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Theory-of-machines Questions Set 9:

Quiz Mode

For a four-bar linkage in toggle position, the value of mechanical advantage is

0.0

0.5

1.0

∞

Solution:

If a gear has 36 teeth with a module of 6 mm, then calculate the tool width.

5.575 mm

7.765 mm

8.091 mm

9.421 mm

Solution:

In a diesel engine, the heat supplied is 55.63 kW and the heat rejected is 29.33 kW. Calculate the thermal efficiency.

26.3%

84.96%

47.28%

77.36%

Solution:

If the stroke length of the cylinder is 0.6 m and the speed of the crankshaft is 70 RPM, determine the piston speed.

84 m/s

42 m/s

116.67 m/s

140 m/s

Solution:

What is the relation between the height of a Watt's governor and speed?

directly proportional to speed

inversely proportional to speed

inversely proportional to (speed)^2

no relation

Solution:

Which of the following is equal to the dedendum circle diameter?

pitch circle diameter × sin(φ)

clearance circle diameter × cos(φ)

addendum circle diameter × cos(φ)

pitch circle diameter × cos(φ)

Solution:

The working depth of a gear is the radial distance from the pitch circle to the ________.

top of a tooth to the bottom of a tooth

addendum circle to the clearance circle

top of a tooth

bottom of a tooth

Solution:

What type of gear train is characterized by the axes of the shafts, over which the gears are mounted, moving relative to a fixed axis?

simple gear train

compound gear train

reverted gear train

epicyclic gear train

Solution:

In the starting stroke of an engine, if the pressure is 1 x 10^5 N/m^2, the volume is 105.88 m^3, the universal gas constant is 287 J/kg K, and the temperature is 293 Kelvin, then find the mass flow rate.

633.52 kg/hr

455.23 kg/hr

178.22 kg/hr

125.914 kg/hr

Solution:

A flywheel weighs 981/π kg and has a radius of gyration of 10 cm. It is given a spin of 100 rpm about its horizontal axis. The whole assembly is rotating about a vertical axis at 6 rad/sec. The gyroscopic couple experienced will be:

1.962 kgm

20,000 kgm

196.2 N-m

2000 N-m

Theory-of-machines Questions Set 9:

For a four-bar linkage in toggle position, the value of mechanical advantage is

Solution:

If a gear has 36 teeth with a module of 6 mm, then calculate the tool width.

Solution:

In a diesel engine, the heat supplied is 55.63 kW and the heat rejected is 29.33 kW. Calculate the thermal efficiency.

Solution:

If the stroke length of the cylinder is 0.6 m and the speed of the crankshaft is 70 RPM, determine the piston speed.

Solution:

What is the relation between the height of a Watt's governor and speed?

Solution:

Which of the following is equal to the dedendum circle diameter?

Solution:

The working depth of a gear is the radial distance from the pitch circle to the ________.

Solution:

What type of gear train is characterized by the axes of the shafts, over which the gears are mounted, moving relative to a fixed axis?

Solution:

In the starting stroke of an engine, if the pressure is 1 x 10^5 N/m^2, the volume is 105.88 m^3, the universal gas constant is 287 J/kg K, and the temperature is 293 Kelvin, then find the mass flow rate.

Solution:

A flywheel weighs 981/π kg and has a radius of gyration of 10 cm. It is given a spin of 100 rpm about its horizontal axis. The whole assembly is rotating about a vertical axis at 6 rad/sec. The gyroscopic couple experienced will be:

Solution:

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