This is the Multiple Choice Questions in Chapter 22: Personal Communications Systems from the book Electronic Communication Systems by Roy Blake. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
See also: MCQ in Electronic Communication Systems by George Kennedy
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
MULTIPLE CHOICE
1. Current PCS systems are referred to as:
a. first-generation
b. second-generation
c. third-generation
d. digital-generation
Answer: Option B
Solution:
2. The frequency band designated for PCS in North America is:
a. 800 MHz
b. 900 MHz
c. 1.9 GHz
d. 12 GHz
Answer: Option C
Solution:
3. The “forward” PCS channel is:
a. from the base to the mobile
b. from the mobile to the base
c. from mobile to mobile
d. same as the uplink
Answer: Option A
Solution:
4. Compared to AMPS, PCS cell sites are:
a. bigger
b. smaller
c. distributed
d. higher-power
Answer: Option B
Solution:
5. AMPS was designed for:
a. POTS
b. voice
c. use built into an automobile
d. all of the above
Answer: Option D
Solution:
6. The number of competing PCS systems in North America is:
a. 2
b. 3
c. 4
d. many
Answer: Option B
Solution:
7. CDMA technology was invented by:
a. AT&T
b. Lucent
c. Bell Labs
d. Qualcomm
Answer: Option D
Solution:
8. GSM is used in:
a. Asia
b. Europe
c. North America
d. all of the above
Answer: Option D
Solution:
9. In GSM, voice channels are called:
a. traffic channels
b. voice channels
c. bearer channels
d. talking channels
Answer: Option A
Solution:
10. AMPS uses:
a. CDMA
b. TDMA
c. spread-spectrum
d. none of the above
Answer: Option D
Solution:
11. Other things being equal, battery life in a GSM phone should be:
a. less than in a TDMA phone
b. no better than in an AMPS phone
c. greater than in a TDMA phone
d. no better than a TDMA phone
Answer: Option C
Solution:
12. It is necessary to send control information on traffic channels in:
a. no PCS system
b. GSM only
c. TDMA only
d. both GSM and TDMA
Answer: Option D
Solution:
13. GSM uses:
a. frequency hopping
b. direct-sequence modulation
c. CDMA
d. all of the above
Answer: Option A
Solution:
14. In GSM, SIM stands for:
a. Short Inbound Message
b. Subscriber-Initiated Message
c. Subscriber ID Module
d. Subscriber ID Method
Answer: Option C
Solution:
15. IMSI stands for:
a. Integrated Mobile Subscriber Identification
b. International Mobile Subscriber Identification
c. Interim Mobile Subscriber Identification
d. Intermodulation System Interference
Answer: Option B
Solution:
16. IS-95 uses:
a. frequency hopping
b. TDMA
c. CDMA
d. all of the above
Answer: Option C
Solution:
17. IS-136 uses:
a. frequency hopping
b. TDMA
c. CDMA
d. all of the above
Answer: Option B
Solution:
18. In CDMA:
a. all frequencies are used in all cells
b. each cell uses half the available frequencies
c. each cell is assigned a frequency by the base
d. the frequency is selected by the mobile phone
Answer: Option A
Solution:
19. CDMA uses a set of PN sequences that are:
a. common
b. unique
c. rotating
d. orthogonal
Answer: Option D
Solution:
20. The next generation of PCS is expected to have:
a. faster data rates
b. Internet access
c. wider roaming area
d. all of the above
Answer: Option D
Solution:
COMPLETION
1. PCS stands for ____________________ Communications System.
Answer: personal
Solution:
2. Current PCS systems are called ____________________-generation systems.
Answer: second
Solution:
3. In North America, PCS is assigned the ____________________-MHz band.
Answer: 1900
Solution:
4. Compared to AMPS, PCS cells are ____________________ in size.
Answer: smaller
Solution:
5. Besides TDMA and CDMA, ____________________ is also used in North America for PCS.
Answer: GSM
Solution:
6. The spread-spectrum technique used in IS-95 PCS is ____________________.
Answer:
CDMA
direct sequence
Solution:
7. The spread-spectrum technique used in GSM is _________________________.
Answer: frequency hopping
Solution:
8. Unlike AMPS, CDMA allows for a ____________________ handoff.
Answer: soft
Solution:
9. The orthogonal PN sequences used in CDMA are called a ____________________ code.
Answer: Walsh
Solution:
10. Unlike other systems, in CDMA ____________________ frequencies are used in all cells.
Answer: all
Solution:
11. PN stands for Pseudo-____________________ Noise.
Answer: random
Solution:
12. ____________________ diversity is inherent in any spread-spectrum system.
