YOUR LBP ASSESSMENT PAPER 5/1 EASA MODULE 5 CATEGORY B1 B2 DIGITAL TECHNIQUES To be completed after studying the module. If the module has more than one assessment assess ment paper then is to be completed after studying the appropriate part of the module. After completion mark your paper using the marking guide attached. It is recommended that you sit this assessment as if you are doing an actual CAA examination. After-all, it is more a learning tool than an examination. In this way it gets you used to the examination environment and helps in the learning process. The CAA allow 1.3 minutes per question so you can gauge the approximate time in which to complete this paper.
EASA 66 5/1
Licence By Post
MODULE 5 – DIGITAL TECHNIQUES & ELECTRONIC SYSTEMS MULTIPLE CHOICE PAPER
Questions marked * are for B2 students only.
1.
The binary for 27 is: a) b) c)
2.
The decimal equivalent of 1011012 is: a) b) c)
3.
1101100. 0110110. 11010100.
The Octal System has a base of: a) b) c)
6.
1538. 6118. 538.
Convert 3248 to Binary: a) b) c)
5.
42. 45. 43.
* Convert 11010112 to Octal: a) b) c)
4.
11011. 11010. 10101.
12. 8. 16.
* Convert 1110110112 to hexadecimal: a) b) c)
7AD16. 1DB16. 1BD16.
7. * Convert AE16 to binary: a) b) c)
10101110. 11000001. 10101010. -1-
ISSUE 9
8. * Convert 8710 to BCD: a) b) c)
0001 1110. 0111 1000. 1000 0111.
9. * Convert the BCD number 0110011001 to decimal: a) b) c) 10.
A 0 1 0 1
84410. 17710. 19910. B 0 0 1 1
S 1 1 1 0
The truth table is for a: a) b) c) 11.
The Boolean expression A B + A B = S represents the output of: a) b) d)
12.
NAND gate. XOR gate. NOR gate.
The Boolean expression A + B represents the output of an: a) b) c)
13.
NAND gate. NOR gate. XOR gate.
OR gate. NOR gate. AND gate.
Two switches in parallel can be represented by an: a) b) c)
OR gate. AND gate. XOR gate.
14.
The equivalent of the gate shown is a: a) b) c)
AND gate. OR gate. NOR gate. -2-
15.
* VLSI means that the number of gates in a single I C package is: a) b) c)
16.
Up to 1000. Up to 100. Over 1000.
* Fan-in of a gate is the: a) b) c)
Number of outputs from a gate. Number of inputs to a gate. The number of inputs and outputs to a gate.
17.
The gates above represent: a) b) c) 18.
* An SR Flip-Flop is set when: a) b) c)
19.
Q = 0 Q = 1. Q = 1 Q = 1. Q = 1 Q = 0.
* An encoder is used to: a) b) c)
21.
Q = 1. Q = 1. Q = 0.
* In a JK flip flop assuming Q = 0 Q = 1 and logic 1 is applied to J and K inputs the result will be: a) b) c)
20.
A NOT gate. An AND gate. An OR gate.
Convert the output signal from binary to a signal for operation of component or indicator. Convert the input signal into binary signal necessary for operation of the system. Convert a digital signal to an analogue signal.
* A Multiplexer: a) b) c)
Takes many signals in and puts these signals in a serial transmission on the output. Takes one signal in and puts this signal in parallel transmission to a number of outputs. Takes many signals in and puts these in a parallel transmission on the output. -3-
22.
The software element of a computer is the: a) b) c)
23.
The CPU in a computer system is the: a) b) c)
24.
Operates slower. Has a smaller storage capacity per chip area. Is cheaper to manufacture.
The ROM: a) b) c)
28.
Read/write memory. Read only memory. Random access microprocessor.
* The advantage of a DRAM over a SRAM is that it: a) b) c)
27.
Register, arithmetic logic unit only. Arithmetic logic unit, timing and control section, register. Register, timing and control section only.
