Tag Archives: JTO

Here is BSNL JTO previous year paper held on 24 june 2008, paper may not be complete but these were the questions that were asked .

1. 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

2.  Oscillator crystal are made of
a.) Silicon      b.) Germanium      c.) Quartz     d.) None

3. For small size, high frequency coils, the most common core material is-
a. )Air       b. )Ferrite        c.) Powdered ion        d.) Steel

4. 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

5. 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

6. 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

7. Sparking occur when a load is switched off because the circuit has high
a.) Inductance     b.) Capacitance        c.) Resistance      d.) None

8. 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

9. RF amplifier of an A.M. receiver is normally biased in
a.) Class ‘A’     b.) Class ‘b’        c.) Class ‘C’     d.) None

read more »