Power Engineering 3B2 ch6 (Internal Combustion Engines)
Questions With Complete Solutions
In the common rail system used for injection of fuel into the
diesel cylinder:
a. The fuel is injected into the cylinder by the fuel pump
b. The fuel is injected into the cylinder by the injector
c. The system requires two pumps
d. The system does not require a return from the injector
e. The excess fuel returns directly to the inlet of the pump
B
The solid injection method includes:
1) Individual pump system
2) Distributor system
3) Common rail system
4) Air injection system
The air injection system supplies air to the cylinder before
compression.
a. 1, 2
b. 2, 3
c. 3, 4
d. 1, 2, 3
e. 1, 3, 4
D
,In the common rail system of fuel injection, the fuel is pumped
from the tank by a ________________________.
a. low pressure pump to the filter
b. low pressure pump to the distributor
c. high pressure pump to the injector
d. high pressure pump to the distributor
e. low pressure pump to the injector
E
Superchargers are _______________________________.
a. used to force more air-fuel mixture into the cylinder of a
diesel engine
b. used to force more air only into the cylinder of a gasoline
engine
c. are usually of the rotary screw or the centrifugal type
d. used to increase power output
e. are never used on gasoline engines
D
In the turbo charger:
a. The exhaust gases are cooled before entering the turbine.
b. The air is cooled before it enters the turbo charger to increase
its' density.
c. The air is cooled after the centrifugal blower to decrease the
density of the air.
d. The air is cooled after the centrifugal blower to increase the
,density of the air.
e. The exhaust gases drive the centrifugal blower which drives
the gas turbine.
D
The pressure at the discharge of a supercharger may be as high
as__________.
a. 100 kPa
b. 120 kPa
c. 10 kPa
d. 30 kPa
e. 140 kPa
E
Diesel engines frequently employ extra cooling for the pistons
by?
1) Circulating oil through passages in the piston
2) Spraying oil on the underside of the piston
3) Increasing the water flow in the cylinder water jackets
4) Decreasing the temperature of the cooling water
a. 1, 2
b. 1, 3
c. 2, 3
d. 2, 4
e. 1, 2, 4
A
, In a closed-cooling system for an internal combustion engine:
a. The pump is on the high water temperature side of the engine.
b. The pump is on the low water temperature side of the engine.
c. The expansion tank is on the water supply side of the engine.
d. The cooling water is circulated intermittently.
e. None of the above
B
Closed circuit cooling systems incorporate____________.
a. a heat exchanger
b. a raw-water supply which passes through the engine
c. a check valve
d. an aluminum coil
e. mechanical coolers
A
Lubrication of the internal combustion engine is necessary in
order to:
1) Reduce friction between moving parts
2) Reduce wear of parts
3) Provide cooling of engine parts
4) Keep parts clean
5) Increase the life of the valves
6) Seal between pistons and cylinder walls
a. 1, 2, 3, 5
b. 1, 2, 3, 4, 5, 6
Questions With Complete Solutions
In the common rail system used for injection of fuel into the
diesel cylinder:
a. The fuel is injected into the cylinder by the fuel pump
b. The fuel is injected into the cylinder by the injector
c. The system requires two pumps
d. The system does not require a return from the injector
e. The excess fuel returns directly to the inlet of the pump
B
The solid injection method includes:
1) Individual pump system
2) Distributor system
3) Common rail system
4) Air injection system
The air injection system supplies air to the cylinder before
compression.
a. 1, 2
b. 2, 3
c. 3, 4
d. 1, 2, 3
e. 1, 3, 4
D
,In the common rail system of fuel injection, the fuel is pumped
from the tank by a ________________________.
a. low pressure pump to the filter
b. low pressure pump to the distributor
c. high pressure pump to the injector
d. high pressure pump to the distributor
e. low pressure pump to the injector
E
Superchargers are _______________________________.
a. used to force more air-fuel mixture into the cylinder of a
diesel engine
b. used to force more air only into the cylinder of a gasoline
engine
c. are usually of the rotary screw or the centrifugal type
d. used to increase power output
e. are never used on gasoline engines
D
In the turbo charger:
a. The exhaust gases are cooled before entering the turbine.
b. The air is cooled before it enters the turbo charger to increase
its' density.
c. The air is cooled after the centrifugal blower to decrease the
density of the air.
d. The air is cooled after the centrifugal blower to increase the
,density of the air.
e. The exhaust gases drive the centrifugal blower which drives
the gas turbine.
D
The pressure at the discharge of a supercharger may be as high
as__________.
a. 100 kPa
b. 120 kPa
c. 10 kPa
d. 30 kPa
e. 140 kPa
E
Diesel engines frequently employ extra cooling for the pistons
by?
1) Circulating oil through passages in the piston
2) Spraying oil on the underside of the piston
3) Increasing the water flow in the cylinder water jackets
4) Decreasing the temperature of the cooling water
a. 1, 2
b. 1, 3
c. 2, 3
d. 2, 4
e. 1, 2, 4
A
, In a closed-cooling system for an internal combustion engine:
a. The pump is on the high water temperature side of the engine.
b. The pump is on the low water temperature side of the engine.
c. The expansion tank is on the water supply side of the engine.
d. The cooling water is circulated intermittently.
e. None of the above
B
Closed circuit cooling systems incorporate____________.
a. a heat exchanger
b. a raw-water supply which passes through the engine
c. a check valve
d. an aluminum coil
e. mechanical coolers
A
Lubrication of the internal combustion engine is necessary in
order to:
1) Reduce friction between moving parts
2) Reduce wear of parts
3) Provide cooling of engine parts
4) Keep parts clean
5) Increase the life of the valves
6) Seal between pistons and cylinder walls
a. 1, 2, 3, 5
b. 1, 2, 3, 4, 5, 6