A RAM is: a) b) c)
26.
Central Position Unit. Central Power Unit Central Processing Unit.
* The CPU consist of: a) b) c)
25.
The CPU. The programme. The control bus.
Has no memory. Is a non-volatile memory. Is a volatile memory.
A BYTE is usually a: a) b) c)
12 bit word. 8 bit word. 6 bit word.
29. * The highway structure for a computer has the following buses: a) b) c)
Address, data, control. Control, data, memory. Memory, address, control.
-4-
30.
The ARINC 429 SYSTEM uses the following system to transfer data: a) b) c)
31.
ARINC 429 system has a: a) b) c)
32.
Bi-polar return to zero. Manchester bi-phase. Non return to zero.
The general arrangement of ARINC 629 includes: a) b) c)
37.
Remote Controller. Synch Controller. Bus Controller
* Data is transferred on the MIL-STD-1553B by using: a) b) c)
36.
429. 629. 573.
In the MIL-STD-1553B standard, transfer of data on the bus is achieved by a: a) b) c)
35.
Odd parity. Even parity. No parity.
Which of the following ARINC’s are bi-directional: a) b) c)
34.
26 bit word. 32 bit word. 18 bit word.
ARINC 429 uses: a) b) c)
33.
Non-return to zero. Harvard bi-phase. Bipolar return to zero.
Current mode coupler, data bus cable only. Data bus cable, stub cable, voltage mode coupler. Data bus cable, current mode coupler, stub cables.
One of the advantages of fibre optic cables compared to “twisted pair” cables is that they are: a) b) c)
Slower in operation. Not suitable for multiplex signals. Smaller in size and weight. -5-
38.
* The fibre optic cable can be identified on the aircraft by its jacket colour of: a) b) c)
39.
If three binary counters are connected in cascade the division is: a) b) c)
40.
Grid. Anode. Cathode.
To deflect the beam of a CRT horizontally, coils are placed on the neck of the tube: a) b) c)
45.
N-P-N junction. P-N junction. Zener diode.
Control of brightness on a CRT is achieved by the: a) b) c)
44.
Ensure dust caps are fitted. Use a wrist strap with a low grounding lead resistance. Use the extractors provided.
The light emitting diode is basically a: a) b) c)
43.
Ceramic lens type. Ball lens type. Butt type.
When removing a printed circuit board from an LRU you would: a) b) c)
42.
9. 8. 3.
For a fibre optic connector that is not regularly connected or disconnected, the connector to use would be a: a) b) c)
41.
Purple. Red. Yellow.
One on the side, one at the bottom. Each side. Top and bottom.
The waveform used to scan the screen of a CRT is: a) b) c)
Square waveform. Sawtooth waveform. Triangular waveform. -6-
46.
The timebase in a CRT consists of: a) b) c)
47.
The phosphor dots on the colour CRT screen are coated to individually produce: a) b) c)
48.
MAP, PLAN, VOR and ILS. PLAN, MAP only. VOR, ILS, MAP only.
The colour of failure indications on the EHSI is: a) b) c)
53.
Blanks. Goes monochromatic. Raster is removed.
The EHSI has which of the following modes? a) b) c)
52.
Line. Stroke. Raster.
If the CRT in an EADI overheated, initially the CRT: a) b) c)
51.
Both crew members systems. The captain’s instruments only. The first officer’s instruments only.
* The type of scanning used to produce the ground/sky colouring on an EADI is: a) b) c)
50.
Red, green, yellow. Blue, green, red. Green, blue, yellow.
The third symbol generator used in an EFIS is for back-up of: a) b) c)
49.
Amplifier and oscillator. Oscillator only. Amplifier only.
Red. Yellow. White.
In the layout of a modern aircraft flight-deck display the pilot would have directly in front of him/her the: a) b) c)
Primary Flight Display and ECAM. Navigation Display and ECAM. Primary Flight Display and Navigation Display. -7-
54.
