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Theory-of-machines Questions Set 25:

Quiz Mode

A type-writer constitutes a machine. (True/ False)

Solution:

How many degrees of revolution does a four-stroke diesel engine complete in one cycle?

180 degrees

270 degrees

360 degrees

720 degrees

Solution:

Out of the following, which tooth profile has a double curvature?

Involute tooth profile

Cycloidal tooth profile

Both option 1 and option 2

None of these

Solution:

If the speed of the engine varies between 390 rpm and 410 rpm in a cycle of operation, the coefficient of fluctuation of speed will be

0.01

0.04

0.02

0.05

Solution:

Which of the following mechanisms generates an exact straight-line motion?

Grasshopper's Mechanism

Robert's Mechanism

Hart's Mechanism

Tchebicheff Mechanism

Solution:

For a crank and slotted lever quick return mechanism, the angle β is 260°. Find the ratio of time of cutting stroke to time of quick return stroke.

0.2

2.6

2.4

1.8

Solution:

A single-cylinder, four-stroke gas engine has a piston area of about 0.025 m^2 and a stroke length of 0.26 m. It runs at 180 strokes per minute with a mean effective pressure of 5.7 × 10^5 N/m^2. Determine the indicated power.

11.31 kW

31.22 kW

60.74 kW

5.77 kW

Solution:

What is the maximum fluctuation of energy?

difference between the maximum and minimum energies

sum of the maximum and minimum energies

variations of energy above and below the mean resisting torque

the ratio of the mean resisting torque to the work done per cycle

Solution:

Two gears with 30 and 90 teeth respectively are in mesh. The pressure angle is 20 degrees, the module is 12, and the line of contact on each side of the pitch point is half the maximum length. What will be the height of the addendum for the larger gear?

10.50 mm

7.52 mm

6.50 mm

4.50 mm

Solution:

What is the direction of the Coriolis component of acceleration in a slotted lever-crank mechanism?

Along the sliding velocity vector

Along the direction of the crank

Along a line rotated 90° from the sliding velocity vector in a direction opposite to the angular velocity of the slotted lever

Along a line rotated 90° from the sliding velocity vector in the same direction as the angular velocity of the slotted lever

Theory-of-machines Questions Set 25:

A type-writer constitutes a machine. (True/ False)

Solution:

How many degrees of revolution does a four-stroke diesel engine complete in one cycle?

Solution:

Out of the following, which tooth profile has a double curvature?

Solution:

If the speed of the engine varies between 390 rpm and 410 rpm in a cycle of operation, the coefficient of fluctuation of speed will be

Solution:

Which of the following mechanisms generates an exact straight-line motion?

Solution:

For a crank and slotted lever quick return mechanism, the angle β is 260°. Find the ratio of time of cutting stroke to time of quick return stroke.

Solution:

A single-cylinder, four-stroke gas engine has a piston area of about 0.025 m^2 and a stroke length of 0.26 m. It runs at 180 strokes per minute with a mean effective pressure of 5.7 × 10^5 N/m^2. Determine the indicated power.

Solution:

What is the maximum fluctuation of energy?

Solution:

Two gears with 30 and 90 teeth respectively are in mesh. The pressure angle is 20 degrees, the module is 12, and the line of contact on each side of the pitch point is half the maximum length. What will be the height of the addendum for the larger gear?

Solution:

What is the direction of the Coriolis component of acceleration in a slotted lever-crank mechanism?

Solution:

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