Answer: Frequency
Solution:
13. RF channel S/N ratios ____________________ than zero are typical in CDMA systems.
Answer: less
Solution:
14. CDMA uses a ____________________-rate vocoder.
Answer: variable
Solution:
15. A phone user typically talks less than ____________________% of the time during a conversation.
Answer: 50
Solution:
16. CDMA requires ____________________-loop power control to work properly.
Answer: closed
Solution:
17. GPRS stands for General ____________________ Radio Service.
Answer: Packet
Solution:
18. IMT stands for International ____________________ Telecommunications.
Answer: Mobile
Solution:
19. UPT stands for ____________________ Personal Telecommunications.
Answer: Universal
Solution:
20. UWT stands for Universal ____________________ Telecommunications.
Answer: Wireless
Solution:
21. W-CDMA stands for ____________________ CDMA.
Answer: Wideband
Solution:
SHORT ANSWER
1. What is the advantage of a “soft” handoff?
Answer: No calls are dropped.
Solution:
2. If CDMA receivers hear all frequencies all the time, how do they pick a specific frequency?
Answer: Each frequency is modulated using a separate orthogonal PN sequence. To demodulate, the receiver uses the PN sequence specific to the channel it wants.
Solution:
3. What is the effect of cochannel interference in CDMA?
Answer: It increases the background noise level, but CDMA can tolerate a lot of such noise.
Solution:
4. How does GSM achieve frequency diversity?
Answer: It uses limited frequency hopping.
Solution:
5. Why was PCS assigned to 1.9 GHz instead of the 800-MHz band used for AMPS?
Answer: The 800 MHz band was already overcrowded.
Solution:
6. Why would a battery in a GSM phone be expected to last longer than a battery in a TDMA phone?
Answer: A TDMA phone is active during one out of every three time slots. A GSM phone is active during one out of every eight.
Solution:
7. What is the advantage of using offset QPSK over standard QPSK?
Answer: With standard QPSK, the transmitted power repeatedly goes to zero. With offset QPSK, it never goes to zero. Linearity requirements are less strict for offset QPSK transmitters.
Solution:
8. What is the “near/far” effect in CDMA, and what causes it?
Answer: A stronger station farther away can “drown out” a weaker station that is near. This happens when the power transmitted by mobile units is not well controlled by the base.
Solution:
Complete List of MCQ in Electronic Communication Systems by Blake
P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.
“Will you subscribe today via YOUTUBE?”
TIRED OF ADS?
- Become Premium Member and experienced fewer ads to ads-free browsing.
- Full Content Access Exclusive to Premium members
- Access to PINOYBIX FREEBIES folder
- Download Reviewers and Learning Materials Free
- Download Content: You can see download/print button at the bottom of each post.
PINOYBIX FREEBIES FOR PREMIUM MEMBERSHIP:
- CIVIL ENGINEERING REVIEWER
- CIVIL SERVICE EXAM REVIEWER
- CRIMINOLOGY REVIEWER
- ELECTRONICS ENGINEERING REVIEWER (ECE/ECT)
- ELECTRICAL ENGINEERING & RME REVIEWER
- FIRE OFFICER EXAMINATION REVIEWER
- LET REVIEWER
- MASTER PLUMBER REVIEWER
- MECHANICAL ENGINEERING REVIEWER
- NAPOLCOM REVIEWER
- Additional upload reviewers and learning materials are also FREE
FOR A LIMITED TIME
If you subscribe for PREMIUM today!
You will receive an additional 1 month of Premium Membership FREE.
For Bronze Membership an additional 2 months of Premium Membership FREE.
For Silver Membership an additional 3 months of Premium Membership FREE.
For Gold Membership an additional 5 months of Premium Membership FREE.
Join the PinoyBIX community.