* An ADIRU is a combination of: a) b) c)
55.
On EICAS the three levels of warning are: a) b) c)
56.
Status page. Synoptic display of the faulty system. Secondary engine parameters.
If the lower display unit fails on ECAM it can be transferred to: a) b) c)
61.
Secondary engine parameters. Flight phase page. Synoptic display.
Under fault conditions the lower display unit on ECAM shows the: a) b) c)
60.
All messages to be removed. Advisory messages only are removed. Advisory and caution messages to be removed.
During flight (non fault conditions) the ECAM system displays on the lower CRT the: a) b) c)
59.
Red in colour. Yellow in colour. Yellow in colour and indented by one space.
Pressing the CANCEL button on EICAS causes: a) b) c)
58.
Level A, B and C Level 1, 2 and 3. Level 1, 2, 3 and advisory.
On EICAS, if caution and advisories are displayed advisories are identified by being: a) b) c)
57.
Inertial Radio Unit and Air Data Computer. Air Data Computer and Instrument Reference Unit. Air Data Computer and Inertial Reference Unit.
Primary Flight Display. Navigation Display. Cannot be transferred.
The ARINC used in Flight Data Recording is: a) b) c)
537. 429. 573.
-8-
62.
The method of data transfer from the DFDAU to the DFDR (Flight Data Recording System) is: a) b) c)
63.
What are the resistance values of an ESDS wrist strap? a) b) c)
64.
Altimeter, mach/airspeed, ground proximity computer. Inertial reference unit, altimeter, EHSI. EADI, altimeter, mach/airspeed indicator.
Who can sign for a software update? a) b) c)
67.
Busbar is live. Weight switch is made. Engine is started.
A modern air data computer will feed information to: a) b) c)
66.
250k Ω to 1.5mΩ. 20MΩ to 50MΩ. 10k Ω to 150k Ω.
The flight data recorder is switched on in a helicopter when the: a) b) c)
65.
Bipolar return to zero. Harvard bi-phase. Non return to zero.
An appropriately authorised aircraft engineer. A category “C” engineer only. A CAA surveyor only.
Who can design new software? a) b) c)
A BCAR section A8 approved company. A BCAR section A1 approved company. The CAA.
68.
The flight director bars are displayed as shown, to respond the pilot would: a) b) c)
Fly down and right. Fly up and left. Fly up and right.
-9-
69.
The glideslope indicator on the ADI is displayed as shown above. To regain the glidepath the pilot would: a) b) c) 70.
The engine information to the flight data recorder is fed: a) b) c)
71.
EFIS. FMS. ECAM.
HIRF protection of LRU’s is provided by: a) b) c)
75.
EHSI. EADI. VSI.
Which display gives engine indications? a) b) c)
74.
Yes. No. Half have the same, the other half have a different gap.
Which display has an extended runway symbol? a) b) c)
73.
From dedicated transmitters. From normal transmitters with isolation between the transmitters and FDR. Direct.
In ARINC 629 is the terminal gap the same for all LRU’s: a) b) c)
72.
Fly up. Fly down. Stay on course.
Built in filters and over-voltage protection circuits. Internally shielded cables. Built in filters only.
If the inputs to a NAND gate are inverted the output will be: a) b) c)
An AND gate. An OR gate. A NOR gate.
- 10 -
76.
Using ARINC 429 BCD the data bits are: a) b) c)
77.
Which of the following is an opto-electronic device? a) b) c)
78.
Minor Effect. Major Effect. Catastrophic Effect.
What is the maximum bonding resistance for an electro-static device which has an operating voltage of 50 volts or higher? a) b) c)
83.
Vertical. Horizontal. Vertical and horizontal.
What is the meaning of software criticality level A? a) b) c)
82.
E. F. G.
In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction of the electronic beam movement? a) b) c)
81.
