken to ensure that

Answer

Correct Answer: All above

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### A shaft having one end fixed has a disc oscillating freely at the other enIf the shaft stiffness, increases the natural frequency of vibrations will

Answer

Correct Answer: Increase

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### The pulley in a belt drive acts as

Answer

Correct Answer: Rolling pair

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### A dadial follower is

Answer

Correct Answer: One in which the follower translates along an axis passing through the cam centre of rotation

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### In the elliptical trammel mechanism, the midpoint of the link connecting the two sliders traverses

Answer

Correct Answer: A circular path

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### Klein's construction can be used when

Answer

Correct Answer: E. (A) and (C) above

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### Dynamic of machines deals with

Answer

Correct Answer: The forces acting on the parts of the machine

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### In case of spur gears the profile is

Answer

Correct Answer: The curve forming face and flank

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### The spring constant k of a coil-spring is

Answer

Correct Answer: E. directly proportional to the square of the number of coils in the spring

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### Coriorli's component of acceleration exists whenever a point moves along a path that has

Answer

Correct Answer: Rotational motion

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### In case of hypoid gears the mutual position of shafts will be

Answer

Correct Answer: Non-parallel, non-intersecting

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### Which of the following gears is free from axial thrust

Answer

Correct Answer: Herringbone gears

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### The number of forks provided in a Hooke's joint is

Answer

Correct Answer: Two

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### The mass moment of inertia is

Answer

Correct Answer: The resistance to angular acceleration

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### Coriolis component is encountered in

Answer

Correct Answer: Quick return mechanism

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### Pitch of gears is expressed by

Answer

Correct Answer: Any of the above

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### In a cam and follower mechanism, for the uniform velocity of the followers the displacement curve will have

Answer

Correct Answer: Constant slope

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### V-belts with E type cross-section are generally used in

Answer

Correct Answer: Heavy duty machines

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### Identify the incorrect statement if any

Answer

Correct Answer: In case of free vibrations the external force is applied at the ends only

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### Ackermann steering gear consists of

Answer

Correct Answer: Turning pair

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### In case of cross-helical worm the axes of two shafts are

Answer

Correct Answer: Non-parallel-non intersecting

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### A pulley in a belt-drive acts as a

Answer

Correct Answer: Wrapping pair

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### A cylindrical type cam is one

Answer

Correct Answer: With circumferential contour cut in the surface of the cylinder which rotates about its axis

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### The effect of creep in case of cross-belt drive is

Answer

Correct Answer: To reduce the speed of the driven pulley and consequently reduce the power output

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### Slip in turning belt is

Answer

Correct Answer: Zero

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### A reverted gear train is one is which

Answer

Correct Answer: The first and last gear are on the same shaft

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### The advantages of involute profile over cycloidal are given below. Identify if there is any incorrect statement

Answer

Correct Answer: The interference is inherently absent in this system

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