CIVILWAR DAY 10 - KWA - SURVEY - INTRO , MECH - GEAR TERMINOLOGY

The shrinkage factor of an old map is 15/16 and the original scale is 1/1500, then the shrunk scale will have a R.F ?

• 1/1500
• 1/2500
• 1/1600
• 1/2000

Answer explanation

Shrunk scale = shrinkage factor × original scale = (15/16) × (1/1500) = 1/1600

Which type of gear is used for transmitting power between two non-parallel, intersecting shafts?

• Bevel gear
• Helical gear
• Spur gear
• Rack and pinion

Answer explanation

Bevel gears are used for intersecting shafts.

Correct Area = ?

• (m/c)² × M.A
• (M.A)³ × m c
• (M.A)² × c m
• (M.A)³ × c m

Answer explanation

Correct area formula = (shrunk length/original length)² × measured area

Which gear has teeth cut on the periphery of a cylinder and is used for high-speed applications?

• Helical gear
• Bevel gear
• Worm gear
• Rack gear

Answer explanation

Helical gears have teeth cut at an angle on the cylinder and are suitable for high-speed applications.

Match the following List 1 | List 2 a) Gunter's chain → (ii) 20.12 m b) Revenue chain → (iii) 10.05 m c) Engineer's chain → (i) 30.48 m

• a-(i), b-(ii), c-(iii)
• a-(iii), b-(i), c-(ii)
• a-(ii), b-(iii), c-(i)
• a-(ii), b-(i), c-(iii)

Answer explanation

Gunter’s chain = 20.12 m, Revenue chain = 10.05 m, Engineer’s chain = 30.48 m

Which relation is true in the case of a direct vernier?

• nv = (n−1)s
• nv = (n+1)s
• nv = (2n−1)s
• None of these

Answer explanation

For direct vernier: n divisions of vernier = (n−1) divisions of main scale.

What is backlash of a gear?

• Radial distance between the two points
• Top surface of the tooth
• Difference between tooth space and tooth thickness
• None of the above

Answer explanation

Backlash is the difference between tooth space and tooth thickness.

Which one of the following gears can connect non-parallel and non-intersecting shafts?

• Spur gear
• Worm gear
• Bevel gear
• Helical gear

Answer explanation

Worm gears are used to connect non-parallel and non-intersecting shafts.

In spur gears, the teeth are

• Parallel to the axis of rotation
• Inclined to the axis of rotation
• Curved in profile
• Helical in form

Answer explanation

Spur gear teeth are cut parallel to the axis of rotation.

Plan of an area has shrunk such that a line originally 10 cm long now measures as 9.5 cm. If the original scale was 1 cm = 10 m, determine shrinkage factor.

• 95
• 0.95
• 9.5
• 0.095

Answer explanation

Shrinkage factor = Shrunk length ÷ Original length = 9.5 ÷ 10 = 0.95