113
77.5k

250+ Theory of Machines Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

Take a Test
101.

In case of V-belts

A. Belts should not touch the bottom of groove in pulley
B. Belts should touch the bottom of groove in pulley
C. Grooves in pulley are generally wider than the belt
D. Tension in belt remains constant throughout
E. The efficiency of transmission is less
Answer» B. Belts should touch the bottom of groove in pulley
discuss
102.

According to the law of gearing

A. Clearance should be minimum 0.15 mm
B. Teeth should be cycloidal type
C. Common normal at the point of contact always passes through a fixed point (pitch point) on the line joining the centres of rotation
D. The gears whould be cut with the cutter having same module
E. Teeth should be involute type
Answer» C. Common normal at the point of contact always passes through a fixed point (pitch point) on the line joining the centres of rotation
discuss
103.

In a V-belt having B section may be used when the load to be transmitted is

A. 60-75 HP
B. 3 to 20 HP
C. 30-60 HP
D. 75-90 HP
E. 100 HP
Answer» B. 3 to 20 HP
discuss
104.

A slider crank chain consists of

A. One turning and two sliding pairs
B. Two turning and one sliding pair
C. Three turning and one sliding pairs
D. One turning and one sliding pair
E. Two turning and two aliding pairs
Answer» C. Three turning and one sliding pairs
discuss
105.

In case of reciprocating engines the primary forces

A. Are fully balanced
B. Remain unbalanced
C. Are partially balanced
D. Cannot be balanced
E. None of the above
Answer» C. Are partially balanced
discuss
106.

Which one of the following is a transmission type dynamometer?

A. Prony brake
B. Rope brake
C. Hydraulic dynamometer
D. Electric generator types
E. None of the above
Answer» E. None of the above
discuss
107.

In case of gears the addendum is given by

A. 1.57 x module
B. 1.25 x module
C. ?/circular pitch
D. 2.157/module
E. One module
Answer» E. One module
discuss (1)
108.

The rectilinear motion of a piston is converted into rotary motion by

A. Cross-head
B. Piston pin
C. Connecting rod
D. Crank
E. Piston rod
Answer» C. Connecting rod
discuss
109.

In case of gears the pressure angle is

A. The angle between the line of action and the common tangent to the pitch surface in the plane of rotation
B. The angle between the normal to the point of contact and the shaft axis
C. The angle between the normal to dedendum at the path point and tangent to the dedendum at the path point and tangent to the dedendum at the same point
D. The angle of obliquity between the tangent drawn at the point of contact of the two mating gears
E. None of the above
Answer» A. The angle between the line of action and the common tangent to the pitch surface in the plane of rotation
discuss
110.

A swinging pendulum in its mid-position possesses

A. only the potential energy
B. only the kinetic energy
C. more kinetic energy and less potential energy
D. None of the above
E. None of the above
Answer» B. only the kinetic energy
discuss
111.

When the two elements of a pair are kept in contact with the help of a spring, the pair is known as

A. A lower pair
B. a higher pair
C. a closed pair
D. an unclosed pair
E. None of the above
Answer» D. an unclosed pair
discuss
112.

Which one of the following is a higher pair?

A. Tooth gearing mechanism
B. Thomoson indicator mechanism
C. Crossby indicator mechanism
D. Double McInnes Indicator mechanism
E. Hart's straight line mechanism
Answer» A. Tooth gearing mechanism
discuss
113.

The difference between a machine and a structure is

A. The machine serves to modify and transmit forces only whereas structures serve to modify and transmit mechanical work
B. The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
C. The relative motion exists between the parts of a structures whereas it does not exist in machines
D. Structures are temporary constructions whereas machines are paramanent
E. None of the above
Answer» B. The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
discuss
114.

In case of lower pairs

A. There is surface contact between the two elements while in the motion
B. There is line contact between the two elements while in the motion
C. There is point contact between the two elements while is motion
D. The contact is only at lower end of the two elements while in motion
E. None of the above
Answer» A. There is surface contact between the two elements while in the motion
discuss
115.

