DGCA Module 05 Digital Techniques, 1st Session of 2017 covered umber systems binary, octal, hexadecimal, basic logic gates, Boolean algebra, flip-flops and mixed type questions.
DGCA Module 05
1st Session of 2017
1. If more number of bits are used in DAC converter, greater is the.
A) Resolution
B) Speed
C) Accuracy
D) None of the above
Answer
2. The basic analog for digital conversion ADC has.
A) Single analogue input & a number of digital outputs
B) Single digital input & a number of digital outputs
C) Number of digital inputs & single output
Answer
3. The required parallel-to-serial and serial-to-parallel data conversion is carried out by a bus interface using self-clocking in.
A) Synchronous
B) Asynchronous
C) Data Conversion
Answer
4. ARINC 429 can connect number of receivers.
A) 20
B) 120
C) 180
Answer
5. Rays entering from the edges will.
A) Take longer paths & travel slower
B) Take shorter paths & travel slower
C) Take longer paths & travel faster
D) Take shorter paths & travel faster
Answer
6. A typical fibre optic cable connector has.
A) Alignment key & groove
B) Guide pins & cavities
C) A & B
D) None
Answer
7. Grounding and bonding resistance of.
A) Less than 0.001Ω to 0.003Ω
B) Less than 0.01Ω to 0.02Ω
C) Higher than 0.32Ω to 0.25Ω
D) Less than 0.2Ω to 0.6Ω
Answer
8. BITE functions or capabilities include.
A) Real-time critical monitoring
B) Module/subassembly failure location
C) Go/no-go alarms
D) All the above
Answer
9. A method used in modern aircraft for reporting in-flight faults to an engineering ground base.
A) TCAS II
B) ACARS
C) GPS
Answer
10. Advantage of CRT over LCD is.
A) Wide angle viewing
B) Lower power consumption
C) Brighter with extremely bright coloured display
D) All of the above
Answer
11. Convert decimal 65535 into hex.
A) FFFF
B) FADF
C) FDFF
D) FFDF
Answer
12. The process of sampling approximation of an analogue signal to a series of discrete levels is.
A) Pre-holding
B) Quantizing
C) Data conversion
Answer
13. Attenuation in an optical fibre is due to.
A) Absorption
B) Scattering
C) Radiation
D) All the above
Answer
14. 3 beams in CRT associated with colours are.
A) Red, yellow and blue
B) Red, green and blue
C) Green, blue and yellow
D) None of the above
Answer
15. A seven-segment LED display has segment a, b, c illuminated. The character displayed will be.
A) 2
B) 3
C) 5
D) 4
Answer
16. What controls the function of deflecting the electron beam.
A) Cathode
B) Anode
C) Horizontal plates
D) All of the above
Answer
17. ARINC 629 can connect number of receivers.
A) 120
B) 20
C) 180
Answer
18. Logic gate that produces a logic 1 output when all inputs are simultaneously at logic 0.
A) NOR gate
B) NOT gate
C) OR gate
D) AND gate
Answer
19. Logic function of a combination logic circuit can be described by.
A) Truth table
B) Boolean algebra
C) A & B
D) None
Answer
20. The AIDS (Aircraft Integrated Data System) collects and records operational data to permit detailed analysis of.
A) Aircraft performance
B) Maintenance requirements
C) A & B D) None
Answer
21. 777 incorporates.
A) Honeywell AIMS
B) Airbus
C) Boeing
Answer
22. On triboelectric series, which of the following is said to be neutral.
A) Cotton
B) Glass
C) Wood
D) Polyester
Answer
23. Devices that are most prone to damage are those based on the use of.
A) Field effect technology
B) Magnetic tape
C) Rectifiers
Answer
24. A Level A software classification is one where a failure could result in.
A) Minor failure
B) Hazardous/severe major failure
C) Catastrophic failure
D) Major failure
Answer
25. User modifiable software can usually be upgraded by.
A) Aircraft operator
B) Design organisation
C) Equipment manufacturer
D) All the above
Answer
26. Grounding and bonding can also be possible in minimising the effect of.
A) HIRF (High-Intensity Radiated Fields)
B) Hydraulic resonance
C) Cabin pressurization
Answer
27. A flip-flop is a device used to.
A) Amplify signals
B) Store binary data
C) Filter analog signals
D) Convert AC to DC
Answer
28. The binary equivalent of decimal number 25 is.
A) 11001
B) 10101
C) 11100
D) 10011
Answer
29. The output of an XOR gate is true when.
A) All inputs are true
B) All inputs are false
C) Inputs are different
D) Inputs are same
Answer
30. Which of the following represents the smallest unit of data in a digital system.
A) Byte
B) Word
C) Bit
D) Nibble
Answer
31. In a 4-bit binary counter, the count sequence ranges from.
A) 0000 to 1111
B) 0001 to 1110
C) 1111 to 0000
D) 0000 to 1000
Answer
32. A register in digital electronics is used to.
A) Perform arithmetic operations
B) Convert analog to digital
C) Store data temporarily
D) Decode instructions
Answer
33. The ASCII code is primarily used to represent.
A) Images
B) Sounds
C) Characters
D) Colors
Answer
34. In digital communication, noise affects.
A) Voltage only
B) Signal accuracy
C) Temperature only
D) Resistance only
Answer
35. Parity bit in digital transmission is used for.
A) Increasing speed
B) Error detection
C) Reducing size
D) Timing
Answer
36. A digital signal is.
A) Continuous and variable
B) Discrete and binary
C) Analog and smooth
D) None of the above
Answer
37. Which counter counts both up and down.
A) Binary counter
B) Ring counter
C) Up/Down counter
D) BCD counter
Answer
38. What is the primary function of a multiplexer.
A) Convert analog to digital
B) Store data
C) Select one of many inputs
D) Count clock pulses
Answer
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