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4

The locus of a point on a thread unwound from a cylinder will be

A. A straight line

B. A circle

C. Involute

D. Cycloidal

Correct Answer :

C. Involute


Related Questions

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4

A system of masses rotating in different parallel planes is in dynamic balance if the

A. Resultant force is equal to zero

B. Resultant couple is equal to zero

C. Resultant force and resultant couple are both equal to zero

D. Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

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4

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

A. Stable

B. Unstable

C. Isochronous

D. Hunt

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4

A body in motion will be subjected to coriolis acceleration when that body is

A. In plane rotation with variable velocity

B. In plane translation with variable velocity

C. In plane motion which is a resultant of plane translation and rotation

D. Restrained to rotate while sliding over another body

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4

Governor is used in automobile to

A. Decrease the variation of speed

B. Maximize the fuel economy

C. Limit the vehicle speed

D. Maintain constant engine speed

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4

Kinematic pairs are those which have

A. Point or line contact between the two elements when in motion

B. Surface contact between the two elements when in motion

C. Elements of pairs not held together mechanically

D. Two elements that permit relative motion

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4

The factor which affects the critical speed of a shaft is

A. Diameter of disc

B. Span of shaft

C. Eccentricity

D. All of these

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4

For the same lift and same angle of ascent, a smaller base circle will give

A. A small value of pressure angle

B. A large value of pressure angle

C. There is no such relation with pressure angle

D. Something else

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4

In automobiles the power is transmitted from gear box to differential through

A. Bevel gear

B. Universal joint

C. Hooke's joint

D. Knuckle joint

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4

In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

A. Minimise the effect of primary forces

B. Minimise the effect of secondary forces

C. Have perfect balancing

D. To start the locomotive quickly

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4

A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

A. Kinematically sound

B. Not sound

C. Soundness would depend upon which link is kept fixed

D. Data is not sufficient to determine same

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4

The primary unbalanced force is maximum _________ in one revolution of the crank.

A. Twice

B. Four times

C. Eight times

D. Sixteen times

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4

The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

A. Same

B. Different

C. Unpredictable

D. None of these

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4

In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as

A. Tractive force

B. Swaying couple

C. Hammer blow

D. None of these

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4

Kinematic pairs are those which have two elements that

A. Have line contact

B. Have surface contact

C. Permit relative motion

D. Are held together

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4

Which of the following is an inversion of a single slider crank chain?

A. Pendulum pump

B. Oscillating cylinder engine

C. Rotary internal combustion engine

D. All of these

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4

Effort of a governor is the

A. Mean force exerted at the sleeve for a given percentage change of speed

B. Workdone at the sleeve for maximum equilibrium speed

C. Mean force exerted at the sleeve for maximum equilibrium speed

D. None of the above

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4

A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

A. 1.4 N-s/m

B. 18.52 N-s/m

C. 52.92 N-s/m

D. 529.2 N-s/m

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4

A rotor supported at A and B carries two masses as shown in the below figure. The rotor is

A. Dynamically balanced

B. Statically balanced

C. Statically and dynamically balanced

D. Not balanced

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4

The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

A. Flexible coupling

B. Universal coupling

C. Chain coupling

D. Oldham's coupling

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4

The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

A. Dedendum

B. Addendum

C. Clearance

D. Working depth

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4

The included angle for the V-belt is usually

A. 10° to 20°

B. 20° to 30°

C. 30° to 40°

D. 60° to 80°

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4

A slider crank chain consists of following numbers of turning and sliding pairs

A. 1, 3

B. 2, 2

C. 3, 1

D. 4, 0

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4

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

A. Static friction

B. Dynamic friction

C. Limiting friction

D. Coefficient of friction

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4

A reed type tachometer use the principle of

A. Longitudinal vibration

B. Torsional vibration

C. Transverse vibration

D. Damped free vibration

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4

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

A. 5,367 r.p.m.

B. 6,000 r.p.m.

C. 9,360 r.p.m.

D. 12,000 r.p.m.

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4

In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

A. 10°-15°

B. 15°-25°

C. 25°-30°

D. 30°-40°

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4

In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

A. Infinity

B. Zero

C. Any +ve value

D. Any -ve value

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4

The example of higher pair is

A. Belt, rope and chain drives

B. Gears, cams

C. Ball and roller bearings

D. All of the above

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4

If the damping factor for a vibrating system is unity, then the system will be

A. Over damped

B. Under damped

C. Critically damped

D. Without vibrations

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4

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

A. 0.4985/ √δS

B. 0.5615/ √δS

C. 0.571/ √δS

D. 0.6253/ √δS