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=n

_{1}+n

_{2}-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: P

_{max}= \(\frac{W}{2πr[r0-ri]} = \frac{4000}{2*3.14*0.05[0.05]}\) = 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/cm^{2}. 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 = ημWR

_{eff}

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 = ημW

_{act}R

_{eff}

W

_{act}= \(\frac{57*2}{4*0.1*0.1}\) = 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+R_{eff}

b) T = η – μ – W – R_{eff}

c) T = ημWR_{eff}

d) T = 1 – (ημWR_{eff})

View Answer

Explanation: W = P * π (r

_{0}

^{2}-r

_{i}

^{2})

T = \(∫_{ri}^{r0}\)dT = \(∫_{ri}^{r0}\)μP2πr

^{2}dr

T = \(\frac{2}{3}\) μW\([\frac{r0^3-ri^3}{r0^2-ri^2}] \)

T = ημWR

_{eff}

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: P

_{min}= \(\frac{W}{2πr[r0-ri]} = \frac{4000}{2*3.14*0.1[0.05]}\) = 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.**

To practice basic questions and answers on all areas of Farm Machinery, __ here is complete set of 1000+ Multiple Choice Questions and Answers__.

**Related Posts:**

- Practice Agricultural Engineering MCQs
- Apply for Agricultural Engineering Internship
- Check Agricultural Engineering Books
- Check Farm Machinery Books