This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Reactance Modulator”.
1. Which is the dominant mode for a rectangular waveguide?
a) TE 01
b) TM 01
c) TE 10
d) TM 10
Explanation: Rectangular waveguides are the earliest form of transmission lines. It supports TM and TE mode, which stands for Transverse Magnetic waves and Transverse Electric waves respectively, but it does not support TEM, Transverse Electromagnetic waves, mode. A rectangular waveguide can’t propagate below some certain frequency. The dominant mode for it is TE 10 mode.
2. EIRP stands for _________
a) Effective Isotropic Radiated Power
b) Effective Isotropic Reflected Power
c) Effective Isotropic Refracted Power
d) Effective Isotropic Regulated Power
Explanation: ERIP stands for Effective Isotropic Radiated Power. It is basically the output power when a signal is concentrated into a smaller area with the help of the antenna.
3. Characteristic impedance of a cable depends only on the resistance per foot of the wire used.
Explanation: Characteristic Impedance is the ratio of voltage amplitude to current amplitude of a propagating electromagnetic wave. The characteristic impedance of a cable depends on the inductance per foot and the capacitance per foot.
4. When calculating the maximum number of users, limiting factor in FDM is ___________
a) bandwidth of each signal
b) type of each signal
c) amplitude of each signal
d) length of the channel
Explanation: When calculating the maximum users in frequency division multiplexing, the bandwidth of each transmitting signal must be observed very carefully and thus it is also the limiting factor in FDM.
5. The minimum channel Bandwidth is used by which modulation technique?
Explanation: The minimum channel bandwidth is used by SSB modulation technique. In this technique, the carrier is suppressed and only either of the two sidebands is transmitted. Thus, it reduces the power consumption and also further reduces its bandwidth.
6. CDMA stands for Carrier Division Multiple Access.
Explanation: CDMA stands for Code Division Multiple Access. It refers to any protocol that is used in second generation and third generation wireless communication.
7. QPSK symbol contains ________
a) a byte
b) 4 bits
c) a dibit
d) 8 bits
Explanation: QPSK stands for Quadrature Phase Shift Keying which is a digital signal modulation scheme. In QPSK, only two bits are transmitted per symbol. It represents 00, 01, 10, 11
8. What is the full form of ATM?
a) Asynchronous Transfer Mode
b) Asynchronous Transmission Mode
c) Automatic Transmission Mode
d) Automatic Transfer Mode
Explanation: ATM stands for Asynchronous Transfer Mode. It uses asynchronous time division multiplexing and encodes data into small but fixes size packets.
9. Who invented the Ethernet?
Explanation: Ethernet is a computer technology mostly used in LANs. LAN connects devices sharing a common network or linked by the same server. Ethernet was invented by Xerox.
10. MAN stands for ________
a) Metropolitan Access Network
b) Metropolitan Area Network
c) Multiple Area Network
d) Multiple Access Network
Explanation: MAN stands for Metropolitan Area Network. It interconnects computers that are under a fixed geographic area larger than that covered by LAN but smaller than the area covered by WAN.
Sanfoundry Global Education & Learning Series – Analog Communications.
To practice all areas of Analog Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.