In the Figure below , the current of 1 ampere flows through the resistance of

1.  4 ohms

2.  20 ohms

3.  30 ohms

4.  12 ohms

View Answer  
4
Correct Answer :

12 ohms


Explanation :
No Explanation available for this question

Two coils in differential connection have self-inductance of 2 mH and a mutual inductance of 0.15 mH . The equivalent inductance of the combination is

1.  5.7 mH

2.  5.85 mH

3.  6 mH

4.  6.15 mH

View Answer  
4
Correct Answer :

5.7 mH


Explanation :
No Explanation available for this question

In the network shown in the figure , the effective resistance faced by the voltage source is

1.  4 Ω

2.  3 Ω

3.   2 Ω

4.  1 Ω

View Answer  
4
Correct Answer :

3 Ω


Explanation :
No Explanation available for this question

In the circuit shown in the given figure , the values of I(0+) and I(∞) , will be respectively

1.  Zero and 1.5 A

2.  1.5 A and 3 A

3.  3 A and zero

4.  3 A and 1.5 A

View Answer  
4
Correct Answer :

3 A and zero


Explanation :
No Explanation available for this question

For the circuit shown in the given figure , when the switch is at position A , the current i(t) = I sin (ωt + 300) A . When switch is moved to position B at time t = 0 , the power dissipated at the switching in resister R remains unchanged The value of I and the element X would respectively , be

1.  1 A and resistor

2.  1 A and capacitor

3.  3 A and resistor

4.  4 A and capacitor

View Answer  
4
Correct Answer :

4 A and capacitor


Explanation :
No Explanation available for this question

A two terminal black box contains one of the R.L.C. elements .The black box is connected to a 220 volts A.C .supply . The current through the sources is I. When a capacitance of 0.1 F is inserted in the series between the source is 2I . The element is

1.  a resistance

2.  an inductance

3.  a capacitance of 0.5 F

4.  it is not possible to determine the element

View Answer  
4
Correct Answer :

an inductance


Explanation :
No Explanation available for this question

A resistance ‘R’Ω and inductance of ‘L’ H are connected across 240 V , Hz supply . power dissipated in the circuit is 300 W and the voltage across R is 100 V. In order to improve the power factor to unity , the capacitor that is to be connected in series should have a value of

1.  43.7  μF

2.  4.37  μF

3.  437  μF

4.   4.37  μF

View Answer  
4
Correct Answer :

43.7  μF


Explanation :
No Explanation available for this question

In the transformer shown in the given figure , the inductance measured across the terminal 1 and 2 was 4 H with open terminals 3 and 4 . It was 3 H when the terminal 3 and 4 are were short circuited . The coefficient of coupling would be

1.  1

2.  0.707

3.  0.5

4.  Indeterminate due to insufficient data

View Answer  
4
Correct Answer :

Indeterminate due to insufficient data


Explanation :
No Explanation available for this question

Five cells are connected in series in row and then four such rows are connected in parallel to feed the current to resistive load of 1.25 Ω . Each cell has emf of 1.5 V with internal resistance of 0.2Ω . The current through the load will be

1.  3.33 A

2.  23.33 A

3.  5 A

4.  1 A

View Answer  
4
Correct Answer :

5 A


Explanation :
No Explanation available for this question

The value of the capacitance C in the given AC circuit to make it a constant resistance circuit OR for the supply current to be independent of its frequently is

1.  1/16 F

2.  1/12 F

3.  1/8F

4.  1/4 F

View Answer  
4
Correct Answer :

1/16 F


Explanation :
No Explanation available for this question
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