Basics MCQ

Test your knowledge with important Basics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Basics MCQs at Bissoy

• The OS X has ____________
  ক

  monolithic kernel

  খ

  hybrid kernel

  গ

  microkernel

  ঘ

  monolithic kernel with modules
• Which facility dynamically adds probes to a running system, both in user processes and in the kernel?
  ক

  DTrace

  খ

  DLocate

  গ

  DMap

  ঘ

  DAdd
• Which one of the following error will be handle by the operating system?
  ক

  power failure

  খ

  lack of paper in printer

  গ

  connection failure in the network

  ঘ

  all of the mentioned
• To access the services of operating system, the interface is provided by the ___________
  ক

  System calls

  খ

  API

  গ

  Library

  ঘ

  Assembly instructions
• Which of the following is mainly used in electronic scanning?
  ক

  Phase shifters

  খ

  Amplifiers

  গ

  Repeaters

  ঘ

  Limiters
• In which of the following scanning the phase of the radiator is constant at one frequency?
  ক

  Phase scanning

  খ

  Frequency scanning

  গ

  Both Phase and frequency scanning

  ঘ

  Neither Frequency nor Phase scanning
• In which of the following type of scanning a heterodyne is used?
  ক

  IF Scanning

  খ

  Frequency scanning

  গ

  Phase scanning

  ঘ

  Digital beam-forming
• In Frequency scanning, the phase of all radiators is constant for the frequency tuned at that instant
  ক

  True

  খ

  False
• Electronic scanning is more advantageous compared to mechanical scanning
  ক

  True

  খ

  False
• Which of the following principle is used in the phased array radar?
  ক

  Interference

  খ

  Diffraction

  গ

  Reflection

  ঘ

  Refraction
• In which of the following a single radiator source is used to feed antenna with different phase shifts?
  ক

  Phased array

  খ

  FMCW radar

  গ

  Monopulse radar

  ঘ

  CW radar
• Which of the following is used as a secondary antenna in the reflector antenna?
  ক

  Horn

  খ

  Feed antenna

  গ

  Parabolic

  ঘ

  Dipole
• When a reflector is placed at the foci along the feed it is called ____ antenna
  ক

  Dual reflector antenna

  খ

  Plane antenna

  গ

  Wire antenna

  ঘ

  Convex-Convex
• Which of the following is not a reflector antenna?
  ক

  Convex-convex

  খ

  Corner

  গ

  Gregorian

  ঘ

  Cassegrain
• Which of the following is false regarding a reflector antenna?
  ক

  Reflector antennas are high gain antennas with two antennas

  খ

  Both the primary and secondary antennas are excited

  গ

  The pattern of the reflector in the reflector antenna is the Secondary pattern

  ঘ

  A dual reflector contains two reflectors and one primary feed
• Which of the following efficiency is used to measure the power-loss at the feed pattern which is intercepted by reflector?
  ক

  Spillover

  খ

  Illumination

  গ

  Taper

  ঘ

  Aperture
• Which of the following combination forms a Cassegrain antenna?
  ক

  The main reflector is parabolic and sub-reflector is hyperbolic

  খ

  The main reflector is parabolic and sub-reflector is concave

  গ

  The main reflector is hyperbolic and sub-reflector is parabolic

  ঘ

  The main reflector is hyperbolic and sub-reflector is convex
• Which of the following is a dual reflector antenna?
  ক

  Cassegrain antenna

  খ

  Parabolic antenna

  গ

  Offset reflector antenna

  ঘ

  Wire antenna
• Reflector antenna operates on the Geometric optics principle?
  ক

  True

  খ

  False
• Which of the following refers to the pattern of reflector in the reflector antenna?
  ক

  Primary pattern

  খ

  Secondary pattern

  গ

  Reflector pattern

  ঘ

  Feed pattern
• 10.Radiation resistance of a half-wave dipole is ______
  ক

  36.56Ω

  খ

  18.28Ω

  গ

  73.12Ω

  ঘ

  40.24Ω
• The axis of back lobe makes an angle of 180° with respect to the beam of an antenna.
  ক

  True

  খ

  False
• Equivalent circuit representation of an antenna is ______
  ক

  Series R, L, C

  খ

  Parallel R, L, C

  গ

  Series R, L parallel to C

  ঘ

  Parallel R, C series to L
• The equivalent area when multiplied by the instant power density which leads to free radiation of power at antenna is called as _______
  ক

  Loss area

  খ

  Scattering area

  গ

  Captured area

  ঘ

  Effective area
• What is the overall efficiency of a lossless antenna with reflection coefficient 0.15?
  ক

  0.997

  খ

  0.779

  গ

  0.669

  ঘ

  0.977
• The relation between vector magnetic potential and current density is given by ______
  ক

  ∇.A=J

  খ

  ∇×A=H

  গ

  ∇2 A=-μJ

  ঘ

  ∇2 A=∇×H
• Network congestion occurs _________
  ক

  in case of traffic overloading

  খ

  when a system terminates

  গ

  when connection between two nodes terminates

  ঘ

  in case of transfer failure
• A list of protocols used by a system, one protocol per layer, is called ________
  ক

  protocol architecture

  খ

  protocol stack

  গ

  protocol suite

  ঘ

  protocol system
• A __________ is a device that forwards packets between networks by processing the routing information included in the packet.
  ক

  bridge

  খ

  firewall

  গ

  router

  ঘ

  hub
• Bluetooth is an example of __________
  ক

  personal area network

  খ

  local area network

  গ

  virtual private network

  ঘ

  wide area network