# Placement Papers - BSNL

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### JTO 2005 EXAM SOLVED PAPER OF YEAR 2005 (BSNL)

Posted By : Anshuma Chugh Rating : +25, -1

Paper : JTO 2005 EXAM SOLVED PAPER OF YEAR 2005 (BSNL)

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

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

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

In a 3 phase full converter if load current is I and ripple free, then average thyristor current is-
a)
b)
c)
d)

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

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

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

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

For coupling purposes in RF amplifier a buffer amplifier is used because it provides-

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

a) 110 MHz
b) 112 Hz
c) 114 MHz
d) 120 MHz

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

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

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

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

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

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