DTS QUIZ-10

Knowledge: What is the difference between a helical gear and a spur gear?

• a. The shape of the teeth
• b. The direction of the teeth
• c. The number of teeth
• d. The material of the gear

Knowledge: What is the pitch diameter of a helical gear?

• a. The diameter of the base circle
• b. The diameter of the pitch circle
• c. The diameter of the addendum circle
• d. The diameter of the dedendum circle

Knowledge: What is the angle between the helix and the gear axis called?

• a. Pressure angle
• b. Helix angle
• c. Addendum angle
• d. Dedendum angle

Comprehension: What is the purpose of a helical gear?

• a. To reduce noise and vibration
• b. To increase the load-carrying capacity
• c. To increase the efficiency of power transmission
• d. All of the above

Comprehension: What is the effect of increasing the helix angle of a helical gear?

• a. It increases the noise and vibration
• b. It decreases the load-carrying capacity
• c. It increases the axial thrust
• d. It decreases the axial thrust

Comprehension: What is the difference between a right-hand helical gear and a left-hand helical gear?

• a. The direction of rotation
• b. The direction of the helix
• c. The number of teeth
• d. The material of the gear

Application: A helical gear with 30 teeth has a pitch diameter of 60 mm and a helix angle of 20 degrees. What is the axial thrust on the gear?

• a. 21.2 N
• b. 12.1 N
• c. 28.7 N
• d. 15.9 N

Application: A helical gear with a pitch diameter of 100 mm and a helix angle of 25 degrees is transmitting 10 kW at 2000 rpm. What is the tangential force on the gear?

• a. 94.3 N
• b. 124.5 N
• c. 82.2 N
• d. 106.1 N

Application: A pair of helical gears has 20 and 30 teeth, respectively. The gears are to transmit 5 kW at 2000 rpm. What is the center distance between the gears?

• a. 105.3 mm
• b. 96.2 mm
• c. 120.5 mm
• d. 87.8 mm