A 0.5 kg weight attached to a light spring elongates it 0.6 mm. The natural frequency of the system should be approximately

A. 6 Hz
B. 26 Hz
C. 36 Hz
D. 32 Hz
E. 16 Hz
Answer» E. 16 Hz
discuss
116.

A piston and cylinder in a slider crank mechanism form a

A. Sliding pair
B. Rolling pair
C. Cylindrical pair
D. Sliding pair
E. Turning pair
Answer» D. Sliding pair
discuss
117.

In case of reciprocating engine mechanism

A. The primary and secondary forces have same direction
B. The primary and secondary forces have same amplitude
C. The ratio of magnitude of primary forces of secondary forces is 2
D. The primary force has twoce the frequency of secondary force
E. None of the above
Answer» D. The primary force has twoce the frequency of secondary force
discuss
118.

At node of the shaft

A. The vibrations are inimum
B. The vibrations are maximum
C. The vibrations are average
D. The vibrations are zero
E. None of the above
Answer» D. The vibrations are zero
discuss
119.

In a well greased ball bearing the coefficient of friction may be in the range

A. 0.45 to 0.60
B. 0.25 to 0.45
C. 0.60 to 0.70
D. 0.70 to 0.80
E. 0.1 to 0.25
Answer» E. 0.1 to 0.25
discuss
120.

A vibrating system with unity as damping factor will be

A. Free from vibrations
B. Damped to 1% of critical speed
C. Damped to safe limits
D. Partly damped
E. Critically damped
Answer» E. Critically damped
discuss
121.

In case of spur gears the flank of the tooth is

A. The surface of the top of the tooth
B. The part of the tooth surface lying below the pitch surface
C. The curve forming face and flank
D. Radius that connects in the root circle to the profile of the tooth
E. The width of the gear tooth measured axially along the pitch surface
Answer» B. The part of the tooth surface lying below the pitch surface
discuss
122.

The number of links in a pantograph is equal to

A. 3
B. 4
C. 5
D. 7
E. 6
Answer» B. 4
discuss
123.

Module is expressed in

A. mm
B. mm/mm
C. mm/No. of teeth
D. Dimensionless
E. None of the above
Answer» A. mm
discuss
124.

In case of an elliptical trammel

A. One pair turns and three pairs slide
B. All four pairs slide
C. Three pairs turn and one pair slides
D. All four pairs turn
E. Two pairs turn and two pairs slide
Answer» E. Two pairs turn and two pairs slide
discuss
125.

Creep in belts is due to

A. Plasticity of belt material
B. Elasticity of belt material
C. Plastic deformation of belt material due to constant use
D. Differential elougation of belt due to difference in tension on two sides of a pulley
E. Elongation of belt due to tension
Answer» D. Differential elougation of belt due to difference in tension on two sides of a pulley
discuss
126.

Which one of the following is the inversion of slider crank mechanism

A. Reciprocating internal combustion engine
B. Crank and slotted level mechanism
C. Whitworth quick return mechanism
D. (A) and (B) above
E. (A), (B) and (C) above
Answer» E. (A), (B) and (C) above
discuss
127.

The radial depth of a ger tooth below the pitch circle is

A. Addendum + dedendum
B. Addendum
C. Addendum-clearance
D. Dedendum-clearance
E. Dedendum
Answer» E. Dedendum
discuss
128.

The pitch point on a cam is

A. Any point on pitch curve
B. The point on cam pitch circle having the maximum pressure angle
C. Any point on pitch curve
D. A point at a distance equal to pitch circle radius from the centre
E. None of the above
Answer» B. The point on cam pitch circle having the maximum pressure angle
discuss
129.

While evaluating the minimum number of teeth on a opinion the major consideration is

A. Operating speed
B. To minimise clearance
C. To avoid interference
D. The shaft diameter on which pinion is to be mounted
E. The minimum diameter of the pinion
Answer» C. To avoid interference
discuss
130.

Gears of watches are generally manufactured by

A. Stamping
B. Machining on a gear shaper
C. Power metallurgy process
D. Die casting
E. Machining on a hobber
Answer» A. Stamping
discuss
131.

The effect of creep in case of cross belt drive is

A. to increase power transmission
B. to increase the speed of driven pulley
C. to reduce the speed of driven pulley
D. None of the above
E. None of the above
Answer» C. to reduce the speed of driven pulley
discuss
132.

Isochronism in a governor is desirable when

A. One speed is desired under one load
B. The engine operates at high speeds
C. The engine operates at variable speeds
D. One speed is desired to be kept for all loads
E. The engine operatres at low speeds
Answer» D. One speed is desired to be kept for all loads
discuss
133.

In case of locomotives, the swaying couple is resisted by

A. Dead weight of the engine
B. Fish plates of the tails
C. Inside section of the rails
D. Side pressure between the flanges of the wheels
E. (C) and (D) together
Answer» E. (C) and (D) together
discuss
134.

