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Browse complete papersThe friction torque developed in a cone clutch under axial load is mathematically identical to which bearing type?
Trapezoidal pivot bearing
Flat collar bearing
Conical pivot bearing
Flat pivot bearing
Correct answer
Trapezoidal pivot bearing
For roller chain drives, the chain pitch 'p' connects to the sprocket's pitch circle diameter 'd' (with T teeth) via this geometric relation:
\( P = d \sin(180^{\circ}/T) \)
\( P = d \sin(60^{\circ}/T) \)
\( P = d \sin(90^{\circ}/T) \)
\( P = d \sin(120^{\circ}/T) \)
Correct answer
\( P = d \sin(180^{\circ}/T) \)
For maximum power transmission in a belt drive, the condition is:
\( T_{max} = mv^2 \)
\( T_{max} = 3mv^2 \)
\( T_{max} = \frac{T_1+T_2}{2} \)
\( T_{max} = 3T_1 \)
Correct answer
\( T_{max} = mv^2 \)
In a centrifugal clutch, if the operational engagement speed needs to be doubled, what should be the incremental factor for the number of shoes?
1
0.5
4
2
Correct answer
1
For a disc clutch with n1 discs on the driving shaft and n2 on the driven shaft, the number of contact surface pairs is:
n1 + n2
n1 - n2
n1 + n2 + 1
n1 + n2 - 1
Correct answer
n1 + n2
Calculate the power delivered by a belt drive operating at a linear speed of 10 m/s, where the tension on the tight side is 2500 N and the tension on the slack side is 800 N.
17 kW
19 kW
20 kW
21 kW
Correct answer
17 kW
What is the total length L of a belt in an open belt drive connecting two pulleys of diameters d1 and d2 with a center distance x?
\( \frac{\pi}{2}(d_1 - d_2) + 2x + \frac{(d_1 + d_2)^2}{4x} \)
\( \frac{\pi}{2}(d_1 + d_2) + 2x + \frac{(d_1 - d_2)^2}{4x} \)
\( \frac{\pi}{2}(d_1 - d_2) + 2x + \frac{(d_1 - d_2)^2}{4x} \)
\( \frac{\pi}{2}(d_1 + d_2) + 2x + \frac{(d_1 + d_2)^2}{4x} \)
Correct answer
\( \frac{\pi}{2}(d_1 - d_2) + 2x + \frac{(d_1 + d_2)^2}{4x} \)
Calculate the belt speed that results in maximum power, given a maximum tension of 2500 N and a belt mass of 0.9 kg/m.
21.4 m/s
22.5 m/s
30.4 m/s
20.4 m/s
Correct answer
21.4 m/s
In a vapor absorption refrigeration system, the function of the absorber is to____.
Vaporize the refrigerant
Separate refrigerant from absorbent
Absorb refrigerant vapor into the absorbent
Increase refrigerant pressure
Correct answer
Vaporize the refrigerant
In a simple vapour compression cycle, the throttling process is assumed to be_______.
isothermal
isentropic
isochoric
isenthalpic
Correct answer
isothermal