# The circuit shown has i (t) =10 sin (120 πt). Thus power (time average power) dissipated in R is

1.  25 Watts

2.  100 watts

3.  10/√2 Watts

4.  50 Watts

4
Correct Answer :

25 Watts

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 Source is I. When a capacitance of 0.1F is inserted ill the series between the source and the box, the current through the source is 21. The element is

1.  a resistance

2.  an inductance

3.  a capacitance of 0.5F

4.  it is not possible to determine the element.

4
Correct Answer :

an inductance

Explanation :
No Explanation available for this question

# A resistance ‘R’ and inductance 'L' 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

4
Correct Answer :

43.7 µF

Explanation :
No Explanation available for this question

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

1.  1 A and resistor

2.  2 A and capacitor

3.  3 A and resistor

4.  4 A and capacitor

4
Correct Answer :

4 A and capacitor

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.  1.5A and 3 A

3.  3 A and zero

4.  3 A and 1.5 A

4
Correct Answer :

3 A and zero

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

4
Correct Answer :

indeterminate due to insufficient data

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 frequency is

1.  1/16 F

2.  1/12 F

3.  1/8 F

4.  ¼ F

4
Correct Answer :

1/16 F

Explanation :
No Explanation available for this question

# When two coupled coils of equal self-inductance are connected in series in one way the net inductance is 12 mH, and when they are connected in the other way, the net inductance is 4 mH, The maxiumum value of net inductance when they are connected in parallel in a suitable way is

1.  2 mH

2.  3 mH

3.  4 mH

4.  6 mH

4
Correct Answer :

3 mH

Explanation :
No Explanation available for this question

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

1.  3.33 A

2.  23.33 A

3.  5A

4.  1 A

4
Correct Answer :

5A

Explanation :
No Explanation available for this question

# In the circuit shown in the given figure, the current supplied by the sinusoidal current source I is

1.  28A

2.  4A

3.  20A

4.  not determinable from the data given

4
Correct Answer :

20A

Explanation :
No Explanation available for this question

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