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Theory-of-machines Questions Set 33:

Quiz Mode

At what speed range (in rpm) can a Watt's governor work satisfactorily?

200-300 rpm

60-80 rpm

100-300 rpm

150-250 rpm

Solution:

A differential Gear train in an automobile is a

simple gear train

epicyclic gear train

compound gear train

none of these

Solution:

An engine working on the Otto cycle has a compression ratio of 7 and γ = 1.4. Find the air standard efficiency.

42.56%

45.55%

69.03%

54.08%

Solution:

The relationship between the number of pairs (p) forming a kinematic chain and the number of links (l) is:

l = 2p - 2

l = 2p - 3

l = 2p - 4

l = 2p - 5

Solution:

A Slider-Crank Mechanism consists of:

one revolute joint and three prismatic joints

four revolute joints

three revolute joints and one prismatic joint

two revolute joints and two prismatic joints

Solution:

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotors separately, are 200 Hz and 300 Hz respectively. What is the lowest critical speed (in rpm)?

9991 rpm

9984 rpm

9978 rpm

9977 rpm

Solution:

A fixed gear having 100 teeth meshes with another gear having 25 teeth, the center lines of both the gears being joined by an arm so as to form an epicyclic gear train. The number of rotations made by the smaller gear for one rotation of the arm is

Solution:

The flywheel of a steam engine has a radius of gyration of 1 m and mass of 2500 kg. The starting torque of the steam engine is 1500 N-m and may be assumed constant. Determine the angular acceleration of the flywheel.

0.5 rad/s^2

0.6 rad/s^2

0.9 rad/s^2

0.8 rad/s^2

Solution:

A machine requires 50 W and 80 W to be applied for 1500 N and 4500 N loads, respectively. Which of the following is the correct Power law of the machine? (P = Power in Watts, W = Load in Newtons)

None of the above

P = (W/100) + 30

P = (W/100) + 40

P = (W/100) + 35

Solution:

If the inside radius of the pulley rim is 150 mm and the angle subtended by the shoes at the center of the spider is 60°, find the net outward radial force of the centrifugal clutch. The intensity of pressure is 0.1 N/mm² and the width is 100 mm.

1823.7 N

1570.8 N

1289.4 N

1438.9 N

Theory-of-machines Questions Set 33:

At what speed range (in rpm) can a Watt's governor work satisfactorily?

Solution:

A differential Gear train in an automobile is a

Solution:

An engine working on the Otto cycle has a compression ratio of 7 and γ = 1.4. Find the air standard efficiency.

Solution:

The relationship between the number of pairs (p) forming a kinematic chain and the number of links (l) is:

Solution:

A Slider-Crank Mechanism consists of:

Solution:

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotors separately, are 200 Hz and 300 Hz respectively. What is the lowest critical speed (in rpm)?

Solution:

A fixed gear having 100 teeth meshes with another gear having 25 teeth, the center lines of both the gears being joined by an arm so as to form an epicyclic gear train. The number of rotations made by the smaller gear for one rotation of the arm is

Solution:

The flywheel of a steam engine has a radius of gyration of 1 m and mass of 2500 kg. The starting torque of the steam engine is 1500 N-m and may be assumed constant. Determine the angular acceleration of the flywheel.

Solution:

A machine requires 50 W and 80 W to be applied for 1500 N and 4500 N loads, respectively. Which of the following is the correct Power law of the machine? (P = Power in Watts, W = Load in Newtons)

Solution:

If the inside radius of the pulley rim is 150 mm and the angle subtended by the shoes at the center of the spider is 60°, find the net outward radial force of the centrifugal clutch. The intensity of pressure is 0.1 N/mm² and the width is 100 mm.

Solution:

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