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DESIGN OF AGRICULTURAL MACHINERY - A.T. Belonio and D.A.H. Belonio > SHAFTS, KEYS, AND KEYWAYS > Flashcards

SHAFTS, KEYS, AND KEYWAYS Flashcards

1
Q

A machine element that transmits torque and power.

a. Pulley
b. Bearing
c. Shaft
d. None of the above

A

c. Shaft

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2
Q

The factor that affects the horsepower requirement of a shaft.

a. Torque
b. Rpm shaft
c. Peripheral velocity of shaft
d. All of the above

A

d. All of the above

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3
Q

*A shaft delivers 10 lbs at 10-cm crank radius. What is the torque delivered by the shaft? (Problem 1)

a. 40.54 kg-cm
b. 45.45 kg-cm
c. 54.54 kg-cm
d. None of the above

**If the said shaft rotates at 80 rpm, what is its power delivered ? (Problem 1)

a. 0.05 Hp
b. 0.06 hp
c. 0.07 hp
d. None of the above

A

b. 45.45 kg-cm

a. 0.05 Hp

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4
Q

If two shafts are perpendicular with each other, what type of drive system would you recommend?

a. Flat belt
b. V-belt
c. Sprocket and chain
d. All of the above

A

a. Flat belt

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5
Q

In a design of drive shaft assembly the weakest part should be the ____.

a. Shaft
b. Hub
c. Key
d. Keyway
e. None of the above

A

c. Key

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6
Q

Rule of thumb for the length of keyway based on the diameter of the shaft.

a. 1.5 the diameter
b. 2.0 the diameter
c. 2.5 the diameter
d. None of the above

A

a. 1.5 the diameter

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7
Q

A solid shaft delivers 1000 in.-lb torque at 800 rpm rotation, what shaft diameter would you recommend? Recommended design stress is 6,000 psi. (Problem 2)

a. 1 in.
b. 1.5 in.
c. 2 in.
d. None of the above

A

a. 1 in.

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8
Q

*What would you recommend for the biomass shredder’s shaft diameter if engine delivers a power is 10 hp in a shaft running at a speed of 1800 rpm? Consider a design stress for the shaft of 6000 psi (Problem 3)

a. 0.66 in.
b. 1.00 in.
c. 1.25 in.
d. None of the above

**What is the recommended size of the
shaft for the shredder above is ___.
(Problem 3)
a. ½ in.
b. ¾ in
c. 1 in
d. None of the above

A

a. 0.66 in.

b. ¾ in

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9
Q

A machine element used to fasten shaft pulleys and gear hubs together.

a. Bolt
b. Springs
c. Keys
d. None of the above

A

c. Keys

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10
Q

A grove that is placed on a shaft to prevent the pulley from slippage.

a. Keyway
b. Keyhole
c. Key
d. None of the above

A

a. Keyway

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11
Q

A type of key applicable for sliding type shaft and hub assembly.

a. Parallel key
b. Woodruff key
c. Taper key
d. All of the above

A

a. Parallel key

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12
Q

A type of key applicable for an assembly in which the hub is fastened to the shaft or an assembly in which the key is driven between the shaft and the hub.

a. Parallel key
b. Woodruff key
c. Taper key
d. All of the above

A

d. All of the above

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13
Q

Rule of thumb for the width of keyway based on the diameter of shaft.

a. ¼ the diameter
b. ½ the diameter
c. ¾ the diameter
d. None of the above

A

a. ¼ the diameter

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14
Q

Rule of thumb for the depth of keyway based on the diameter.

a. 1/8 the diameter
b. 1/4 the diameter
c. ½ the diameter
d. None of the above

A

a. 1/8 the diameter

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15
Q

The recommended key cross-section for shaft below 5.5 in. is ___.

a. square
b. rectangular
c. triangular
d. None of the above

A

a. square

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16
Q

The recommended key cross section for shaft above 5.5 in. is ___.

a. square
b. rectangular
c. triangular
d. None of the above

A

b. rectangular

17
Q

A shaft with varying diameter along its length.

a. Main shaft
b. Line shaft
c. Stepper shaft
d. None of the above

A

c. Stepper shaft

18
Q

The shaft diameter is 30 mm. As an Agricultural Engineer, what size of square keyway would you recommend?

a. 5 mm
b. 7.5 mm
c. 10 mm
d. 12.5
e. None of the above

A

b. 7.5 mm

19
Q

All rotating parts of agricultural machines, as prescribed in the PAE Standards, should be ___.

a. rigid
b. dynamically balanced
c. uniform in speed
d. None of the above

A

b. dynamically balanced

20
Q

*An axle of a power tiller was tested on a Prony-brake dynamometer. The force delivered at 1-m brake arm was 300 kg at 25 rpm speed. Determine the torque. (Problem 4)

a. 300 kg-m
b. 300 N-m
c. 300 ft-lb
d. None of the above

**What is the shaft power of the power tiller in Item above? (Problem 4)

a. 5.59 hp
b. 5.95 hp
c. 9.55 hp
d. None of the above

A

a. 300 kg-m

a. 5.59 hp

21
Q

*Compute the torque deliver by the solid shaft of a fluted mill rotating at 100-rpm speed and transmitting a 1.2-hp power. Assume a 6000-psi design stress for the shear. Consider that the shaft is subjected to torsion only. (Problem 5)

a. 576 in-lb
b. 657 in-lb
c. 756 in-lb
d. None of the above

**What is the diameter of the shaft
above? (Problem 5)

a. 0.3860 in.
b. 0.638 in.
b. 0.863 in.
c. None of the above

A

c. 756 in-lb

b. 0.863 in.

22
Q

*A solid steel shaft of a micro huller is needed to deliver 2.5 kW while rotating at 1200 rpm. Find the
torque and minimum diameter of the shaft if its allowable shear stress is 40 MN/m2. (Problem 6)

a. 19.89 N-m
b. 21.45 N-m
c. 24.54. N-m
d. None of the above

**What is the diameter of the shaft
above? (Problem 6)

a. 13.6 mm
b. 15.7 mm
c. 18.7 mm
d. None of the above

A

a. 19.89 N-m

a. 13.6 mm

23
Q

*Recommend a shaft size required for the main transmission shaft of a rice mill’s prime mover with the following specifications: Engine, Isuzu 8 PA; Hp rated, 225 Hp; and Engine Speed, 3600 rpm. Use 6,000-psi design stress for the shaft. (Problem 7)

a. 1.0 in.
b. 2.0 in.
c. 2.5 in.
d. None of the above

**What size of square key is needed for the shaft? (Problem 7)

a. ¼ in.
b. ½ in.
c. ¾ in.
d. None of the above

***What is the minimum length of key needed to be used for the shaft? (Problem 7)

a. 0.32 in.
b. 0.53 in.
c. 0.96 in.
d. None of the above

A

b. 2.0 in.

b. ½ in.

a. 0.32 in.

24
Q

Some disadvantages of keyway.

a. Increase unbalance in shaft
b. Shaft is weakened
c. Alternating load give a play and risk for breakage and fatigue.
d. All of the above
e. None of the above

A

d. All of the above

25
Q

Commonly used tool in removing hub from a shaft.

a. Hammer and cold chisel
b. Vise grip
c. Puller
d. None of the above

A

c. Puller

26
Q

Reasons why a pulley is difficult to remove from a shaft.

a. Rusted shaft
b. Fatigue failure
c. Deformed shaft
d. All of the above
e. None of the above

A

d. All of the above

DESIGN OF AGRICULTURAL MACHINERY - A.T. Belonio and D.A.H. Belonio (14 decks)

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