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 earliest form of transmission lines. It supports TM and TE mode, but it not supports TEM 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 Internal Radiated 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 antenna.
3. Characteristic impedance of a cable depends only on the resistance per foot of the wire used.
Explanation: 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) type of media 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: A signal has two sidebands which are exactly the mirror images of each other. So we can remove one side band which 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: 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) Asynchronous Transfer Model
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. Ethernet was invented by Xerox.
10. MAN stands for ________
a) Manchester 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.