# Farm Machinery Questions and Answers – Plant Protection Equipments – Sprayers – 1

This set of Farm Machinery Multiple Choice Questions & Answers (MCQs) focuses on “Plant Protection Equipments – Sprayers – 1”.

1. Which sprayers are operated usually with Internal Combustion engines?
a) Power sprayer
b) Hydraulic sprayer
c) Commercial sprayer
d) Foot sprayer

Explanation: Power sprayers are operated with Internal combustion engines. The prime mover capacity varies from 1 to 5 hp.

2. What is the pressure at which Power sprayers are operated?
a) 68-103 kg/cm2
b) 20-55 kg/cm2
c) 106-141 kg/cm2
d) 120-155 kg/cm2

Explanation: The pressure pump, in the Power sprayer, is operated by a small power unit ensuring a constant steady pressure from 20 to 55 kg/cm2. These machines are usually portable type.

3. What is the rotating speed of an agitator in a power sprayer?
a) 400-500 rev/min
b) 900-1000 rev/min
c) 600-700 rev/min
d) 100-200 rev/min

Explanation: Agitators are needed to agitate the liquid of the tank. Horizontal shaft may be used with flat blades rotating at about 100-200 rev/min. Paddle tip speeds in excess of 2.5 m/sec may cause foaming.

4. In which nozzle narrow elliptical spray pattern is formed?
a) Hollow cone nozzle
b) Solid cone nozzle
c) Fan type nozzle
d) Nozzle boss

Explanation: Fan nozzle is a nozzle which forms narrow elliptical spray pattern. In this type, the liquid is forced to come out as a flat fan shaped sheet which is then broken into droplets.

5. The operating pressure of fan nozzle, which is undesirable is _____
a) 1.2 kg/cm2
b) 1.5 kg/cm2
c) 9 kg/cm2
d) 5.9 kg/cm2

Explanation: Nozzles on field sprayers have spray angles of 60° to 90° but high-pressure nozzles have smaller angles. Operating pressure below 1.5 kg/cm2 is undesirable the nozzle does not work satisfactorily.
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6. Which nozzle covers the entire area at small range?
a) Solid cone nozzle
b) Fan nozzle
c) Hollow cone
d) Nozzle tip

Explanation: Solid cone nozzle covers the entire area at small range. The construction is similar to hollow cone nozzle with the addition of an internal jet which strikes the rotating liquid just within the orifice of discharge.

7. Which part of power sprayer is used to prevent corrosion?
a) Agitator
b) Strainer
c) Prime mover
d) Tank

Explanation: Steel tank is widely used to prevent corrosion. Plastic tanks are also getting popular due to freedom from corrosion and ease of moulding into smooth shapes.

8. Which part of power sprayer is used to break the liquid into desired spray and deliver to plants?
a) Boom
b) Nozzle
c) Strainer
d) Pressure gauge

Explanation: Nozzle is used to break the liquid into desired spray and deliver to plants. The body of the nozzle and the screw cap hold all the other parts in place. The disc has a number of holes including one hole in the centre and they are usually numbered from one to ten to denote the diameter of the hole.

9. What is rate of the spinning disc, attached to the motor, in Ultra low volume sprayer?
a) 4000-9000
b) 1000-3000
c) 750-1000
d) 10000-15000

Explanation: The ultra-low volume sprayer has a motor powered by 6 to 122 V battery. To the motor is attached a spinning disc, having grooves or teeth and rotates at a very high revolution per minute (4000-9000).

10. Who invented world’s first self-propelled sprayer?
a) Ray Hagie
b) Elon Musk
c) John Deere
d) Rachel Carson

Explanation: In 1947, Ray Hagie, founder of Hagie Manufacturing, invented the world’s first self-propelled sprayer.

11. Aldrin is the ________
a) inorganic compound
b) oil compound as spray material
c) organic compound as spray material
d) solution

Explanation: Aldrin is an organochlorine insecticide that was widely used until the 1990s, when it was banned in most countries. It is a colourless solid.

12. The tank capacity of hydro-pneumatic sprayers, is about ________
a) 1135.5 l
b) 2000 l
c) 750 l
d) 1000 l or less

Explanation: A hydro-pneumatics tank contains pressurized air and water. It does not have a bladder and air is in direct contact with the water. It delivers water within a selected pressure range so the well pump is not continuously running.

13. By using a knapsack sprayer, a man can spray over the area of about __________
a) 1 ha per day
b) 0.75 ha per day
c) 1.25 ha per day
d) 0.4 ha per day

Explanation: A sprayer consisting of handheld nozzle supplied from a pressurized reservoir that is carried on the back like a knapsack, used chiefly in spraying fungicides or insecticides.

14. Who invented duster?
a) H.D. Norman
b) C.E. Ramser
c) Susan Hibbard
d) W.H. Sleeper

Explanation: Susan Hibbard invented the feather duster in 1876. A feather duster is an implement used for cleaning. It consists of a wooden dowel handle and feathers from ostrich bird.

15. A tractor sprayer is fitted with 20 hollow cones nozzles to attain application rate of 200 l/hr. During the calibration test, the nozzle flow rate was found to be 1.25 l/min whereas, the rated nozzle flow rate was found to be 0.473 l/min was available at 275 kPa. If the nozzle produces droplets with volume median diameter 200 μm at 1 Mg Pascal, the droplet at the desire flow rate is?
a) 161 μm
b) 164 μm
c) 167 μm
d) 170 μm

Explanation: $$\frac{Q1}{Q2}=\sqrt{\frac{P1}{P2}}$$
$$\frac{0.473}{1.25}=\sqrt{\frac{275}{P2}}$$
P2=$$\frac{275*1.25*1.25}{0.473*0.473}$$ = 1920.57 kPa
$$\frac{VMD1}{VMD2} = (\frac{P1}{P2})^{\frac{1}{3}}$$
$$\frac{200}{VMD2} = (\frac{1920.57}{1000})^{\frac{1}{3}}$$
VMD2 = 161 μm.

Sanfoundry Global Education & Learning Series – Farm Machinery.

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