Theory Of Machines Set 2 MCQs

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

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

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