Question 1

What altitude from the Earth's equator would define a geosynchronous orbit?&#10;A) 56,700 miles (91,250 km)&#10;B) 35,900 miles (57,775 km)&#10;C) 22,300 miles (35,888 km)&#10;D) 160 miles (257 km)

Accepted Answer

A geosynchronous orbit, specifically a geostationary orbit, is achieved at an altitude of approximately 22,300 miles (35,888 km) above the Earth's equator. This allows a satellite to match the Earth's rotation and remain over the same geographic location.

Question 2

Which of the following best describes the role of voltage in an electrical circuit?&#10;A) flow&#10;B) resistance to flow&#10;C) work&#10;D) pressure

Accepted Answer

Voltage in an electrical circuit is analogous to pressure. It is the force that pushes electric current through a conductor, much like pressure pushes water through a pipe.

Question 3

Which of the following is a measure of capacitance?&#10;A) watts&#10;B) coulombs&#10;C) ohms&#10;D) farads

Accepted Answer

Farads is the unit of capacitance, which measures a capacitor's ability to store an electric charge.

Question 4

What is the insulating material in a capacitor known as?&#10;A) semiconductor&#10;B) dielectric&#10;C) mica&#10;D) substrate

Accepted Answer

The insulating material in a capacitor is known as a dielectric. It is the material between the capacitor's plates that prevents electrical current from flowing directly between the plates, while allowing energy to be stored in the form of an electric field.

Question 5

What number of different data possibilities can be expressed in one byte of data?&#10;A) 8&#10;B) 16&#10;C) 64&#10;D) 256

Accepted Answer

A byte consists of 8 bits, and each bit has 2 possible states (0 or 1). Therefore, the number of different data possibilities in one byte is 2^8 = 256.

Question 6

What type of actuators are used in electrohydraulic injectors (EHIs)?&#10;A) solenoid only&#10;B) piezoelectric only&#10;C) both solenoid and piezoelectric&#10;D) neither solenoid or piezoelectric

Accepted Answer

Electrohydraulic injectors (EHIs) can use both solenoid and piezoelectric actuators to control the injection of fuel into an engine's combustion chamber. Solenoid actuators use electromagnetic forces, while piezoelectric actuators use the piezoelectric effect to create movement.

Question 7

Which of the following measurements would be a likely specification for crankshaft endplay in a heavy-duty highway diesel engine?&#10;A) 0.002 - 0.003 inches&#10;B) 0.004 - 0.006 inches&#10;C) 0.008 - 0.012 inches&#10;D) 0.012 - 0.018 inches

Accepted Answer

Crankshaft endplay in heavy-duty diesel engines typically falls within the range of 0.008 to 0.012 inches, allowing for necessary thermal expansion and movement without excessive wear.

Question 8

Work = ____________________ &#215; ____________________

Accepted Answer

The answer of Work = ____________________ &#215; ____________________...

Question 9

Convert 10 lb.ft to Newton meters&#10;A) 1.356&#10;B) 2.623&#10;C) 13.56&#10;D) 26.23

Accepted Answer

1 pound-foot is equal to approximately 1.356 Newton-meters. Therefore, 10 lb.ft is equal to 10 * 1.356 = 13.56 Nm.

Deck 1: Medium Heavy Duty Truck Engines