Home
Current Affairs January 2024

What is the correct answer?

4

In which of the following type of gear train the first gear and the last gear are co-axial.

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. None of the above

Correct Answer :

C. Reverted gear train


Related Questions

What is the correct answer?

4

The danger of breakage and vibration is maximum

A. Below the critical speed

B. Near the critical speed

C. Above the critical speed

D. None of these

What is the correct answer?

4

In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

A. Depends upon

B. Is independent of

C. Either A or B

D. None of these

What is the correct answer?

4

The ratio of the driving tensions for V-belts is __________ times that of flat belts. (Where β = Semi-angle of the groove)

A. sinβ

B. cosβ

C. cosecβ

D. secβ

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

The height of a Watt's governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis)

A. 8.95/N²

B. 89.5/N²

C. 895/N²

D. 8950/N²

What is the correct answer?

4

The minimum force required to slide a body of weight W on a rough horizontal plane is

A. W sinθ

B. W cosθ

C. W tanθ

D. W cosecθ

What is the correct answer?

4

In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as

A. Tractive force

B. Swaying couple

C. Hammer blow

D. None of these

What is the correct answer?

4

Which type of gearing is used in steering system of an automobile?

A. Rack and pinion

B. Worm and wheel

C. Spiral gears

D. None of the above

What is the correct answer?

4

The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

A. μwr

B. ¾μWR

C. (2/3) μWR

D. ½μWR

What is the correct answer?

4

A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

A. 2 mm

B. 2.22 mm

C. 2.50 mm

D. 3.0 mm

What is the correct answer?

4

The lower pair is a

A. Open pair

B. Closed pair

C. Sliding pair

D. Point contact pair

What is the correct answer?

4

The rotating shafts tend to vibrate violently at whirling speeds because

A. The system is unbalanced

B. Bearing centre line coincides with the axis

C. The shafts are rotating at very high speeds

D. Resonance is caused due to the heavy mass of the rotor

What is the correct answer?

4

Which of the following is an open pair?

A. Ball and socket joint

B. Journal bearing

C. Lead screw and nut

D. Cam and follower

What is the correct answer?

4

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

A. Four times the first one

B. Same as the first one

C. One fourth of the first one

D. One and a half times the first one

What is the correct answer?

4

The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

A. (1/2) μ W R cosec α

B. (2/3) μ W R cosec α

C. (3/4) μ W R cosec α

D. μ W R cosec α

What is the correct answer?

4

In railway axle boxes, the bearing used is

A. Deep groove ball bearing

B. Double row self aligning ball bearing

C. Double row spherical roller bearing

D. Cylindrical roller bearing

What is the correct answer?

4

A shaft carrying three rotors will have

A. No node

B. One node

C. Two nodes

D. Three nodes

What is the correct answer?

4

Which gear train is used for higher velocity ratios in a small space?

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. Epicyclic gear train

What is the correct answer?

4

In under damped vibrating system, the amplitude of vibration

A. Decreases linearly with time

B. Increases linearly with time

C. Decreases exponentially with time

D. Increases exponentially with time

What is the correct answer?

4

In its simplest form, a cam mechanism consists of following number of links

A. 1

B. 2

C. 3

D. 4

What is the correct answer?

4

In a pantograph, all the pairs are

A. Turning pairs

B. Sliding pairs

C. Spherical pairs

D. Self-closed pairs

What is the correct answer?

4

If the opposite links of a four bar linkage are equal, the links will always form a

A. Triangle

B. Rectangle

C. Parallelogram

D. Pentagon

What is the correct answer?

4

In a single slider crank chain

A. Each of the four pairs is a turning pair

B. One is a turning pair and three are sliding pairs

C. Two are turning pairs and two are sliding pairs

D. Three are turning pairs and one is a sliding pair

What is the correct answer?

4

A shaft carrying two rotors at its ends will have

A. No node

B. One node

C. Two nodes

D. Three nodes

What is the correct answer?

4

The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

A. Equal

B. Real

C. Complex conjugate

D. None of these

What is the correct answer?

4

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

A. 2π. √(g/δ)

B. 1/2π. √(g/δ)

C. 2π. √(δ/g)

D. 1/2π. √(δ/g)

What is the correct answer?

4

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

A. Free vibration

B. Forced vibration

C. Damped vibration

D. Under damped vibration

What is the correct answer?

4

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

A. Will remain same

B. Will change

C. Could change or remain unaltered depending on which link is fixed

D. Will not occur

What is the correct answer?

4

The purpose of a link is to

A. Transmit motion

B. Guide other links

C. Act as a support

D. All of the above