1) Inter system Handoffs are done
a. When mobile station moves in two cellular systems with different MSC
b. When mobile station moves between two cellular systems
c. When mobile station receives more power from other base station than the serving base station
d. All of the above
|
2) When a fraction of assigned channel is reserved for handoffs, it is
a. Guard channel concept
b. Fixed channel assignment
c. Dynamic channel assignment
d. None of the above
|
3) While handoffs, the termination of call may be avoided by
a. Providing Guard channel
b. Queuing of handoffs
c. Both a & b
d. None of the above
|
4) Dwell time is the time for
a. A call within the cell
b. Hand off
c. Waiting for channel allocation
d. None of the above
|
5) Dwell time depends upon
a. Interference
b. Distance between the subscriber and the base station
c. Propagation of call
d. All of the above
|
6) In Mobile Assisted Handoff (MAHO), the handoff takes place when
a. The power received by the mobile station from other base station is more than the serving base station
b. The channel allocated is not available
c. The mobile station has no signal
d. All of the above
|
Answer
Explanation
Related Ques
|
ANSWER: The power received by the mobile station from other base station is more than the serving base station
Explanation:
No explanation is available for this question!
|
|
7) Mobile Assisted Handoff (MAHO) provides
a. Faster handoffs
b. Suitability for frequent handoffs
c. MSC need not monitor the signal strength
d. All of the above
|
8) Trunking in a cellular network refers to
a. Termination of a call
b. Spectrum unavailability
c. Accommodating large number of users in limited spectrum
d. All of the above
|
Answer
Explanation
Related Ques
|
ANSWER: Accommodating large number of users in limited spectrum
Explanation:
No explanation is available for this question!
|
|
9) When all of the radio channels are in use in a trunking system
a. The user is blocked
b. The access to the system is denied
c. The queue may be provided
d. All of the above
|
10) Umbrella cell approach
a. Uses large and small cells
b. Uses different antenna heights
c. Is used for high speed users with large coverage area and low speed users with small coverage area
d. All of the above
|
11) Interference in cellular systems is caused by
a. Two base stations operating in same frequency band
b. Two calls in progress in nearby mobile stations
c. Leakage of energy signals by non cellular systems into cellular frequency band
d. All of the above
|
12) Interference in frequency bands may lead to
a. Cross talk
b. Missed calls
c. Blocked calls
d. All of the above
|
13) Co-channel reuse ratio depends upon
a. Radius of the cell
b. Distance between the centers of the co channel cells
c. Frequency allocation of nearest cells
d. Both a and b
e. Both b and c
|
14) Increase in Co- channel reuse ratio indicates
a. Better transmission quality
b. Larger capacity
c. Low co-channel interference
d. Both a and c
e. Both a and b
|
15) Grade of service refers to
a. Accommodating large number of users in limited spectrum
b. Ability of a user to access trunked system during busy hour
c. Two calls in progress in nearby mobile stations
d. High speed users with large coverage area
|
Answer
Explanation
Related Ques
|
ANSWER: Ability of a user to access trunked system during busy hour
Explanation:
No explanation is available for this question!
|
|
16) Traffic intensity is expressed in
a. Erlangs /MHz /km2
b. Erlangs
c. λ/ sec
d. dB/sec
|
17) The techniques used to improve the capacity of cellular systems are
a. Splitting
b. Sectoring
c. Coverage zone approach
d. All of the above
|
18) Distributed antenna systems are used at
a. Transmitters of mobile systems
b. Transmitters of base stations
c. Inputs and outputs of repeaters
d. Receivers of mobile stations
|
19) Antenna down tilting refers to
a. Focusing radio energy towards ground
b. Decreasing the strength of antenna
c. Decreasing the S/N ratio at the antenna input
d. All of the above
|
20) Diffraction, at high frequencies, depends upon
1. Geometry of the object
2. Polarization of the incident wave
3. Amplitude of the incident wave
4. Frequency of the incident wave
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. All are correct
|
21) The rainbow pattern seen on a CD is an example of
a. Reflection
b. Refraction
c. Diffraction
d. None of the above
|
22) Fresnel Reflection Coefficient is a factor of
1. Polarization of the wave
2. Properties of the material at which reflection occurs
3. Angle of incidence of wave
a. 1 and 2 are correct
b. 1 and 3 are correct
c. All the three are correct
d. 2 and 3 are correct
|
23) When a wave falls on a perfect conductor
a. Wave is partially reflected and partially transmitted
b. All incident energy is reflected back without loss of energy
c. Part of energy gets absorbed
d. Both a and c
|
Answer
Explanation
Related Ques
|
ANSWER: All incident energy is reflected back without loss of energy
Explanation:
No explanation is available for this question!
