Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Asst Engineering UFIV > Motor > Flashcards

Motor Flashcards

1
Q

The highest pressure in a diesel engine cylinder normally occurs __________.

A

after TDC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

In a diesel engine, after ignition of the fuel occurs, but before the piston reaches TDC, there is little change in the cylinder __________.

A

volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which statement about diesel engine combustion is true?

A

Maximum cylinder firing pressure is not developed until the piston passes TDC.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The duration of the power event shown in the four cycle engine polar timing diagram is represented by how many crankshaft degrees of revolution? MO-0084

A

125 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In the illustrated polar timing diagram for a four-stroke cycle diesel engine, relative to crank degrees of travel with respect TDC or BDC as appropriate, when does the intake valve open? MO-0084

A

75 degrees before TDC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In the illustrated polar timing diagram for a four-stroke diesel engine, relative to the number of crank degrees before or after TDC or BDC as appropriate, when does the intake valve close? MO-0084

A

45 degrees after BDC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

According to the illustrated polar timing diagram for a four- stroke cycle diesel engine, the exhaust valve is open for a duration of how many degrees of crank travel? MO-0084

A

320 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

According to the illustrated polar timing diagram for a four- stroke cycle high speed diesel engine, the period of valve overlap occurs for a duration of how many degrees of crank travel? MO-0084

A

160 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The polar timing diagram shown in the illustration is of a four stroke cycle, high speed diesel engine, with fuel injection timing commencing at 10° BTDC. Approximately how many degrees will the crankshaft rotate from the point at which fuel injection begins to the point where the exhaust valves begin to open? MO-0084

A

135°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which segment of the two cycle engine diagram shown represents compression? MO-0037

A

I

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which segment of the two cycle engine diagram shown in the illustration represents ‘supercharging’? MO-0037

A

III

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which segment of the two cycle engine diagram shown in the illustration represents the exhaust event? MO-0037

A

IV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which segment of the two cycle engine diagram shown represents the power stroke? MO-0037

A

VI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

If point #1 in the diagram shown is the beginning of gas compression, which of the cycles listed is being illustrated? Illustration MO-0036

A

Diesel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

In the theoretical diesel cycle, shown in the illustration, which of the listed conditions normally takes place between points “3” and “4”? MO-0036

A

Expansion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In the pressure-volume diagram shown in the illustration, curve ‘A-d’ indicates __________. MO-0035

A

combustion at approximately constant pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

In the pressure-volume diagram, shown in the illustration, the volume line is divided into 16 units indicating __________. MO-0035

A

a 16 to 1 compression ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In the pressure-volume diagram, shown in the illustration, the volume line is divided into 16 units indicating __________. MO-0035

A

a 16 to 1 compression ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

In the pressure-volume diagram, shown in the illustration, what is indicated to have occurred by the line connecting points “d” and “e”? MO-0035

A

The combustion gases have expanded.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

In the pressure-volume diagram, shown in the illustration, what occurs between points “e” and “f”? MO-0035

A

Pressure in the cylinder decreases.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

In the pressure-volume diagram, shown in the illustration, what occurs between points “e” and “f”? MO-0035

A

Exhaust blow down occurs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

In the pressure-volume diagram shown in the illustration, the atmospheric pressure line is indicated by line __________. MO-0035

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

In the pressure-volume diagram shown in the illustration, fuel injection occurs at point __________. MO-0035

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Which of the bearings listed below is most widely used for the main and connecting rod bearings of a modern high-speed diesel engine?

A

Precision insert

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Babbitt is a metal alloy commonly used for lining __________.

A

Precision bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Which of the following methods is used to securely fasten the Babbitt lining of a reduction gear bearing to its shell?

A

The Babbitt is centrifugally spun into the bearings or cast under a pressure head.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Which of the following types of bearings are used as line shaft bearings?

A

Ring-oiled, Babbitt-faced, spherical seat, shell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

From the data given in the illustration, which pair of pistons listed are mounted on the same crank throw? MO-0004

A

3L/3R

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

From the engine data given in the illustration, what is the swept volume of any one engine cylinder? MO-0004

A

4766 cubic inches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

From the engine data shown in the illustration, what would be the average piston speed if the engine were turning 400 RPM? MO-0004

A

1400 ft/min

31
Q

From the engine data given, after cylinder #1L fires, how many degrees of crankshaft rotation must take place before #4L cylinder fires? MO-0004

A

90°

32
Q

From the engine data given in the illustration, what is the full load air manifold pressure? MO-0004

A

15.22 psi

33
Q

The camshafts on the engine, shown in the illustration, operate at a speed equal to __________. MO-0005

A

one-half of the crankshaft speed

34
Q

Which of the following characteristics can be determined about the standby diesel engine shown in the illustration? MO-0005

A

The camshaft rotates at one half the engine speed.

