# 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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

5 A

Explanation :
No Explanation available for this question

1.  1/16 F

2.  1/12 F

3.  1/8F

4.  1/4 F

4