|
|
24) Brewster angle is the angle at which
a. No reflection occurs at the first medium
b. Reflection coefficient is zero
c. The wave gets refracted in the direction of source
d. Both a and b
e. Both a and c
|
25) Fading is caused due to
1. Multi path propagation
2. Obstacles
3. Frequency variations at the source
4. Variation in amplitude and phase at receiver
a. 1 and 2 are correct
b. 1, 2 and 4 are correct
c. 2 and 3 are correct
d. All are correct
|
26) Coherence time refers to
a. Time required to attain a call with the busy base station
b. Time required for synchronization between the transmitter and the receiver
c. Minimum time for change in magnitude and phase of the channel
d. None of the above
|
Answer
Explanation
Related Ques
|
ANSWER: Minimum time for change in magnitude and phase of the channel
Explanation:
No explanation is available for this question!
|
|
27) Fading due to shadowing is
a. Fading due to large obstructions
b. Large coherence time of the channel as compared to the delay constraints
c. Small coherence time of the channel as compared to the delay constraints
d. Both a and b
e. Both a and c
|
28) Deep fade is
1. Strong destructive interference
2. Drop in signal to noise ratio
3. Temporary failure of message transfer
a. 1 and 2 are correct
b. 1 and 3 are correct
c. 2 and 3 are correct
d. All are correct
|
29) Doppler spread refers to
a. Signal fading due to Doppler shift in the channel
b. Temporary failure of message transfer
c. Large coherence time of the channel as compared to the delay constraints
d. All of the above
|
Answer
Explanation
Related Ques
|
ANSWER: Signal fading due to Doppler shift in the channel
Explanation:
No explanation is available for this question!
|
|
30) Friis free space equation
1. Is an expression for noise power
2. Is a function of transmitting and receiving antenna gain
3. Depends upon the distance between transmitting and receiving antenna
a. 1 and 2 are correct
b. 1 and 3 are correct
c. 2 and 3 are correct
d. All are correct
|
31) The free space model of propagation refers to
1. Unobstructed line of sight between the transmitter and receiver
2. Satellite communication systems and Microwave line of sight radio links
3. Propagation along the ground surface
a. 1 and 2 are correct
b. 1 and 3 are correct
c. 2 and 3 are correct
d. All the three are correct
|
32) According to Friis free space equation
1. Received power falls with square of the distance between the transmitter and receiver
2. Increases with square of the distance between the transmitter and receiver
3. Received power increases with gains of transmitting and receiving antennas
a. 1 and 2 are correct
b. 1 and 3 are correct
c. All the three are correct
d. 2 and 3 are correct
|
33) EIRP is
1. Effective Isotropic Radiated Power
2. Maximum radiated power available by the transmitter
3. A factor of power and gain of transmitter
a. 1 and 2 are correct
b. 1 and 3 are correct
c. All the three are correct
d. 2 and 3 are correct
|
34) Spread spectrum modulation involves
1. PN sequence for modulation
2. Large bandwidth
3. Multiple users
a. 1 and 2 are correct
b. 1 and 3 are correct
c. 2 and 3 are correct
d. All the three are correct
|
35) PN sequence at the decoder acts as a locally generated carrier at the receiver and decodes the signal using
a. Correlator
b. Adder
c. Frequency divider
d. PLL
|
36) In spread spectrum technique, the multiple users are assigned with
a. Same spectrum and same PN code
b. Same spectrum and different PN code
c. Different spectrum and different PN code
d. Different spectrum and same PN code
|
37) Advantage of using Spread Spectrum modulation is/are
1. Interference rejection capability
2. Frequency planning is not required
3. Resistance to multipath fading
4. ISI is lesser
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. All the four are correct
|
38) Direct sequence spread spectrum demodulation uses
a. DPSK
b. FSK
c. ASK
d. QPSK
|
39) Fast hopping is
a. More than one frequency hop during each symbol
b. Hopping rate greater than or equal to information symbol rate
c. One or more symbols transmitted between frequency hops
d. Both a and b
e. Both b and c
|
40) Slow frequency hopping refers to
a. One or more symbols transmitted in time interval between frequency hops
b. More than one frequency hop during each symbol
c. Hopping rate greater than or equal to information symbol rate
d. Both a and c are correct
|
Answer
Explanation
Related Ques
|
ANSWER: One or more symbols transmitted in time interval between frequency hops
Explanation:
No explanation is available for this question!
|
|
