Tractor Tech Practice Quiz 3

For speed reduction in a gear set:

• 51. a larger gear drives a smaller driven gear

• 52. a smaller gear drives a larger driven gear

The purpose(s) of engine oil is/are to:

• help seal the piston rings to the cylinder walls

• reduce friction between moving parts

• heat moving parts

The advantage(s) of using chain drives is/are:

• chain drives are efficient and do not slip

• chains keep a fixed ratio without slipping

• operate with a high degree of misalignment

• chain drives can carry heavier loads than belts

• chain drives are fairly noisy

The ability of belts to transmit power depends on:

• 61. tension holding the belt to the pulleys

• 62. friction between belt and pulleys

• 63. arc of contact between belt and pulleys

• 64. speed of belt

• 65. length of belt.

Possible failure(s) of an armature is/are due to:

• 66. closed armature cells

• 67. shorted armature coils

• 68. grounded armature coils

• 69. open armature coils

• 70. dirty or worn commutator bars

When cleaning any residue from the faces of breaker points when servicing spark ignition systems, you may use:

• 71. fine emery cloth

• 72. sand paper

• 73. lint-free cloth and lighter fluid

When storing a crankshaft, it can be:

• 74. secured vertically

• 75. secured horizontally on a flat surface

• 76. supported by V-blocks at main journals in horizontal position

• 77. supported only by the ends in a horizontal position

The diesel fuel-injection system must do the following:

• 78. supply the correct amount of fuel

• 79. atomize the fuel

• 80. remove sulfur from the fuel

• 81. premix bio-diesel with #2 diesel fuel

• 82. time the fuel delivery

Diesel fuel injection nozzles are responsible for:

• 83. atomizing the fuel for better combustion

• 84. timing the ignition of the fuel/air ratio

• 85. governing the engine speed

• 86. spreading the fuel spray to fully mix it with the air

When diagnosing an electronic system on newer agricultural equipment:

• 87. it is desirable to use a multi-meter with a lower impedance or resistance rating

• 88. connect a voltmeter in series with other components on an energized circuit to determine voltage

• 89. an Open-Circuit malfunction produces the same test results as a Short Circuit malfunction

• 90. a High-Resistance malfunction has similar characteristics and test results to an Open-Circuit malfunction even though the circuit is complete

• 91. bulb-type test lights can be used interchangeably with voltmeters to determine the amount of voltage present