Can pass one signal. Smaller bandwidth. Larger bandwidth.
15 in hexadecimal is: a) b) c)
80.
A laser diode. A triac. A thyristor.
What is the advantage of a single mode fibre optic over ordinary electrical wire? a) b) c)
79.
11 – 28. 11 – 29. 1 – 8.
500,000 ohms 1 ohm. 0.05 ohm.
HF aerials are protected against lightning strikes by: a) b) c)
Double bonding. A spark gap. Screening. - 11 -
84.
To stop earth-loops forming: a) b) c)
85.
The maximum number of terminals that can be connected to ARINC 629 is: a) b) c)
86.
Triangular. Sawtooth. Trapezoid.
What frequency is used to create the raster effect on a CRT? a) b) c)
91.
20. 31. 120.
What is the deflection field on a CRT if electromagnetic deflection is used? a) b) c)
90.
OFST and FAIL. FAIL and MSG. MSG, FAIL and OFST.
The maximum number of terminals connected to ARINC 429 is: a) b) c)
89.
BINARY. BCD. OCTAL.
FMS alerting modes are: a) b) c)
88.
20. 31. 120.
In ARINC 429 the LABEL is in: a) b) c)
87.
Both ends of the cable screen are earthed. One end of the cable screen is earthed. The cable screen is not earthed.
50/60Hz. 20Hz. 120Hz.
Earth rate is approximately: a) b) c)
24°/hour. 15°/hour. 360°/hour.
- 12 -
92.
The IRS computes distance from acceleration by: a) b) c)
93.
Data bus cables are terminated using a: a) b) c)
94.
Requires no cooling. Takes less power. Has a narrow viewing angle.
How is software shown in a schematic diagram? a) b) c)
99.
3. 4. 2.
A disadvantage of LCD is that it: a) b) c)
98.
The ELAC. The ELAC and SEC. The SEC.
How many satellites are required in the GPS for accurate positioning? a) b) c)
97.
45° to each other. 60° to each other. 90° to each other.
On the fly-by-wire system of the A320, the stabiliser trim is controlled by: a) b) c)
96.
130Ω resistor. 100Ω resistor. 25Ω resistor.
In the IRS the accelerometers are mounted: a) b) c)
95.
Two successive differentiation’s. Two successive integration’s. One integration and one differentiation.
Hard lined box. Dotted lined box. Circled.
Parallel to series conversion is achieved by a: a) b) c)
Parallel to series converter. Shift register. Multiplexer/de-multiplexer.
- 13 -
100. In ARINC 629 an LRU connection to the data bus requires a: a) b) c)
Current mode coupler, serial interface module and terminal controller. Current mode coupler, terminal controller and a production break. Terminal controller and interface module.
101. The CMC (Central Maintenance Computer) is used to: a) b) c)
Perform in-flight and ground tests of aircraft systems, ie BITE. Give red warning and amber cautions to displays IAW system status. Perform in-flight BITE only.
102. Fly-by-wire load alleviation function in turbulent conditions will result in: a) b) c)
Ailerons moving symmetrically upwards. Ailerons and spoiler moving asymmetrically upwards. Spoilers moving symmetrically.
103. * What is the function of the status register within a computer? a) b) c)
To indicate the status of the microprocessor. To store a programme during interrupt. To synchronise the clock pulse.
104. In a fibre optic system, different light frequencies are separated by: a) b) c)
An active filter. A passive filter. A star network.
105. Sensors in a fly-by-light control system: a) b) c)
Require power for processors. Require no power. Require processing to give an output.
106. * What type of operational amplifier is used in a decoder? a) b) c)
Integrator. Comparator. Differentiator.
- 14 -
107. This circuit is:
a) b) c)
A comparator. A full adder. A half adder.
108. The dot matrix LED construction is: a) b) c)
4 x 7 or 5 x 9 rolling digit display. 4 x 7 or 9 x 5 rolling digit display. 5 x 9 or 7 x 4 rolling digit display.
