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WorksheetsBelt Drive Quiz
Total questions: 35
Worksheet time: 18mins
Flat belts are generally used for:
Short distance power transmission
Long distance power transmission
Precise motion transmission
High torque applications
Belt drive is preferred when shafts are:
Very close
At medium or long distance
Fixed rigidly
Intersecting at right angle
The velocity ratio of a belt drive neglecting slip is:
N1/N2 = D2/D1
N1/N2 = D1/D2
N1/N2 = (D1 + D2)/(D1 - D2)
N1/N2 = 1
In flat belts, slip occurs due to:
Excessive belt tension
Insufficient friction between belt and pulley
High speed only
Large pulley size
The ratio of driving tension (T1) to slack side tension (T2) is:
e^(μθ)
e^(θ/μ)
μθ
e^(T1 - T2)
Centrifugal tension in a belt is:
Proportional to mass of belt per unit length
Inversely proportional to velocity²
Constant irrespective of velocity
Zero for V-belts
Condition for maximum power transmission in flat belts:
T = Tc
T = 2Tc
T = 3Tc
T = 4Tc
Initial tension in a flat belt ensures:
Belt does not slip at rest
Reduced friction
Increased centrifugal force
None of these
V-belts compared to flat belts:
Transmit less power
Transmit more power
Transmit same power
Cannot be compared
Which is true about V-belt drive?
Higher slip than flat belt
No slip occurs
Smaller center distance
Cannot work at high speeds
The angle of groove in V-belt pulley is usually:
10°–20°
30°–40°
45°–60°
70°–80°
The power transmitted by V-belt depends on:
Belt speed only
Arc of contact
Belt tension, velocity, arc of contact
Pulley size only
Which is a disadvantage of V-belt drive?
Can run at high speed
Compact design
Higher initial cost
No slip
The efficiency of V-belts is generally:
40–50%
60–70%
75–80%
90–95%
In V-belt, effective angle of contact increases because:
Belt is thicker
Pulley groove provides wedging action
Friction decreases
Pulley diameter increases
For the same power, the number of V-belts required is:
More than flat belts
Less than flat belts
Same as flat belts
Independent of belt type
In an open belt drive, the angle of lap on the smaller pulley is usually:
90°
120°
160°–170°
210°–220°
The belt velocity recommended for flat belts is:
2–3 m/s
5–10 m/s
10–20 m/s
25–30 m/s
Thickness of flat belt is usually:
0.5–2 mm
3–10 mm
15–20 mm
25–30 mm
When shafts are very far apart, the type of belt drive used is:
Crossed belt drive
Open belt drive
Compound belt drive
V-belt drive
The efficiency of flat belts is generally:
50–60%
70–80%
90–95%
99%
Slip in flat belts reduces:
Belt thickness
Power transmitted
Pulley speed
Both b and c
Crowning of pulleys is provided to:
Reduce slip
Avoid belt misalignment
Increase velocity
Reduce noise
If coefficient of friction increases, the ratio T1/T2:
Increases
Decreases
Remains same
Becomes zero
Slip between belt and pulley is usually limited to:
0.5–1%
2–5%
10%
20%
The standard V-belt sections are designated as:
A, B, C, D, E
X, Y, Z
P, Q, R
1, 2, 3
The groove angle of V-belt pulley increases:
Power transmitted
Belt life
Efficiency
Centrifugal tension
The number of V-belts in a drive depends on:
Pulley diameter only
Power to be transmitted
Groove angle only
Belt material only
V-belt drive is most suitable for:
Long center distance
Very high power transmission
Short to medium center distances
Infinite life applications
The arc of contact in crossed belt drive is:
Greater than 180°
Less than 180°
Equal to 180°
Zero
In crossed belt drive, driven pulley rotates:
Same as driver
Opposite to driver
Variable
Cannot be determined
Centrifugal tension reduces:
Belt speed
Belt grip
Power transmitted
Both b and c
The main advantage of V-belts over flat belts is:
Lower cost
Higher efficiency
Higher power capacity
Longer life
Slip is more in:
Flat belts
V-belts
Both same
None
Maximum tension in belt is equal to:
Tight side tension
Slack side tension
Centrifugal tension
Tight side + centrifugal tension
