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Current Affairs January 2024

What is the correct answer?

4

Relationship between the number of links (L) and number of pairs (P) is

A. P = 2L - 4

B. P = 2L + 4

C. P = 2L + 2

D. P = 2L - 2

Correct Answer :

C. P = 2L + 2


Related Questions

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4

Peaucelliers mechanism has

A. Eight links

B. Six links

C. Four links

D. Twelve links

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4

A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

A. a is +ve and b = 0

B. a = 0 and b is +ve

C. a is +ve and b is -ve

D. a is +ve and b is also +ve

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4

The factional torque for square thread at the mean radius r while raising load W is given by

A. T = W.r tan(φ - α)

B. T = W.r tan(φ + α)

C. T = W.r tanα

D. T = W.r tanφ

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4

The Coriolis component of acceleration acts

A. Along the sliding surface

B. Perpendicular to the sliding surface

C. At 45° to the sliding surface

D. Parallel to the sliding surface

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4

The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is

A. 9/8

B. 9/82

C. 9/16

D. 9/128

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4

The brake commonly used in railway trains is

A. Shoe brake

B. Band brake

C. Band and block brake

D. Internal expanding brake

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4

The unbalanced force due to reciprocating masses

A. Varies in magnitude but constant in direction

B. Varies in direction but constant in magnitude

C. Varies in magnitude and direction both

D. Constant in magnitude and direction both

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4

Flexible coupling is used because

A. It is easy to disassemble

B. It is easy to engage and disengage

C. It transmits shocks gradually

D. It prevents shock transmission and eliminates stress reversals

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4

Which of the following mechanisms produces mathematically an exact straight line motion?

A. Grasshopper mechanism

B. Watt mechanism

C. Peaucellier's mechanism

D. Tchebicheff mechanism

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4

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

A. Cause withdrawing or throttling of steam

B. Reduce length of effective stroke of piston

C. Reduce maximum opening of port to steam

D. All of these

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4

Transmission of power from the engine to the rear axle of an automobile is by means of

A. Compound gears

B. Worm and wheel method

C. Hooke's joint

D. Crown gear

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4

A spring controlled governor is said to be isochronous when the controlling force

A. Increases as the radius of rotation decreases

B. Increases as the radius of rotation increases

C. Decreases as the radius of rotation increases

D. Remain constant for all radii of rotation

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4

Critical damping is a function of

A. Mass and stiffness

B. Mass and damping coefficient

C. Mass and natural frequency

D. Damping coefficient and natural frequency

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4

In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

A. (r₁ + r₂) (y/x)

B. (r₁ + r₂) (x/y)

C. (r₁ - r₂) (y/x)

D. (r₁ - r₂) (x/y)

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4

Torsional vibrations are said to occur when the particles of a body moves

A. Perpendicular to its axis

B. Parallel to its axis

C. In a circle about its axis

D. None of these

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4

The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

A. Unbalanced couples are caused only at higher speeds

B. Unbalanced forces are not dangerous at higher speeds

C. Effects of unbalances are proportional to the square of the speed

D. Effects of unbalances are directly proportional to the speed

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4

To connect two parallel and coplanar shafts the following type of gearing is used

A. Spur gear

B. Bevel gear

C. Spiral gear

D. None of the above

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4

A mechanism __________ for transmitting or transforming motion.

A. Can be used

B. Cannot be used

C. Unpredictable

D. None of these

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4

In a four stroke I.C. engine, the turning moment during the compression stroke is

A. Positive throughout

B. Negative throughout

C. Positive during major portion of the stroke

D. Negative during major portion of the stroke

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4

Rectilinear motion of piston is converted into rotary by

A. Cross head

B. Slider crank

C. Connecting rod

D. Gudgeon pin

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4

The secondary unbalanced force is __________ the primary unbalanced force.

A. One-half

B. Two-third

C. n times

D. 1/n times

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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

If the pressure angle is __________, a reciprocating follower will jam in its bearings.

A. Small

B. Too small

C. Large

D. Too large

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4

Which of the following is a higher pair?

A. Belt and pulley

B. Turning pair

C. Screw pair

D. Sliding pair

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4

The unbalanced primary forces in a reciprocating engine are

A. Balanced completely

B. Balanced partially

C. Balanced by secondary forces

D. Not balanced

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4

A pantograph is a mechanism with

A. Lower pairs

B. Higher pairs

C. Rolling pairs

D. Turning pairs

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4

In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

A. Less sensitive

B. More sensitive

C. Unaffected of sensitivity

D. Isochronous

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4

Which of the following statement is wrong?

A. A round bar in a round hole form a turning pair

B. A square bar in a square hole form a sliding pair

C. A vertical shaft in a foot step bearing forms a successful constraint

D. All of the above

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4

The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

A. Pitch circle

B. Base circle

C. Pitch curve

D. Prime circle

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4

In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed

A. Hartung governor

B. Wilson Hartnell governor

C. Pickering governor

D. Inertia governor