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Sample Practice Test Questions
The fuel injector is regulated by the __________ which is the main computer that controls engine and transmission functions.
powertrain control module
The fuel injector sprays fuel into the air stream that's being fed into the cylinder head via the intake valve. The timing and amount of fuel are regulated by the powertrain control module (PCM) which is the main computer that controls engine and transmission functions.
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the slower electron flow will be
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
Sound travels fastest through which of the following media?
metal
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).
Simplify 7a x 6b.
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
7a x 6b = (7 x 6) (a x b) = 42ab
What is a micrometer used for?
measuring the diameter of cylindrical objects with high precision
Micrometers provide accuracy to the thousandths of an inch and come in outside and inside varieties. An outside micrometer is used to measure outside thickness, such as the diameter of a bolt, while an inside micrometer is used to measure the inside dimension of an object, such as the diameter of the hole of a nut or the width of a channel.
If all of a roofing company's 6 workers are required to staff 3 roofing crews, how many workers need to be added during the busy season in order to send 7 complete crews out on jobs?
In order to find how many additional workers are needed to staff the extra crews you first need to calculate how many workers are on a crew. There are 6 workers at the company now and that's enough to staff 3 crews so there are \( \frac{6}{3} \) = 2 workers on a crew. 7 crews are needed for the busy season which, at 2 workers per crew, means that the roofing company will need 7 x 2 = 14 total workers to staff the crews during the busy season. The company already employs 6 workers so they need to add 14 - 6 = 8 new staff for the busy season.
Find the value of b:
5b + z = -1
-2b - 3z = -3
You need to find the value of b so solve the first equation in terms of z:
5b + z = -1
z = -1 - 5b
then substitute the result (-1 - 5b) into the second equation:
-2b - 3(-1 - 5b) = -3
-2b + (-3 x -1) + (-3 x -5b) = -3
-2b + 3 + 15b = -3
-2b + 15b = -3 - 3
13b = -6
b = \( \frac{-6}{13} \)
b = -\(\frac{6}{13}\)