A gear cutter suitable for cutting 42 to 54 teeth will provide correct form

A. For any gear having teeth anywhere between 42 to 54
B. For only 42 teeth gear
C. For only 54 teeth gear
D. For only 48 teeth gear
E. None of the above
Answer» A. For any gear having teeth anywhere between 42 to 54
discuss
135.

Sensitiveness of a governor is

A. The range of variation of engine speed
B. The ratio of the maximum speed to minimum speed within the operating range
C. The ratio of the difference between the maximum and mean speed to that of minimum to mean speed
D. The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed
E. None of the above
Answer» D. The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed
discuss
136.

A kinematic chain becomes a mechanism when

A. Any one link is fixed
B. There is no such criterion
C. None of the links are fixed
D. All link are fixed
E. First link is fixed
Answer» A. Any one link is fixed
discuss
137.

Module for gear is expressed in terms of

A. Number of teeth per unit diameter (mm)
B. Diameter (MM) per number of teeth
C. Millimeters
D. (mm)-1
E. None of the above
Answer» C. Millimeters
discuss
138.

Which is incorrect statement, if any

A. The force of friction is independent of the velocity of sliding
B. The force of friction is independent of the extent of the surfaces in contact
C. The force of friction is directly proportional to the pressure between the surfaces in contact
D. The laws of friction are true when the intensity of the pressure between the surfaces is small
E. None of the above
Answer» E. None of the above
discuss
139.

In the cam mechanism, a mushroom follower is

A. One with cylindrical roller held by a pin to the follower assembly
B. One provided with a flat face with a perfect flat plane
C. One identical to a knife edge follower with spherical end
D. One which moves irregularly with uniform movement of cam
E. One which moves in zig-zag path
Answer» B. One provided with a flat face with a perfect flat plane
discuss
140.

In a slider-crank mechanism

A. there are 4 turning pairs
B. one is a turning pair and 3 sliding pairs
C. two turning pairs and two sliding pairs
D. None of the above
E. Slider-crank mechanism
Answer» A. there are 4 turning pairs
discuss
141.

A nut and bolt form a

A. Helical pair
B. Sliding pair
C. Spherical pair
D. Turning pair
E. Rolling pair
Answer» A. Helical pair
discuss
142.

In case of meter gauge locomotives the distance between wheel centres is

A. 4 ft. 6 inch
B. 1 metre
C. 90.5 cm
D. 3 ft. 9? inch
E. None of the above
Answer» B. 1 metre
discuss
143.

Crowning is done on

A. Shafts
B. Gears
C. Pulleys
D. Bearings
E. Keys
Answer» C. Pulleys
discuss
144.

In case of gears the tooth fillet is

A. Width of the gear tooth
B. Radius that connects the root circle to the profile of the tooth
C. Surface of the top of the tooth
D. Curve forming face and flank
E. Part of the tooth surface lying below the pitch surface
Answer» B. Radius that connects the root circle to the profile of the tooth
discuss
145.

The sense of tangential acceleration of a link

A. Is the same as that of velocity
B. Is opposite to the velocity
C. Could be either the same or opposite to velocity
D. Is always in a plane perpendicular to the plane of motion
E. None of the above
Answer» C. Could be either the same or opposite to velocity
discuss
146.

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

A. All the belts have to be replaced
B. Broken belt may be replaced by the similar etc
C. Broken belt and at least one adjacent belt should be replaced
D. Broken belt and at least two adjacent belt should be replaced
E. None of the above
Answer» A. All the belts have to be replaced
discuss
147.

A pantograph is a mechanism or a kinematic arrangement comprising

A. A lower pair
B. Two lower pairs
C. Three lower pairs
D. 10 links
E. None of the above
Answer» B. Two lower pairs
discuss
148.

Which one of the following is lightest?

A. Sperm
B. 1 British ton
C. 1 Metric tonne
D. 1 US long ton
E. 1 US short ton
Answer» E. 1 US short ton
discuss
149.

The angle of a V-belt is

A. 60?
B. 35?
C. 45?
D. 40?
E. 30?
Answer» D. 40?
discuss
150.

A pantograph is a mechanism with

A. Rolling pairs
B. Higher pairs
C. Turning pairs
D. Lower pairs
E. Spherical pairs
Answer» D. Lower pairs
discuss

Done Studing? Take A Test.

Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.

Take a Test