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DESIGN AND TESTING BELONIO > Direct Drive > Flashcards

Direct Drive Flashcards

1
Q

In direct drive, there is _______ in the speed of the driver
and driven parts of the machine.

A

no change

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1
Q

Transmission of power (torque and speed) from the driver
to the driven part of the machine is done without any
driven wheel such as pulley, sprocket, or gear.

A

Direct drive

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2
Q

Can be considered as more efficient

as compared with the other transmission systems.

A

Power Transmission systems

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3
Q

Characteristics of Direct Drive

A

• It is an efficient method of transmitting power for the reason
that there is minimal losses in the drive train as compared
with the other methods.
• Design is simple with very few moving parts.
• There is a need for a special type of driver machine in order
to provide high-torque output when using low rpm driven
machine.
• It needs a more precise control mechanism.

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4
Q

Applications of Direct Drive

A

• Transmitting power from tractor PTO drive to rotavator,
post-hole digger, power harrows, etc.
• Transmitting power from the engine to the rear wheel
axle of self-propelled farm machines.
• Driving stand-by generator when using internal
combustion engine.
• Driving fans, blowers, and pumps.
• Others

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5
Q

Coupling connecting rigid rods with axes inclined to each other and
is the commonly used shaft that transmits rotary motion.

A

Universal joint or Cross joint

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6
Q

It allows one or more rotating shaft to be linked together

allowing the transmission of torque and/or rotary motion.

A

Universal joints or Cross joint

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7
Q

It is commonly used for misaligned shaft which can be

amplified by the use of multiple universal joints.

A

Universal Joints or Cross joint

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8
Q

Used to reduce transmission of shock
loads from one shaft to another. It also allows to slip when
overloaded

A

Coupling Transmission

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9
Q

Power transmission components used to couple shafts of various mechanical devices, and to compensate for shaft misalignment, reducing stress to shafts and bearings

A

Drive Coupling

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10
Q

Types of Drive Coupling

A

a. Jaw coupling
b. Sleeve coupling
c. Tire coupling
d. Disc coupling
e. Diaphragm coupling
f. Gear Coupling
g. Grid coupling
h. Roller-chain coupling

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11
Q

It is usually used to transmit torque from one

shaft to another when the two shafts are slightly misaligned.

A

Flexible Coupling

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12
Q

a device for transmitting rotary motion between
two objects which are not fixed relative to one another. It
consists of a rotating wire rope or coil which is flexible but has
some torsional stiffness.

A

Flexible Shaft

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13
Q 
1. Device used to transmit power by 
connecting shafts together.
a. Flexible coupling
b. Rigid coupling
c. All of the above 
d. None of the above.
A

C. All of the above

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14
Q
  1. What transmission drive would you
    recommend for the design of a
    manually-operated back-pack power
    harvester?
A

C. Flexible Shafting

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15
Q
  1. If a drive shaft of the machine is in
    line with the drive shaft of the engine,
    what transmission drive would you
    recommend?
A

a. coupler

16
Q 
4. Device used to connect two shafts 
together for the purpose of 
transmitting power permitting some 
degree of misalignment, end 
movement, or both.
A

coupler

17
Q 
5. Hydrodynamic device used to 
transmit rotating mechanical power of 
a tractor with the use of a fluid with 
pump that is connected to the 
flywheel of the engine and a turbine to 
the input shaft of the transmission 
gear.
A

C. fluid coupling

18
Q
  1. Gripping device placed between
    the power source and the machine
    to be driven.
A

Clutch

19
Q
  1. Type of clutch used to drive a
    machine element in only one
    direction.
A

Overrunning Clutch

20
Q
  1. Type of clutch that limits the
    amount of torque or power
    transmitted to the driven member
    through the shaft.
A

Slip clutch

21
Q 
Mechanism of a tractor which 
enables the rotary motion of one 
shaft is transmitted to the second 
shaft whose axis is coincident with 
that of the first.
A

clutch

22
Q

Clutch of the tractor is located

____ the engine and the gear box.

A

between

23
Q

Clutch is disengaged when

____ .

A

a. starting the engine
b. shifting the gears
c. idling the engine

24
Q

When a machine is driven
directly from the shaft of a power
source, the power is transmitted
using ____.

A

Direct drive

25
Q 
If the shaft of an engine rotates 
at the same speed with the shaft of 
the driven machine on the same 
axis, the transmission system is 
\_\_\_\_.
A

Direct coupled drive

26
Q 
A water pumping plant is 
designed to deliver water from a 
river to the farm. The river is 6m 
high and 10m away from the farm. 
The pump needs to be installed at
the mid point between the river and 
the farm; while, the engine is to be 
installed at the river bank. As an 
Agricultural Engineer, what drive 
system would you recommend in 
the design of the plant?
A

Universal Joint

27
Q

The following factors
is considered in the selection of
coupling

A

a. Type of coupling
b. Size of coupling
c. Material
d. Dynamic balance

28
Q

Type of couplings that can

accommodate almost no alignment.

A

Rigid Coupling

29
Q

Type of coupling that offers the
advantage of torsional vibration
dampening. It accommodates large
torque and small misalignment

A

Jaw coupling

30
Q

Type of coupling used for large
shafts (over 2in. in diameter), very
high torques, and rough applications.

A

Chain Coupling

31
Q

Type of coupling used in
application that can accommodate
large angular misalignment.

A

Universal Joint

32
Q 
Power transmission device used 
to deliver misaligned shaft.
a. Gears
b. Sprocket and chain
c. Universal joint 
d. All of the above
A

C. Universal Joints

33
Q

Device usually used to connect

two shafts in a direct-drive system.

A

Coupler

DESIGN AND TESTING BELONIO (3 decks)

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