This set of Basic Farm Machinery Questions and Answers focuses on “Farm Tractor – Clutch and Fluid Coupling – 2”.
1. Multi plate clutch, when coolant is required, is also known as ______
a) Dry Clutch
b) Wet Clutch
c) Field Clutch
d) Dog Clutch
View Answer
Explanation: During relative motion due to engagement power loss occurs causing heat generation so coolant is required so multi plate clutch is also known as wet clutch.
2. A multi disc clutch has 4 steel discs and 3 bronze disc. The outside and inside diameter of contact surfaces are 250 mm and 180 mm respectively. The coefficient of friction is 0.3 and axial force is 400 N assuming uniform wear. The power in kw that clutch can transmit at 1000 rpm is ______
a) 4.05 KW
b) 16.20 KW
c) 8.10 KW
d) 32.40 KW
View Answer
Explanation: n=n1+n2-1 = 6
T = 154.8/2 = 77.4 Nm
P = \(\frac{2πNT}{60} = \frac{2*3.14*1000*77.4}{60}\) = 8.10 KW
3. Determine the maximum pressure in a plate when axial force is 4 KN. The radius of contact surface is 50 mm outside radius is 100 mm.
a) 0.255 N/mm
b) 0.319 N/mm
c) 0.248 N/mm
d) 0.303 N/mm
View Answer
Explanation: Pmax = \(\frac{W}{2πr[r0-ri]} = \frac{4000}{2*3.14*0.05[0.05]}\) = 0.255 N/mm
4. A multiple disc clutch, steel on bronze is to transmit 6 HP at 750 rpm. The inner radius of contact is 4cm and outer radius of contact is 7 cm. Coefficient of friction is 0.1 and the average allowable pressure is 3.5 kgf/cm2. Find the actual axial force required.
a) 2335.09 N
b) 2590.90 N
c) 1999.76 N
d) 2143.65 N
View Answer
Explanation:Explanation: P = \(\frac{2πNT}{60} \)
T = \(\frac{6*746*60}{6.28*750}\)=57 Nm
T = ημWReff
ηW = 2*5181.81
3.5 * 9.8*10^4 = \(\frac{W}{π[49-16]*10^{-4}} \)
W = 3554.16
N = 2.91
Actual axial force
T = ημWactReff
Wact = \(\frac{57*2}{4*0.1*0.1}\) = 2590.90 N
5. Which displacement can be achieved by toothed type clutch?
a) Positive displacement
b) Negative displacement
c) Neutral displacement
d) Divisional displacement
View Answer
Explanation: Positive displacement can be achieved by toothed type gear because when it is engaged there will be no sliding occurring between the contact surface.
6. What is the uniform pressure theory for new clutch plated?
a) T = η+μ+ W+Reff
b) T = η – μ – W – Reff
c) T = ημWReff
d) T = 1 – (ημWReff)
View Answer
Explanation: W = P * π (r02-ri2)
T = \(∫_{ri}^{r0}\)dT = \(∫_{ri}^{r0}\)μP2πr2dr
T = \(\frac{2}{3}\) μW\([\frac{r0^3-ri^3}{r0^2-ri^2}] \)
T = ημWReff
7. In single plate clutch there is no need of coolant, hence it is also known as ______
a) Wet clutch
b) Damp clutch
c) Dog clutch
d) Dry clutch
View Answer
Explanation: In short plate clutch, there is no need of coolant so it is also known as dry clutch. Coolant is not used because it reduces the coefficient of friction and as a result torque transmission is decreased.
8. Determine the minimum and average pressure in a plate when axial force is 4 KN. The radius of contact surface is 50 mm outside radius is 100 mm.
a) 0.127 N/mm; 0.17 N/mm
b) 0.186 N/mm; 0.10 N/mm
c) 0.183 N/mm; 0.18 N/mm
d) 0.120 N/mm; 0.72 N/mm
View Answer
Explanation:
Explanation: Pmin = \(\frac{W}{2πr[r0-ri]} = \frac{4000}{2*3.14*0.1[0.05]}\) = 0.127 N/mm
Average pressure, P = \(\frac{W}{\pi[r0^2-ri^2]} = \frac{4000}{π[0.1^2-0.05^2]}\) = 0.17 N/mm
Sanfoundry Global Education & Learning Series – Farm Machinery.
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