Explore topic-wise MCQs in Avionics.

This section includes 31 Mcqs, each offering curated multiple-choice questions to sharpen your Avionics knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is not an advantage of time division multiplexing?

A. Signal interference is less
B. More flexible
C. Full channel can be used for every signal
D. Fast data transfer
Answer» E.
Discussion
2.

In a four channel system, all four signals transmitted contain information.

A. True
B. False
Answer» C.
Discussion
3.

The polarization of plane waves received from satellite is changed by ________

A. Faraday rotation
B. Gamma rays
C. Helical rotation
D. Distance travelled
Answer» B. Gamma rays
Discussion
4.

“Ground Effect” in antenna caused by ________

A. faulty connection of the feed cable ground
B. fading
C. buildings and other structures on ground
D. radio signals reflecting off the ground
Answer» E.
Discussion
5.

The real part of an antenna’s input impedance is due to ________

A. SWR
B. radiated signal
C. reflected signal
D. refracted signal
Answer» C. reflected signal
Discussion
6.

WHICH_OF_THE_FOLLOWING_IS_NOT_AN_ADVANTAGE_OF_TIME_DIVISION_MULTIPLEXING??$

A. Signal interference is less
B. More flexible
C. Full channel can be used for every signal
D. Fast data transfer
Answer» E.
Discussion
7.

THE_POLARIZATION_OF_PLANE_WAVES_RECEIVED_FROM_SATELLITE_IS_CHANGED_BY_________?$

A. Faraday rotation
B. Gamma rays
C. Helical rotation
D. Distance travelled
Answer» B. Gamma rays
Discussion
8.

PTM_STAND_FOR__________________?$

A. Pulse train modulation
B. Pulse time modulation
C. Power train modulation
D. None of the mentioned
Answer» C. Power train modulation
Discussion
9.

What_is_the_input_impedance_to_a_lossless_antenna,_at_resonance?$

A. infinite
B. 0
C. resistive
D. capacitive
Answer» D. capacitive
Discussion
10.

Which_of_the_following_can_be_generated_from_PDM_signal?$

A. PPM
B. PTM
C. PAM
D. PFM
Answer» B. PTM
Discussion
11.

In a four channel system, all four signals transmitted contain information?

A. True
B. False
Answer» C.
Discussion
12.

“Ground Effect” in antenna caused by _______?#

A. faulty connection of the feed cable ground
B. fading
C. buildings and other structures on ground
D. radio signals reflecting off the ground
Answer» E.
Discussion
13.

Amplitude of each pulse of PAM train conveys the amplitude of particular channel sampled?

A. True
B. False
Answer» B. False
Discussion
14.

What are used to reduce or stop synchronization problems while receiving?

A. Clock recovery circuits
B. Demodulators
C. Synchronizer
D. Band pass filter
Answer» B. Demodulators
Discussion
15.

What is the full form of ERP?

A. Effective Radiated Power
B. Effective Reflected Power
C. Equivalent Radiated Power
D. Equivalent Reflected Power
Answer» B. Effective Reflected Power
Discussion
16.

Maximum rate of commutation will be _________________

A. 800 sample per second
B. 900 sample per second
C. 1200 sample per second
D. 1000 sample per minute
Answer» C. 1200 sample per second
Discussion
17.

The circuit used to regenerate clock pulses from the transmitted PAM signals is called ____

A. Clock demodulator circuits
B. Timer circuits
C. Clock receiving circuits
D. Clock recovery circuits
Answer» E.
Discussion
18.

When an antenna radiates more energy in one direction than in other directions, it is called ________

A. selectivity
B. directivity
C. active antenna
D. resonance
Answer» C. active antenna
Discussion
19.

What will be the general number of samples per frame?

A. 18
B. 30
C. 18 or 30
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
20.

What is the purpose of one shot multivibrator?

A. Trigger all AND gates at clock frequency
B. Trigger all OR gates at clock frequency
C. Trigger all AND gates at signal frequency
D. Trigger all OR gates at signal frequency
Answer» B. Trigger all OR gates at clock frequency
Discussion
21.

Which of the following represents number of samples per second?

A. Product of frame rate and number of samples per frame
B. Frame rate
C. Ratio of samples per frame and frame rate
D. None of the mentioned
Answer» B. Frame rate
Discussion
22.

What is the time allocated for each channel if the number of samples per frame is 4 and the frame rate is 100frames/sec?

A. 1.2ms
B. 3ms
C. 2.5ms
D. 0.54ms
Answer» D. 0.54ms
Discussion
23.

Measured on the ground, the field strength of a horizontally polarized half wave dipole antenna is strongest ________

A. in one direction
B. in two directions
C. depends on the number of elements
D. depends on the shape of antenna
Answer» C. depends on the number of elements
Discussion
24.

Commutators are mechanical switches in operation.

A. True
B. False
Answer» B. False
Discussion
25.

Which of the following device was used in early TDM/PAM telemetry systems?

A. Commuter
B. Linear switch
C. Logic gates
D. DSP
Answer» B. Linear switch
Discussion
26.

What is the other name for half-wave dipole antenna?

A. Helical antenna
B. Isotropic antenna
C. Hertz antenna
D. Maxwell antenna
Answer» D. Maxwell antenna
Discussion
27.

PAM stands for _______________

A. Pulse Amplitude Modulation
B. Power Amplitude Modulation
C. Pulse Additive Modulation
D. Pulse Amplitude Masking
Answer» B. Power Amplitude Modulation
Discussion
28.

What device is used to demodulate a time division multiplexed analog wave?

A. High pass filter
B. Low pass filter
C. Band stop filter
D. Attenuator
Answer» C. Band stop filter
Discussion
29.

Which of the following data is correct for TDM?

A. Analog data is transmitted
B. Digital data is transmitted
C. Both analog and digital data transmitted
D. None of the mentioned
Answer» B. Digital data is transmitted
Discussion
30.

Serial transmission is not possible without time division multiplexing.

A. True
B. False
Answer» B. False
Discussion
31.

Frequency division multiplexing:Frequency slots::time division multiplexing:?

A. Time slots
B. Coded information
C. Pulsed information
D. Band slots
Answer» B. Coded information
Discussion