1(a)(i)
The unit of current is _______

(a) Volt/sec (b) coulomb/sec (c) amp/sec (d) none of these

(a) Volt/sec (b) coulomb/sec (c) amp/sec (d) none of these

1 M

1(a)(ii)
Coulomb's second law is called as _______ law

(a) Inverse square (b) charge (c) induction

(a) Inverse square (b) charge (c) induction

1 M

1(a)(iii)
If the length of conductor is doubled and its cross sectional area is reduced to 50% then its resistance will be _______

(a) Same (b) doubled (c) increased by 4 times (d) reduced to a magnetic

(a) Same (b) doubled (c) increased by 4 times (d) reduced to a magnetic

1 M

1(a)(iv)
A conductor carries 10A in a direction perpendicular to a magnetic field of density 0.3T. If the length of conductor is 10 cm the force on the conductor F= _______

(a) 3N (b) 0.3N (c) 30N

(a) 3N (b) 0.3N (c) 30N

1 M

1(a)(v)
Amount of light produced by a lamp or the amount of heat
produced by an iron is proportional to the

(a) Square of RMS value (b) RMS value (c) square of average value (d) average value

(a) Square of RMS value (b) RMS value (c) square of average value (d) average value

1 M

1(a)(vi)
The three phase voltages are displaced by _______ radians
from each other.

(a) π/2 (b) π/3 (c) 2π/3 (d) π

(a) π/2 (b) π/3 (c) 2π/3 (d) π

1 M

1(a)(vii)
Define Lumens.

1 M

1(b)(i)
The resistance of a thin conductor is _______ as
compared to that of a thick conductor.

(a) Same (b) lower (c) higher

(a) Same (b) lower (c) higher

1 M

1(b)(ii)
The value of relative permittivity for Air is _______ .

1 M

1(b)(iii)
A magnetic circuit has mean length of 20 cm and cross sectional area of 1 cm

(a) 2*10

^{2}if the flux density is 2T then ϕ = _______ .(a) 2*10

^{-4}mWb (b) 2*10^{-4}Wb (c) 2*10^{-2}Wb (d) none of these
1 M

1(b)(iv)
Define RMS value.

1 M

1(b)(v)
Draw the phasor diagram of R-C series circuit.

1 M

1(b)(vi)
For a balanced delta load the _______ of all their line currents
is zero.

(a) Product (b) difference (c) sum (d) division

(a) Product (b) difference (c) sum (d) division

1 M

1(b)(vii)
Define A-H efficiency.

1 M

2(a)
Explain the effect of temperature on different metals.

3 M

2(b)
Explain Current and Voltage divider rule.

4 M

2(c)
Derive expression for delta to star conversion of resistive network.

7 M

3(a)
Derive the expression for the equivalent capacitance of capacitors connected in parallel.

3 M

3(b)
The equivalent capacitance of two capacitors when connected in
series is 0.03 μF & when connected in parallel is 0.16 μF. Find the capacitance of both the capacitors.

4 M

3(c)
Three capacitors having capacitances of 10 μF, 20 μF and 40 μF are connected in series to a 400 V d.c. source. Find (i) Total
capacitance (ii) Total charge in circuit (iii) Total energy stored.

7 M

4(a)
Explain Magnetic Hysteresis phenomena using hysteresis loop.

3 M

4(b)
State similarities between magnetic circuit and electrical circuit.

4 M

4(c)
Define co-efficient of coupling. Derive the relation between self
and mutual inductance.

7 M

5(a)
Three currents are represented by i

_{1}= 10sinwt, i_{2}= 20sin(wt-π/6) ,i_{3}= 30sin(wt+π/4) . Find magnitude and phase angle of resultant current of their addition.
3 M

5(b)
An inductive coil draws 10 A current and consume 1 KW power
from a 200V, 50Hz, Ac supply determine (1) the impedance in
Cartesian and polar form (2) power factor (3) reactive and apparent power.

4 M

5(c)
Prove the condition of resonance for series R-L-C AC circuit. Also
analyze the phenomena with the help of graph.

7 M

6(a)
Give advantages of Two Wattmeter Method.

3 M

6(b)
For a balanced delta connected load supplied at 3-phase, 400 V ac supply, the two wattmeter readings are: 7.8kW and ??? 2.55kW. Find out load power factor & line current.

4 M

6(c)
Establish relation between line voltage & phase voltage and current relation in 3-phase star connection. Draw phasor diagram.

7 M

7(a)
Classify various types of Lighting scheme and explain any two.

3 M

7(b)
State types of Fuse and explain any one.

4 M

7(c)
Explain construction of cable in detail.

7 M

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