Deck 18: Turbochargers and Superchargers

Question 1

The turbine wheel and shaft assembled with the compressor wheel comprise the ____.

A) turbo housing
B) rotor
C) splitter blade wheel
D) radial wheel

Answer 1

B

Question 2

What is the area between the parallel walls of the compressor cover and bearing housing where the air leaves the wheel?

A) the inducer
B) the spool
C) the volute
D) the diffuser

Answer 2

D

Question 3

Because cast iron heads dissipate heat better than aluminum, they are the head of choice for use with a supercharger or turbocharger.

Answer 3

True

Question 4

What is turbo lag?

Question 5

An engine with a turbocharger is a normally aspirated engine.

Question 6

Types of dynamic superchargers are being discussed. Technician A says the pressure wave is used mostly for two-stroke diesels. Technician B says a centrifugal supercharger is is crankshaft driven, rather than exhaust driven. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 7

Turbochargers are driven by _____.

A) belt
B) coolant flow
C) exhaust flow
D) electric

Question 8

What causes the condition known as turbo surge?

Question 9

Turbo damage by a foreign object is being discussed. Technician A says to look at the valves to determine from which direction the damage came. Technician B says compressor wheel damage results from objects entering the intake stream. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 10

The maximum flow capacity of a turbo compressor is called "choke."

Question 11

What are two common turbo scroll designs?

Question 12

A properly working supercharger will increase the density of the air in the cylinder.

Question 13

On carbureted engines, a _____ supercharger system pressurizes the air cleaner above the carburetor or fuel injection system.

A) flow-through
B) blow-through
C) draw-through
D) pumped-through

Question 14

What characterizes a positive displacement pump?

Question 15

All of these are dynamic superchargers EXCEPT _____.

A) centrifugal
B) positive displacement
C) axial flow
D) pressure wave

Question 16

Technician A says boost differential occurs when pressure is higher in either the turbine or the manifold. Technician B says negative differential is best for performance. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technicians

Question 17

Technician A says a fixed geometry turbocharger requires pressure relief because it operates over a wide rpm band. Technician B says a wastegate is commonly used to control the speed of the turbine in automobile engines. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 18

An internal wastegate is plumbed into the exhaust manifold.

Question 19

Technician A says following turbo use, turbo bearings cool quickly when the engine is shut off. Technician B says synthetic oil burns at a lower temperature so it is the oil of choice for use with a turbocharger. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 20

What is an aftercooler?