Chapter 6 Flashcards
Closed circuit cooling systems incorporate:
A) Mechanical coolers
B) A raw-water supply which passes through the engine
C) A check valve
D) An aluminum coil
E) A heat exchanger
E
The piston used on a diesel engine are commonly made of ____________ or ____________.
A) Aluminum alloy, Carbon steel
B) Stainless steel, Carbon steel
C) Stainless steel, Cast iron
D) Stainless steel, Aluminum alloy
E) Aluminum alloy, Cast iron
E
Diesel piston crowns are usually:
A) Convex
B) Concave
C) Flat
D) Contoured
E) None of the above
B
The purpose of the coil in a battery ignition system is to:
A) To protect the resistor
B) Decrease the voltage to the plugs
C) To interrupt the primary current quickly
D) Prevent an arc across points
E) Increase the voltage to the plugs
E
In the turbo charger:
A) The air is cooled after the centrifugal blower to increase the density of the air
B) The air is cooled before entering the turbo charger to increase the density
C) The exhaust gases are cooled before entering the turbine
D) The air is cooled after the centrifugal blower to decrease the density of the air
E) The exhaust gases drive the centrifugal blower which drives the gas turbine
A
In the digital type of monitoring and control system for a large diesel engine, __________ is used to take input from the engine sensors.
A) An I.C.M.
B) A G.P.S.
C) A T.C.M.
D) An E.C.M.
E) A D.C.M.
D
A two-stroke cycle diesel engine:
A) Has difficulty removing exhaust gas from the cylinder
B) Always uses scavenging air
C) Always has valves
D) Is always of a uni-flow type of action
E) Requires oil mixed in the air for lubrication
A
In a closed-cooling system for an internal combustion engine, the:
A) Pump is on the high water temperature side of the engine
B) Pump is on the low water temperature side of the engine
C) Expansion tank is on the pump discharge
D) Cooling water is circulated intermittently
E) None of the above
B
If possible, an industrial sized diesel engine should start-up with __________ load, until normal operating temperature has been reached.
A) Full
B) Medium
C) High
D) Extra
E) No
E
A magneto ignition system:
A) Does not require a condenser
B) Produces a hotter spark at high speeds
C) Does not require a coil
D) Does not require points
E) Produces AC power
B
Connecting rods are hollow bored to convey lubricating oil to the:
A) Cylinder walls
B) Camshaft
C) Gudgeon pins
D) Pistons
E) Pistons skirt
C
When using compressed air to the cylinders to start a large diesel engine, the high pressure air is:
A) Supplied from the supercharger
B) Used for combustion
C) Applied to only a few cylinders
D) Applied to all of the cylinders
E) Used for scavenging
C
Diesel engines frequently employ extra cooling for the pistons by:
1. Circulating oil through passages to the piston
2. Spraying oil on the underside of the piston
3. Increasing the air flow in the cylinder water jackets
4. Decreasing the temperature of the fuel
A) 2, 4
B) 2, 3
C) 1, 2
D) 1, 2, 4
E) 1, 3
C
A typical lubrication system for a medium sized diesel engine is a:
A) Return circulation
B) Splash feed
C) Spray feed
D) Natural feed
E) Forced feed
E
The four-cycle engine is lubricated by thoroughly mixing a measured quantity of lubricating oil with the gasoline.
A) True
B) False
B