35
Q

According to the diagram shown in the illustration, the lube oil system can best be described as a __________. MO-0007

A

wet sump system

36
Q

If the manufacturer’s instructions do not state otherwise, which of the following progressions represent the best order for tightening the head bolts shown in the illustration? MO-0028

A

15372648

37
Q

Which of the indicator diagrams illustrated depicts the condition that should be corrected by retarding only the timing? MO-0029

A

A

38
Q

The instrument shown in the illustration would be used on a diesel engine to __________. MO-0031

A

take compression and firing readings

39
Q

On a main propulsion diesel engine, the instrument shown in the illustration would normally be attached to the __________. MO-0031

A

cylinder blow down valve

40
Q

Which area of the indicator diagram illustrated indicates the afterburning period in a diesel engine cylinder? MO-0033

A

K

41
Q

In the pressure-volume diagram, shown in the illustration, what is indicated to have occurred by the line connecting points “d” and “e”? MO-0035

A

the combustion gases have expanded

42
Q

The boiler shown in the illustration would be classed as __________. MO-0064

A

single-pass, fire- tube, scotch marine

43
Q

The illustration shown describes a _______. MO-0069

A

two cycle opposed piston diesel engine

44
Q

Which of the following statements would apply when checking the valve clearance of the unit shown in the illustration? MO-0074

A

Cold valve clearance is measured between components “C” and “D”.

45
Q

When inspecting the valve mechanism shown in the illustration, normal maintenance would include __________. MO-0074

A

measuring the cold valve clearance between components “C” and “D”

46
Q

The device shown in the illustration is a __________. MO-0070

A

hydraulic lash adjuster

47
Q

The device shown has been removed from an exhaust valve bridge assembly. The function of the illustrated device is to __________. MO-0070

A

maintain valve lash adjustment

48
Q

The RPM of “D” is 500 and hobbed with 36 teeth. If gears “A”, “B”, and “C” have 72, 64, and 24 teeth respectively, the RPM of “A” in the gear train illustration is __________. MO-0088

A

93.75 RPM

49
Q

The RPM of “D” is 800 and hobbed with 38 teeth. If gears “A”, “B”, and “C” have 80, 62, and 20 teeth respectively, the RPM of “A” in the gear train illustration is __________. MO-0088

A

122.58 RPM

50
Q

In the illustration, If gear A has 72 teeth, gear B has 64 teeth, gear C has 24 teeth and gear D has 36 teeth, what is the RPM of the gear D if gear A is turning at 100 RPM? MO-0088

A

533.33 RPM

51
Q

The RPM of “A” is 100 and hobbed with 76 teeth. If gears “B”, “C”, and “D” have 60, 32, and 42 teeth respectively, the RPM of “D” in the gear train illustration is __________. MO-0088

A

339.29 RPM

52
Q

After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder liner. This ridge must be removed during maintenance in order to prevent __________.

A

breaking of the rings, ring lands, or both during piston removal

53
Q

The ring lands on a large, low-speed, main propulsion diesel engine piston may crack due to __________.

A

insufficient ring groove clearance

54
Q

The proper location for journal bearing oil grooves is __________.

A

as a side relief where the two shells meet

55
Q

The part labeled “G”, as shown in the illustration, is a __________. MO-0040

A

connecting rod bushing

56
Q

The part labeled “F” shown in the illustration, is the __________. MO-0040

A

bearing shell halves

57
Q

The part labeled “E”, as shown in the illustration, is the __________.

A

connecting rod cap

58
Q

The illustration is of a/an __________. Illustration MO-0044

A

air driven starter motor assembly

59
Q

The Bendix drive on the starting motor illustrated is indicated by piece number __________. MO-0044

A

53

60
Q

In the illustration, pieces #31 and #29, have 16 and 55 teeth respectively. In order to start the engine, the Bendix drive must turn 3000 RPM. Therefore, the air motor assembly must rotate at __________. MO-0044

A

10312.5 RPM

61
Q

On the cylinder indicator diagram illustrated, the dotted line indicated as ‘L’ is describing the _________. Illustration MO-0033

A

cylinder pressure without injection

62
Q

Which area of the indicator diagram illustrated, indicates the ignition delay period in a diesel engine cylinder? Illustration MO-0033

A

J

63
Q

On the cylinder indicator diagram illustrated, the maximum rise in pressure occurs during the period labeled as ______. Illustration MO-0033

A

H

64
Q

In the illustration shown, if a crankcase explosion occurs in a diesel engine, which of the following will occur? MO-0105

A

Spring #11 will be compressed

65
Q

What is the purpose of the device shown in the illustration? MO-0105

A

Protect the crankcase from overpressure in the event of explosion.

66
Q

One method of determining crankshaft misalignment is by __________.

A

taking micrometer readings between the crank cheeks opposite the crankpin every 90° of crank angle rotation

67
Q

High-speed, multi-cylinder, diesel engines commonly use counterweights placed opposite to the crankpins to __________.

A

provide dynamic balance by equalizing centrifugal force

68
Q

The bearing shown in the illustration is designed to carry thrust when applied
__________. Illustration MO-0001

A

right to left only

69
Q

The part labeled “C” of the illustrated bearing is called the __________. MO-0001

A

Cage

70
Q

The part labeled “A” of the illustrated bearing is called the __________. MO-0001

A

inner race

71
Q

Valve ‘1’, as shown in the illustration when, should be operated when __________. Illustration MO-0077

A

entering or departing port.

72
Q

As shown in the illustration, the viscosimeter would be used to directly control the output of which of the following components? Illustration MO-0077

A

Final heaters.

73
Q

Fuel injection pumps using the port and helix metering principle requires the use of a __________.

A

lapped plunger and barrel

74
Q

The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to __________.

A

assist in a quick cutoff of fuel injection

Asst Engineering UFIV (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions