Company: Bharat Sanchar Nigam Ltd
BSNL Junior Telecom Officers (JTO) Placement Paper 2014
Major advantage of TWT over a klystron lies in its ?
a) higher bandwidth
b) higher output
c) higher frequency
d) higher gain
The op-map circuit shown in the given figure can be used for ?
c) both addition and subtraction
The Boolean expression for the shaded area in the given Venn diagram is ?
A lag compensator is basically a ?
a) high pass filter
b) band pass filter
c) low pass filter
d) band elimination filter
Transfer function T (S) of the system in the given fig is-
The overall transfer function for a unity feedback system is 4/(S2+4S+4) Mark the correct statement regarding this system
1. Position error constant kp for the system is 4
2. The system type one.
3. The velocity error constant kv for the system is finite.
Select the correct answer using the codes given below Codes
a) 1,2 and 3 b) 1 and 2 c) 2 and 3 d) 1 and 3
If the rotor?s resistance and reactant?s are respectively R and X1 its length and diameter are L and D for two phase a) c) servomotor, then-
In a PID controllers the transfer function G(s) is-
Transfer function can be approximated by the system- The transfer function of an amplifier is given by The high 3 db frequency of an amplifier will be approximately-
a) 5850 kHz
b) 585 kHz
c) 5850 Hz
d) 585 Hz
Answer: X/R is small but L/D is large
The output signals amplitudes for 1?s and 0?s in an ADM transmission systems are ?
a) Fixed and the repetition rate is also fixed
b) Fixed but the repetition rate is variable
c) Variable and the repetition rate is also variable
d) Variable but the repetition rate is fixed
Microwave link repeaters are typically 50km apart ?
a) Because of atmospheric attenuation
b) Because of Output tube power limitations
c) Because of the earth?s curvature
d) To ensure that the applied ac voltage is not excessive
The amplifier inserted at intervals to amplify the signal and compensate for transmission loss on the cable are called-
a) line amplifier
b) equalizing amplifiers
Diversity reception in used to-
a) increase receiver sensitivity
b) improve receiver selectivity
c) overcome degrading effect of fading
d) overcome degrading effect of receiver detuning
Mark out transferred electron device in the following-
a) BARITT dived
b) IMPATT dived
c) Gunn divde
d) Step recovery diode
In the output of a normal monochrome receiver video detector voltages, which are not found, are –
The HV anode supply for the picture tube of TV receiver is generated in the-
a) mains transformer
b) vertical output stage
c) horizontal output stage
d) horizontal deflection oscillator
In antenna measurements using two aperture antennas of dimensions D1 and D2 , minimum separation between the two should be (x is free space wavelength of radiation uses) The frquency range for satellite broad casting is ?
The frquency range for satellite broad casting is
a) 30 MHz – 300MHz
b) 30 MHz – 3 GHz
c) 3 GHz – 30 GHz
d) 30 GHz – 300 GHz
Iris is used to ?
a) Over come power loss
b) Over come bending effect
c) Over come mismatch error
d) Over come twist effect
In schotty barrier diode current flows because of ?
a) Majority carriers
b) Minority carriers
c) Majority and minority carriers
Which antennas are used in microwave communication ?
a) long wave antennas
b) Rhombic antennas
c) Parabolaidal antennas
d) All of above
Among translator & time of sight system capacity ?
a) Of translator is more
b) Of line of sight is more
c) Having equal capacity
d) No relation such as
No of T-state required for memory read or write operation-
In data transfer operation which flag get affected-
a) 3140 flog.
b) carry flog
c) sign flog.
The storage and retrieval of data on stacks should follow sequence-
a) last in first out
b) first in first out
c) random in random out
In flowchart which figure represents process like subroutine-
| | | |
While executing program microprocessor checks INTR line clearing-
a) each instruction
b) after interval of two instruction
c) after a subroutine
d) at the end of program.
93. In which error check technique of data communication 2?s complement of all bytes of data is transmitted with data-
a) Even parity
b) odd parity
c) check scans
d) cyclic redundancy