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STEEL AUTHORITY OF INDIA LIMITED

SAIL Management Trainee

Electronics & Communication 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.Current I0 in the given circuit will be

• 10 A
• 3.33 A
• 20 A
• 2.5 A

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

• zero
• unity
• 0.5
• 1.5

Q.4.In the given circuit voltage V is reduced to half. The current will become

• I/2
• 2 I
• 1.5 I
• I / √R2 + (XL + XC)2

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    (Ans)

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

• Aluminium
• Boron
• Phosphorous
• 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.The following Figure represents

• LED
• Varistor
• SCR
• Diac

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.The number of digits in octal system is?

• 8
• 7
• 8 or 7
• 10

Q.17.The number of digits in hexadecimal system is?

• 15
• 10
• 16
• 8

Q.18.The number of bits in a nibble is?

• 8
• 2
• 4
• 16

Q.19.The digit F in hexadecimal system is equivalent to number...........in decimal system?

• 16
• 15
• 17
• 8

Q.20.Which of the following binary number is equivalent to BCD?

• 1010
• 1000
• 1001
• None of these

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