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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 2
Q1 | A shaft having one end fixed has a disc oscillating freely at the other end. If the shaft stiffness, increases the natural frequency of vibrations will
- Increase
- Decrease
- There will be no effect
- Will depend on the stiffness of the disc
- None of the above
Q2 | If a machine uses four V belts, while purchasing care should be taken to ensure that
- All belts are same section
- All above
- All belts are of same batch number
- All belts are of same size
- All belts are of same manufacturers
Q3 | In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when
- Half of the reciprocating masses are balanced by rotating masses
- 1/2 of the reciprocating mass are balanced by equivalent rotating mass
- More than half of the reciprocating masses are balanced by rotating masses
- Reciprocating masses are balanced half by equivalent opposite reciprocating masses and the balance by rotating masses
- None of the above
Q4 | Which of the following is a higher pair?
- A shaft revolving in a bearing
- Piston reciprocating inside the cylinder
- Automobile steering gear
- Ball and socket
- None of the above
Q5 | The vibrations in which the restoring forces are not proportional to the displacements and the first power of velocity are known as
- Bearing vibrations
- Over damped vibrations
- Torsional vibrations
- Non-linear vibrations
- Under damped vibrations
Q6 | If a particle of a link has a velocity when changes both in magnitude and direction at any instant, then
- It must have three components of acceleration e.g. centripetal, centrifugal and gravitational
- It must have two components of acceleration e.g. centripetal, and tangential
- It must have three components of acceleration e.g. centripetal centrifugal and tangential
- It must have four components of acceleration e.g. centripetal, centrifugal gravitational and tangential
- It must have only unidirectional acceleration
Q7 | Which of the following oil has highest specific gravity?
- Turpentine
- Diesel
- Castor oil
- Petrol
- Sperm
Q8 | In case of involute gears
- Interference is inherently absent
- A convex flank is always in contact with concave flank
- Variation in centre distance of shafts increases radial force
- Pressure angle is constant throughout the teeth engagement
- None of the above
Q9 | The rotor of a ship rotates in anticlock wise direction when viewed from the bow end and the ship takes a left turn. The effect of gyroscopic couple on the ship is
- to lower the bow and raise the stern
- to raise the bow and lower then stern
- to roll the ship slightly clockwise when viewed fro bow end
- None of the above
- None of the above
Q10 | In case of gears, the module is
- The length of the pitch circule diameter per tooth
- The number of teeth per unit length on pitch circle diameter
- The pistance measured along the pitch circle from a point on one tooth to a corresponding point on the adjacent point
- Any of the above
- None of the above
Q11 | Hammer blow in locomotives results in
- Variable horizontal force
- Tendency to lift wheel from rails
- Uniform torque
- Pulsating torque
- Uneven speed
Q12 | In Iocomotive operation, the swaying couple results due to
- Primary disturbing force
- Use of double acting cylinders
- Hammer blow
- Use of two cylinders
- High speeds
Q13 | Which of the following is a centrifugal type governor?
- Watt governor
- Hartnell governor
- Porter governor
- All of the above
- None of the above
Q14 | The maximum efficiency of a screw jack provided with square threads and angle of friction 30? will be
- 47.50%
- 60%
- 25%
- 33%
- 50%
Q15 | A governor is said to be stable when
- There is one radius of the governor weights for each equilibrium speed
- There is minimum change of the radius of the governor weights at a operating speed
- The position of balls does not change within the operating speed
- The position of balls changes within permissible limits within the working range of a governor
- None of the above
Q16 | Klien's construction gives graphical construction for
- Both of above
- Acceleration polygon
- Slider-crank mechanism
- Velocity polygon
- Four bar chain mechanism
Q17 | Can simple band brake be made self-energising type
- No
- Yes, but with require several modifications
- Will not be economical
- Yes
- Yes, but with few limitations
Q18 | For speed reduction in the ratio of 100 the type of gear preferred is
- Spur gear
- Worm and worm wheel
- Bevel gear
- Hypoid gear
- Helical gear
Q19 | The moment of friction with the assumption of uniform wear to uniform pressure is
- Same
- Greater
- Lower
- (A) and (B) above
- (A) and (C) above
Q20 | The type of governor used in record players for adjusting the speed of turn table generally is
- Porter governor
- Proell governor
- Hartung governor
- Simple Watt's governor
- Pickering governor
Q21 | A belt drive is
- A positive drive
- Not a positive drive
- Meant for small torque transmission only
- Used only when the two pulleys have parallel axis
- None of the above
Q22 | The engine of an aeroplane rotates in a clockwise direction when seen from the tail end and the aeroplane takes a turn torwards left. The effect of gyroscopic couple on aeroplane is
- to raise the nose and dip the tail
- to dip the nose and raise the tail
- to roll the aeroplane slightly in the clockwise direction when viewed from tail end
- None of the above
- None of the above
Q23 | A V belt designated as C 3048/120 will have
- Approximately 120 inch inside length
- Approximately 120 cm inside length
- C section, length unspecified
- Width 120 mm
- None of the above
Q24 | A cycle chain is a kinematic chain
- Yes
- No
- Yes, provided the links are limited in number
- Yes provided the distance is limited
- None of the above
Q25 | A kinematic chain must have at least
- Four links and two turning pairs
- Four links and four turning pairs
- Four links and five turning pairs
- Two links and two turning pairs
- Three links and two turning pairs