CBSE-NET 2017 EC Exam: Practice Quiz 2

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Question 1

In the following figure, the input impedance of the amplifier is

• A100 Ohm
• B500 Ohm
• C1000 Ohm
• D1500 Ohm

Question 2

The time constant of the circuit shown in Fig. when the switch is closed………..

• A 2 seconds
• B0.5 second
• C5 seconds
• D1.5 seconds

Question 3

The resistance of an ammeter having range 0-5 A is .8 Ω What is the effective current when the pointer reads 2 A?

An ammeter has a current range of 0-5 A, and its internal resistance is 0.2 Ω. Inorder to change the range to 0-25 A, we need to add a resistance o

• A
  0.8 Ω in series with the meter
• B
  1.0 Ω in series with the meter
• C
  0.04 Ω in parallel with the meter
• D
  0.05 Ω in parallel with the meter

Question 4

The phase voltage in a 3-phase circuit is and the corresponding phase current is What is the phase reactive power?

• A
• B
• C
• D

Question 5

Number of real values of (a +ib)^1/n+(a-ib)^1/n

• A0
• B1
• Cn
• DNone of these

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