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BHARAT SANCHAR NIGAM LIMITED

Electrical / Electronics Engg

BSNL TTA / BSNL JTO Model Paper

Q.1.To neglect a voltage source, the terminals across the source are

• open circuited
• short circuited
• replaced by some resistance
• replaced by an inductor

Q.2.Which is a digital communication system ?

• FM
• AM
• PCM
• PAM

Q.3.In a resonant circuit, the power factor at resonance is

• zero
• unity
• 0.5
• 1.5

Q.4.In TV systems the frame frequency is

• 100
• 60
• 50
• 25

Q.5.The function          3 s           has
                        (s + 1) (s + 2)

• one zero, two poles
• no zero, one pole
• no zero, two poles
• one zero, no pole

Q.6.One electron volt is equivalent to

• 1.6 * 10-10 J
• 1.6 * 10-13 J
• 1.6 * 10-16 J
• 1.6 * 10-19 J

 Q.7.Which of the following is donor impurity element ?

• Aluminium
• Boron
• Phosphorous    (Ans)
• Indium.

Q.8.The diameter of an atom is of the order

• 10-6 m
• 10-10 m
• 10-15 m
• 10-21 m

Q.9.A transistor is basically an amplifying device for

• power
• voltage
• current
• all of these

Q.10.If the d.c. valve of a rectified output is 300 V & peak to peak ripple voltage is 10 V, the ripple factor is

• 1.18%
• 3.33%
• 3.36%
• 6.66%

Q.11.Full wave rectifier output has ripple factor of

• 1.11
• 1.21
• 1.41
• 1.51

Q.12.In a common base connection IE = 2 mA, IC = 1.9 mA. The value of base current is

• 0.1 m
• 0.2 mA
• 0.3 mA
• zero

Q.13.For the action of transistor the base region must be

• P-type material
• N-type material
• very narrow
• highly doped

Q.14.Compared to a CB amplifier the CE amplifier has higher

• current amplification
• output dynamic resistance
• leakage current
• input dynamic resistance
• all of the above

Q.15.When a transistor is biased to cut-off its Y is

• 0.5
• 0
• 1.0
• 0.8

Q.16.An ideal voltage amplifier should have

• Ri = 0,  R0 = 0
• Ri = 0,  R0 =Infinite
• Ri = Infinite,  R0 = 0
• Ri = 0,  R0 = Infinite

Q.17.Barichausen criterion for sustained oscillator is

• Aβ = 1
• Aβ = 0
• Aβ = -1
• A = 1/√β

Q.18. The value of plastic capacitance for a triode may range from

• 2 μF to 12 μF
• 20 μF to 120 μF
• 2 pF to 12 pF
• 20 pF to 120 pF

Q.19.A colpitts oscillator uses

• tapped coil
• inductive feedback
• tapped capacitance
• no tuned LC circuit

Q.20.A typical frequency for a RC feedback oscillator is

• 1 KHz
• 100 MHz
• 1000 MHz
• 1 GHz

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