The flow rate of electrically conducting liquid without any suspended particle cannot be measured by ?
a) turbine flow meters
b) electromagnetic flow meters
c) ultrasonic flow meters
d) thermistor based heat loss flow meters
Answer: d)
The most useful transducer for displacement sensing with excellent sensitivity, linearity and resolution is ?
a) an incremental encoder
b) an abosolute encoder
c) LVDT
d) a strain gauge
Answer: c)
When variable reluctance type tachometer has 150 teeth on the rotor & the counter records 13,500 pulses per second then the rotational speed will be?
a) 4800 rpm
b) 5400 rpm
c) 6000 rpm
d) 7200 rpm.
Answer: b)
41. On a voltage scale, zero dB m in a 600-ohm system could refer to ?
a) 1.732 V
b) 1.0 V
c) 0.7746 V
d) 0.5V
Answer: b)
One of the following devices which is required in addition in order to measure pressure using LVDT is-
a) strain gauge
b) pitot tube
c) Bourden tube
d) Rotameter
Answer: c)
It is required to measure temperature in the range of 13000 C to 15000 c) The most suitable thermocouple to be used as a transducer would be ?
a) chromel - constantan
b) Iron - constantan
c) chromel - alumel
d) platinum- rhodium
Answer: d)
In a CSI if frequency of output voltage is f Hz, then frequency of input voltage to CSI is-
a) f
b) 2 f
c) f/2
d) 3 f
Answer: b)
Identify the type of chipper in the given circuit
a) Type A chopper
b) Type B chopper
c) Type C chopper
d) Type D chopper
Answer: b)
Maximum value of charging resistance in an UJT is associated with-
a) peak point
b) valley point
c) any point between peak and valley
d) after the valley point
Answer: a)
Thyristor A has rated gate current of 2A and thyristor B a rated gate current of 100 mA-
a) A is a GTO and B is a conventional SCR
b) B is a GTO and A is a conventional SCR
c) B may operate as a transistor
d) none of the above
Answer: a)
In a 3 phase full converter, the output voltage during overlap is equal to-
a) zero
b) source voltage
c) source voltage minus the inductance drop
d) average value of the conducting phase voltages
Answer: d)
Mark old the correct statement for Cycloconverters-
a) step-down Cycloconverter (CC) works on natural commutation
b) step up CC requires no forced commutation
c) load commutated CC works on line commutation
d) none of the above
Answer: a)
In a 3 phase full converter if load current is I and ripple free, then average thyristor current is-
a)
b)
c)
d)
Answer: b)1/3(I)
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-
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 ?
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 ?
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 ?
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 ?
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-
Answer:
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)
BSNL JTO Examination Solved Model Test Paper (Part-3)
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)
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)
To obtain 2048 8 memory using 128 8 memory chip how many IC required-
a) 2
b) 4
c) 8
d) 16
Answer: d)
A Decimal no. 17 can be converted in binary, the binary no. will be.-
a) 10001
b) 01110
c)00111
d) 11100
Answer: a)
Is the Universal logic gate-
a) AND
b) OR
c) NAND
d) X-OR
Answer: c)
A monostable state in multivibrator means-
a) which returns itself to its single stable state
b) the state used only once in circuit
c) the state of circuit can not get changed
d) the state of circuit always changing
Answer: a)
For designing binary counter which flip flop is preferred -
a) T FF
b) SR FF
c) D FF
d) JKFF
Answer: c)
His handwriting was not ?? so I could not read his note ?
a) attractive
b) eligible
c) clear
d) legible
Answer: d)
They started to ?? people into the theatre only at six -
a) enter
b) admit
c) follow
d) accept
Answer: a)
I told him to buy things that are lasting (Give the appropriate synonym of the underlined word).
a) ending
b) ordinary
c) durable
d) cheap
Answer: c)
Give the word which is most opposite in meaning of the word ?evident?-
a) doubtful
b) unimportant
c) disagreed
d) understood
Answer: a)
I expressed by disagreement ?? him on that issue-
a) between
b) with
c) about
d) for
Answer: b)
?Sugarbowl? of the world is -
a)
b)
c) Brazil
d)
Answer: b)
Palk strait separates-
a) India and Srilanka
b) India and Burma
c) Britain and France
d) Malaysia and Sumatra
Answer: a)
The minimum number of atoms in a molecule of an element are-
a) 1
b) 5
c) 2
d) 10
Tides in the sea are caused by-
a) Effect of sun
b) Effect of moon
c) combined effect of moon and sun
d) Gravitational, centrifugal and centripetal forces
Answer: c)
The Bar council of
a) 140
b) 200
c) 150
d) 100
Answer: c)
Aswan Dam is located in-
a)
b)
c) Sudan
d)
Answer: a)
Ghana Birds sanctuary is in the state of -
a)Rajasthan
b)Madhya Pradesh
c)Uttar Pradesh
d)
Answer: a)
Dry ice is-
a) Frozen carbon monoxide
b) Frozen carbon dioxide
c) Frozen ammonia
d) None of these
Answer: b)
East flower river of India is -
a) Cauvery
b) sone
c) Narmada
d) Tapti
Answer: a)
The total length of the great wall of China is ?
a) 1,400 miles
b) 1,500 miles
c) 1,300 miles
d) 1,400 miles
Answer: a)
Deficiency of vitamin C may result in-
a) beriberi
b) night blindness
c) dermatitis
d) Scurvy
Answer: d)
Bharat Shah a film financer was granted bail by Supreme Court after a
period of ?
a) 11 months
b) 2 years
c) 18 months
d) 15 months
Answer: d)
Indian local time is based on-
a) 800 E longitude
b) E longitude
c) 1100 E longitude
d) 250 E longitude
Answer: Can you Answer this?
Which one is a good preservative of food?
a) Spirit
b) Formaldehyde
c) Sugar
Answer: b)
In a 3 phase full converter, the output voltage during overlap is equal to-
a) zero
b) source voltage
c) source voltage minus the inductance drop
d) average value of the conducting phase voltages
Answer: d)
Mark old the correct statement for Cycloconverters-
a) step-down Cycloconverter (CC) works on natural commutation
b) step up CC requires no forced commutation
c) load commutated CC works on line commutation
d) none of the above
Answer: a)
In a 3 phase full converter if load current is I and ripple free, then average thyristor current is-
a)
b)
c)
d)
Answer: b)1/3(I)
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-
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 ?
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 ?
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)
