Deck 17: Engine Size and Measurements

Question 1

Heat is measured in British thermal units (Btu).

Answer 1

True

Question 2

In designing an engine, which of the following is LEAST-Likely to optimize horsepower and torque curves?

A)Cylinder
B)Camshaft
C)Exhaust system
D)Intake manifold

Answer 2

A

Question 3

All of the following statements are correct EXCEPT:

A)a higher compression ratio can increase an engine's power and fuel economy.
B)compression ratio has an effect on the amount of power an engine can produce by increasing the thermal efficiency of the engine.
C)compression pressure is the amount of pressure made by the piston moving up in the cylinder in pounds per square inch (psi) or kilopascals (kPa).
D)higher compression engines produce less exhaust emissions.

Answer 3

D

Question 4

Cylinder ____________________ in automobile engines usually range from about 3.5" to 4".

Question 5

The MOST-Likely product of a body's mass and speed is:

A)inertia
B)power
C)momentum
D)energy

Question 6

The compression ratio determines how much the air and fuel are compressed on the compression stroke.

Question 7

The ____ is the distance that the piston moves from TDC to BDC.

A)oversquare
B)crank throw
C)foot-pound
D)piston stroke

Question 8

A simple dynamometer that uses friction is called a(n) ____________________.

Question 9

____ is the measurement of an engine's ability to perform work in a specified time.

A)Energy
B)Horsepower
C)Momentum
D)Inertia

Question 10

While having a discussion, Technician A says that engine displacement is determined by multiplying the cylinder displacement by the number of cylinders. Technician B says that it is determined by multiplying the swept volume of the cylinder by the number of cylinders. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 11

While having a discussion about torque, Technician A says that the force of 1 pound exerted at a distance of 1 foot from the center of a crankshaft results in 2 foot-pound of torque. Technician B says it results in 1 foot-pound of torque. Who is correct?

A)A only
B)B only
C)Neither A nor B
D)Both A and B

Question 12

When an engine has a cylinder bore that is larger than its stroke, this is called a(n) ____________________ engine.

Question 13

An engine's size is determined by the volume of air that its pistons displace in the cylinders.

Question 14

All of the following are measurements of engine horsepower EXCEPT:

A)brake horsepower
B)indicated horsepower
C)frictional horsepower
D)dyno horsepower

Question 15

In an engine, the amount of turning force exerted by the crankshaft is MOST-Likely referred to as:

A)energy
B)inertia
C)torque
D)power

Question 16

Which of the following statements is LEAST-Likely to be correct?

A)A chassis dyno measures horsepower available at the vehicle's drive wheels.
B)Road horsepower is always greater than brake horsepower.
C)On a chassis dynamometer, one roller is attached to the power absorption unit and the other is an idle roller.
D)Chassis dynamometers can be driven by the wheels or connected directly to the hubs.

Question 17

Engine dynamometers are used in emission control testing programs because testing of oxides of nitrogen can only be done when the engine is under load.

Question 18

Inertia is the ability to make power and is defined as the tendency of force to rotate a body on which it acts.

Question 19

____________________ is defined as any action that changes, or tends to change, the position of something.

Question 20

Piston or cylinder ____________________ refers to the volume that the piston displaces in the cylinder as it moves from TDC to BDC.

Question 21

What are the characteristics of oversquare and undersquare engines?

Question 22

What is the difference between net horsepower and gross horsepower?

Question 23

What is the difference between energy and inertia?

Question 24

What is the difference between horsepower and torque?

Question 25

Briefly define the terms volumetric efficiency and thermal efficiency.