DGCA Technical General: Computers, Logic & Radio Theory Questions
146 exam-style Computers, Logic & Radio Theory questions for the DGCA Technical Generalpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
Because of its function an ‘AND’ gate may also be referred to as:
- A Invert or not gate
- B Any or all gate
- C All or nothing gate
- D Either or gate
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Correct answer: C. All or nothing gate
An AND gate produces a logic 1 output only when every one of its inputs is at logic 1; if any input is missing there is no output. Because it needs all inputs present to give an output, and nothing otherwise, it is aptly described as an all-or-nothing gate.
- Q2
What is an EPROM?
- AA memory that erases itself when the computer is switched off.
- BA memory that cannot be erased.
- CA memory that retains data when the computer is switched off but that can be re-programmed when necessary.
- DA memory that retains data when the computer is switched off and cannot be re-programmed.
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Correct answer: C. A memory that retains data when the computer is switched off but that can be re-programmed when necessary.
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- Q3
Why is an X band weather radar used rather than a C band?
- AThe C band critical ray is too small.
- BThe C band sky ray is too weak.
- CC band wavelength is too long.
- DThe C band reflected ray is too weak.
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Correct answer: C. C band wavelength is too long.
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- Q4
Which of the firewire elements must be activated to ring the fire bell in circuit below?
- AA + B or C + D.
- BA + C or B + D.
- CA + D or C + D.
- DAny of the above.
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Correct answer: B. A + C or B + D.
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- Q5
Refering to the following diagram: To get logic 1 output at A there must be a logic 1 input at:
- A C1 and C2 only
- B C1 and C3 only
- C C2 and C4 only
- D C3 only
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Correct answer: A. C1 and C2 only
For an AND-based logic circuit the output at A can only reach logic 1 when both of the required inputs are simultaneously at logic 1, so the two specified inputs must both be high to obtain the output. If either input is low the output remains at logic 0.
- Q6
What is the First returning skywave called?
- AThe critical ray.
- BThe B-ray.
- CThe Wave.
- DThe sound wave.
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Correct answer: A. The critical ray.
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- Q7
What is a ROM?
- AA memory that erases itself when the computer is switched off.
- BA memory that cannot be erased.
- CA memory that retains data when the computer is switched off but that can be re-programmed when necessary.
- DA memory that retains data when the computer is switched off and cannot be re-programmed.
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Correct answer: D. A memory that retains data when the computer is switched off and cannot be re-programmed.
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- Q8
When does the maximum fading of an HF wave occur?
- AWhen the waves are more than 90 degrees out of phase.
- BWhen the waves are 90 degrees out of phase.
- CWhen the waves are in phase.
- DWhen the waves are 180 degrees out of phase.
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Correct answer: B. When the waves are 90 degrees out of phase.
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- Q9
An AND gate is sometimes referred to as?
- AAn anything or nothing gate.
- BAn all or nothing gate.
- CAn everything and nothing.
- DA something or nothing gate.
Show answer
Correct answer: B. An all or nothing gate.
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- Q10
506.When responding to a TCAS li resolution advisory, the crew must respond within
- A2.5 seconds using G-Forces of +/-0.25g
- B5 seconds using G-Forces of +/-0.25€
- C5 seconds using G-Forces of +/0.5g
Show answer
Correct answer: A. 2.5 seconds using G-Forces of +/-0.25g
A resolution advisory demands an immediate but gentle manoeuvre: the required vertical-speed change is flown with accelerations of about a quarter g, and the reaction must come within seconds because the collision-avoidance geometry leaves almost no time margin.
- Q11
What is the metric distance of an NDB wavelength?
- ADecimetric
- BCentmetric
- CMetric
- DMetric or Kilometric
Show answer
Correct answer: D. Metric or Kilometric
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- Q12
what does this represent?
- AAny or all gate.
- BAll or nothing gate.
- CAn inverted or NOT gate.
- DA something or nothing gate.
Show answer
Correct answer: C. An inverted or NOT gate.
This Explanation is Coming Soon
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