Bharat Sanchar Nigam Ltd Question-Paper Contributed by Admin updated on Jun 2020
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BSNL GE JTO-Recruitment Examination  

 Test Paper -VIII

  •  When a inductive coil connected to a 200 V, 50Hz ac supply with 10A current flowing through it dissipates 1000 watts then which of the following will have least value in ohms-

    a.) Resistance

    b.)  Reactance

    c.) Impedance

    d.) None

     

  •  Oscillator crystal are made of –

    a.) Silicon

    b.) Germanium

    c.) Quartz

    d.) None

  •  For small size, high frequency coils, the most common core material is-

    a. )Air

    b. )Ferrite

    c.) Powdered ion

    d.) Steel

  •  If we have a parallel plate capacitor of plate area 'A' and plate separatoin t and having a capacity C and a metallic plate r of area A and of negligible thickness is introduced in the capacitor at a distance   from either of the two plates as shown in the given figure then the capacity of the capacitor will become –

    a.)  

    b.) C

    c.) 2C

    d.) 4C

  •  A superconductor is a –

    a.) A material showing perfect conductivity and Meissner effect below a critical temperature

    b.) A conductor having zero resistance

    c.) A perfect conductor with highest di-magnetic susceptibility

    d.) A perfect conductor which becomes resistance when the current density through it exceeds a critical value

     

  •  When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be –

    a) 8.05 pF

    b) 10.05pF

    c.) 16.01pF

    d.) 20.01pF

  •  Sparking occur when a load is switched off because the circuit has high –

    a.) Inductance

    b.) Capacitance

    c.) Resistance

    d.) None

  •  Sparking between contacts can be reduced by inserting a –

    a.) Resistance in the line

    b.) Capacitor in series with contacts

    c.) Capacitor in parallel with contacts

    d.) None

  •  RF amplifier of an A.M. receiver is normally biased in –

    a.) Class 'A'

    b.) Class 'b'

    c.) Class 'C'

    d.) None

  •  The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be –

    a.) High positive

    b.) High negative

    c.) Low positive

    d.) Zero

  •  The input gate current of a FET is –

    a.) a few microamperes

    b.) negligibly small

    c.) a few milliamperes

    d.) a few amperes

  •  In the following fig. with R = 30k, the value of current through 2 K resistor is –

    a.) 25 mA

    b.) 40 mA

    c.) 25/16 mA

    d.) 10 mA

  •  A step recovery diode –

    a.) has on extremely short recovery time

    b.) conducts equally well in both directions

    c.) is mainly used as a harmonic generator

    d.) is an ideal rectifiers of high frequency signals

  •  In order to get maximum undistorted output signal from CE amplifier with VCC 10V, the value of VCE (Q) should be approximately-

    a.) 0.1V

    b.) 5V

    c.) 10V

    d)

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