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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 6
Q1 | Which one of the following is the inversion of slider crank mechanism
- Reciprocating internal combustion engine
- Crank and slotted level mechanism
- Whitworth quick return mechanism
- (A) and (B) above
- (A), (B) and (C) above
Q2 | The radial depth of a ger tooth below the pitch circle is
- Addendum + dedendum
- Addendum
- Addendum-clearance
- Dedendum-clearance
- Dedendum
Q3 | The pitch point on a cam is
- Any point on pitch curve
- The point on cam pitch circle having the maximum pressure angle
- Any point on pitch curve
- A point at a distance equal to pitch circle radius from the centre
- None of the above
Q4 | While evaluating the minimum number of teeth on a opinion the major consideration is
- Operating speed
- To minimise clearance
- To avoid interference
- The shaft diameter on which pinion is to be mounted
- The minimum diameter of the pinion
Q5 | Gears of watches are generally manufactured by
- Stamping
- Machining on a gear shaper
- Power metallurgy process
- Die casting
- Machining on a hobber
Q6 | The effect of creep in case of cross belt drive is
- to increase power transmission
- to increase the speed of driven pulley
- to reduce the speed of driven pulley
- None of the above
- None of the above
Q7 | Isochronism in a governor is desirable when
- One speed is desired under one load
- The engine operates at high speeds
- The engine operates at variable speeds
- One speed is desired to be kept for all loads
- The engine operatres at low speeds
Q8 | In case of locomotives, the swaying couple is resisted by
- Dead weight of the engine
- Fish plates of the tails
- Inside section of the rails
- Side pressure between the flanges of the wheels
- (C) and (D) together
Q9 | A gear cutter suitable for cutting 42 to 54 teeth will provide correct form
- For any gear having teeth anywhere between 42 to 54
- For only 42 teeth gear
- For only 54 teeth gear
- For only 48 teeth gear
- None of the above
Q10 | Sensitiveness of a governor is
- The range of variation of engine speed
- The ratio of the maximum speed to minimum speed within the operating range
- The ratio of the difference between the maximum and mean speed to that of minimum to mean speed
- The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed
- None of the above
Q11 | A kinematic chain becomes a mechanism when
- Any one link is fixed
- There is no such criterion
- None of the links are fixed
- All link are fixed
- First link is fixed
Q12 | Module for gear is expressed in terms of
- Number of teeth per unit diameter (mm)
- Diameter (MM) per number of teeth
- Millimeters
- (mm)-1
- None of the above
Q13 | Which is incorrect statement, if any
- The force of friction is independent of the velocity of sliding
- The force of friction is independent of the extent of the surfaces in contact
- The force of friction is directly proportional to the pressure between the surfaces in contact
- The laws of friction are true when the intensity of the pressure between the surfaces is small
- None of the above
Q14 | In the cam mechanism, a mushroom follower is
- One with cylindrical roller held by a pin to the follower assembly
- One provided with a flat face with a perfect flat plane
- One identical to a knife edge follower with spherical end
- One which moves irregularly with uniform movement of cam
- One which moves in zig-zag path
Q15 | In a slider-crank mechanism
- there are 4 turning pairs
- one is a turning pair and 3 sliding pairs
- two turning pairs and two sliding pairs
- None of the above
- Slider-crank mechanism
Q16 | A nut and bolt form a
- Helical pair
- Sliding pair
- Spherical pair
- Turning pair
- Rolling pair
Q17 | In case of meter gauge locomotives the distance between wheel centres is
- 4 ft. 6 inch
- 1 metre
- 90.5 cm
- 3 ft. 9? inch
- None of the above
Q18 | Crowning is done on
- Shafts
- Gears
- Pulleys
- Bearings
- Keys
Q19 | In case of gears the tooth fillet is
- Width of the gear tooth
- Radius that connects the root circle to the profile of the tooth
- Surface of the top of the tooth
- Curve forming face and flank
- Part of the tooth surface lying below the pitch surface
Q20 | The sense of tangential acceleration of a link
- Is the same as that of velocity
- Is opposite to the velocity
- Could be either the same or opposite to velocity
- Is always in a plane perpendicular to the plane of motion
- None of the above
Q21 | A beater machine in a pulp mill is driven by a 50 H.P. motor using 6 vee belts of D section. If one of the belt breaks after a month
- All the belts have to be replaced
- Broken belt may be replaced by the similar etc
- Broken belt and at least one adjacent belt should be replaced
- Broken belt and at least two adjacent belt should be replaced
- None of the above
Q22 | A pantograph is a mechanism or a kinematic arrangement comprising
- A lower pair
- Two lower pairs
- Three lower pairs
- 10 links
- None of the above
Q23 | Which one of the following is lightest?
- Sperm
- 1 British ton
- 1 Metric tonne
- 1 US long ton
- 1 US short ton
Q24 | The angle of a V-belt is
- 60?
- 35?
- 45?
- 40?
- 30?
Q25 | A pantograph is a mechanism with
- Rolling pairs
- Higher pairs
- Turning pairs
- Lower pairs
- Spherical pairs