DTS QUIZ -13

What is the advantage of using a worm gear system?

• A) High efficiency
• B) High speed capability
• C) High load carrying
• D) Low noise operation

Which of the following is true regarding worm gears?

• A) Transmit motion between non-parallel shafts.
• B) Used for high-speed applications.
• C) Are highly efficient.
• D) Have high tooth contact ratio.

What is the equivalent number of teeth for a worm gear system with a helix angle of 5 degrees and a gear ratio of 20?

• A) 100
• B) 110
• C) 120
• D) 130

How are the dimensions of a pair of straight bevel gears estimated?

• A) By using the equivalent number of teeth.
• B) By measuring the pitch diameter.
• C) By calculating the pitch angle.
• D) By measuring the pressure angle.

Which material is commonly used for worm gears?

• A) Aluminum
• B) Bronze
• C) Cast iron
• D) Stainless steel

What is the effect of increased helix angle on the worm gear system?

• A) Increased efficiency
• B) Increased load capacity
• C) Decreased sliding speed
• D) Decreased heat generation

A worm gear system has a gear ratio of 25:1 and a pitch diameter of 60mm. What is the center distance between the gears?

• A) 30 mm
• B) 35 mm
• C) 40 mm
• D) 45 mm

What is the thermal capacity of a worm gear made of steel with a pitch diameter of 40mm and a gear ratio of 20:1?

• A) 180 W
• B) 190 W
• C) 200 W
• D) 210 W

A pair of cross helical gears has a helix angle of 25 degrees and a center distance of 60mm. What is the gear ratio?

• A) 2:1
• B) 3:1
• C) 4:1
• D) 5:1

What are the demerits of using a worm gear system?

• A) Low efficiency
• B) High noise operation
• C) Limited speed capability
• D) Low load carrying