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BSNL JTO Exam Paper 2005

Posted by Editor
February 15, 2008

In the RF amplifier stage cascade (CE-CB) amplifier is used because it gives-
a) Large voltage gain
b) Low output impedance
c) Large isolation between the input and the output
d) None of the above
Answer: c)

Silicon diode is less suited for low voltage rectifier operation because-
a) it can withstand high temperature
b) ensures low PIV of the diodes
c) ensures lower values of capacitance in the filter
d) reduces ripple content
Answer: a)

An amplifier of class A is that in which -
a) Base is biased to cut – off
b) Ic flows most of the time
c) Ie flows all the time
d) Vc often raises to Vcc
Answer: c)

A transistor is in active region when-
a) IB = bIC
b) IC=bIB
c) IC=IE
d) IC=IB
Answer: a)

For coupling purposes in RF amplifier a buffer amplifier is used because it provides-
a) Maximum loading and minimum mismatch
b) Minimum loading and minimum mismatch
c) Maximum loading and maximum mismatch
d) Minimum loading and maximum mismatch
Answer: b)

A transistor has CE parameter as hie = 10kW, hre =20 x 10-4 , hse = 100, hoe = 25 ms. The hib for this transistor will be-
a) 100 W
b) 99.01 W
c) 5m W
d) 101kW
Answer: b)

An FM radio receiver is tuned to a 90.6 MHz broadcast station. It will receive an image frequency of -
a) 110 MHz
b) 112 Hz
c) 114 MHz
d) 120 MHz
Answer: b)

In the given fig RL is shorted out, then VCE will become-
Given RL Figure
a) OV
b) VCC – IBRB
c) Equal to VCC
d) None of the above
Answer c)

See the circuit shown and choose the correct option –
Circuit
a) Only red will glow
b) Only green will glow
c) Both red and green will glow
d) Neither red nor green will glow
Answer: a)

A dc to dc converter having an efficiency of 80% is delivering 16W to a load) If the converter is generating an output of 200V from an input source of 20V, then the current drawn from the source will be –
a) 0.1A
b) 0.5A
c) 1.0A
d) 10.0A
Answer: c)

A transistor is operated as a non-saturated switch to eliminate –
a) storage time
b) turn – off time
c) turn – on time
d) delay time
Answer: b)

The output Y of the circuit in the given figure is –
Out put Y Circuit
a) (A + B)C + DE
b) AB + C(D + E)
c) (A + B)C + D + E
d) (AB + C) . DE
Answer: a)

Rotors used in a two-phase ac servomotor is –
a) solid iron motor
b) squirrel cage rotor
c) drag cup rotor
d) both b and c
Answer: d)

Major advantage of TWT over a klystron lies in its –
a) higher bandwidth
b) higher output
c) higher frequency
d) higher gain
Answer: d)

The op-map circuit shown in the given figure can be used for –
OP-MAP Circuit
a) addition
b) subtraction
c) both addition and subtraction
d) multiplication
Answer: d)

The Boolean expression for the shaded area in the given Venn diagram is –
Venn Diagram
Answer: AB+BC+CA

A lag compensator is basically a –
a) high pass filter
b) band pass filter
c) low pass filter
d) band elimination filter
Answer: c)

Transfer function T (S) of the system in the given fig is-
Transfer Function T
Answer: Transfer Function T

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
Answer: d)

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
Answer: d)

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
Answer: c)

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
c) compradors
d) repeaters.
Answer: d)

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
Answer: c)

Mark out transferred electron device in the following-
a) BARITT dived
b) IMPATT dived
c) Gunn divde
d) Step recovery diode
Answer: c)

In the output of a normal monochrome receiver video detector voltages, which are not found, are -
a) syne
b) video
c) sweep
d) sound
Answer: c)

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
Answer: c)

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 –
Answer: (D12+D22)/x

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
Answer: c)

Iris is used to –
a) Over come power loss
b) Over come bending effect
c) Over come mismatch error
d) Over come twist effect
Answer: c)

In schotty barrier diode current flows because of –
a) Majority carriers
b) Minority carriers
c) Majority and minority carriers
d) None
Answer: b)

Which antennas are used in microwave communication –
a) long wave antennas
b) Rhombic antennas
c) Parabolaidal antennas
d) All of above
Answer: c)

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
Answer: a)

No of T-state required for memory read or write operation-
a) 2
b) 3
c) 4
d) 6
Answer: b)

In data transfer operation which flag get affected-
a) 3140 flog.
b) carry flog
c) sign flog.
d) none
Answer: d)

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
d) none

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.
Answer: a)

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
Answer: a)

Program execution hierarchy decides which operator-
a) is most important
b) is used first
c) is fastest
d) operators on largest number
Answer: c)

(375)10 = (—-)8
a) 550
b) 557
c) 567
d) 577
Answer: c)

BSNL JTO EXAM 2008 Syllabus is here

From Placement Papers, post BSNL JTO Exam Paper 2005

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