109. If a sine wave voltage is applied to a circular time base circuit, the voltages on the X and Y plates are: a) b) c)
90° out of phase. 180° out of phase. In phase
110. To allow for high speed signals in a fibre optic data bus system to be coupled to many fibre stubs a: a) b) c)
Star coupler for each fibre stub is used. Only one star coupler is required. Two star couplers are required.
’’’’’’’’’’’’’’’’’’
- 15 -
EASA 66 5/1
Licence By Post
MULTI CHOICE ANSWER PAPER Name …………………………………..
ISSUE 9
Student number ………… Date ………….
Subject Digital Techniques & Electronic Systems Assessment number 1 of 1 sheet 1 of 2 A
B
C
A
B
C
A
B
C
A 61
B
C
A
1
21
41
2
22
42
62
82
3
23
43
63
83
4
24
44
64
84
5
25
45
65
85
6
26
46
66
86
7
27
47
67
87
8
28
48
68
88
9
29
49
69
89
10
30
50
70
90
11
31
51
71
91
12
32
52
72
92
13
33
53
73
93
14
34
54
74
94
15
35
55
75
95
16
36
56
76
96
17
37
57
77
97
18
38
58
78
98
19
39
59
79
99
20
40
60
80
100
B
C
81
ON COMPLETION OF THE PAPER CHECK YOUR ANSW ERS AGAINST THE MARKING GUIDE ATTACHED. DOUBLE CHECK ANY CORRECTED ANSWERS. PASS MARK IS 75%.
EASA 66 5/1
Licence By Post
MULTI CHOICE ANSWER PAPER Name ………………………………..
ISSUE 9
Student number ………… Date ………….
Subject Digital techniques & electronic systems Assessment number 1 of 1 sheet 2 of 2 A
B
C
A
B
C
A
B
C
A
B
C
A
101
121
141
161
102
122
142
162
1 82
103
123
143
163
183
104
124
144
164
184
105
125
145
165
185
106
126
146
166
186
107
127
147
167
187
108
128
148
168
188
109
129
149
169
189
110
130
150
170
190
111
131
151
171
191
112
132
152
172
192
113
133
153
173
193
114
134
154
174
194
115
135
155
175
195
116
136
156
176
196
117
137
157
177
197
118
138
158
178
198
119
139
159
179
199
120
140
160
180
200
B
C
181
ON COMPLETION OF THE PAPER CHECK YOUR ANSW ERS AGAINST THE MARKING GUIDE ATTACHED. DOUBLE CHECK ANY CORRECTED ANSWERS. PASS MARK IS 75%.
LBP Multiple choice answers (answers should be checked) EASA Part 66 B1/B2 licence module 5 Digital Techniques Assessment 5/1 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25 Q26 Q27 Q28 Q29 Q30 Q31 Q32 Q33 Q34 Q35 Q36 Q37 Q38 Q39 Q40 Q41 Q42 Q43 Q44 Q45 Q46 Q47 Q48 Q49 Q50
a b a c b b a c c a b a a a c b b a c b a b c b a c b b a c b a b c a c c a b c c b a c b a b a c c
Q51 Q52 Q53 Q54 Q55 Q56 Q57 Q58 Q59 Q60 Q61 Q62 Q63 Q64 Q65 Q66 Q67 Q68 Q69 Q70 Q71 Q72 Q73 Q74 Q75 Q76 Q77 Q78 Q79 Q80 Q81 Q82 Q83 Q84 Q85 Q86 Q87 Q88 Q89 Q90 Q91 Q92 Q93 Q94 Q95 Q96 Q97 Q98 Q99 Q100
a b c c a c c b b b c b b a a a a b a b b b b a b b a c b a c c b b c c c a c a b b a c b b c b b a
Q101 Q102 Q103 Q104 Q105 Q106 Q107 Q108 Q109 Q110
a b a b b b c b a b
