Part C
11. a) State and Explain Kirchoff’s laws.
b) In the network shown in figure find the voltage across AB
Or
12.a)Distinguish between electric and magnetic circuit.
b) A magnetic core in the form of closed ring has a mean length of 20cm and a cross section of
1cm².The μr of iron is 2400.What current will be needed in a coil of 2000 turns uniformly wound
round the ring to create a flux of 0.2mWb in the iron.If an air gap of 1mm is cut through the core
perpendicular to the direction of this flux , what will be the current needed to maintain the small
flux in the gap?
13.a) Distinguish between statically induced emf and dynamically induced emf.
b) From the fundamentals derive an expression for the average power in an ac circuit.
Or
14.a) For the circuit shown in figure find the total impedance , current power and power factor.
15.a) Explain the different types of DC generators.
b) A 400V shunt motor has an armature resistance of 0.8Ω and field resistance of 200Ω.
.Determine the back emf when giving an output of 7.46kW at 80% efficiency.
Or
16.a) What are the losses in a transformer ? On what factors these losses depend?
b) A 25kVA transformer has 500 turns on the primary and 50 turns on the secondary windings. The
Primary is connected to 3000V, 50Hz supply. Find the full load primary and secondary currents,
the secondary emf and the maximum flux in the core. Neglect the leakage drops and the no load
primary current.
17.a) Obtain the relation between line and phase voltages and currents in star connected system
b) A 220V 3 phase voltage is applied to a balanced delta connected 3 phase load of phase
Impedance (15+j20) Ω.
i) Find the phasor current in each line
ii) The power consumed /phase
iii) Draw the phasor diagram
Or
18.a) Why a single phase induction motor is not self starting?
b) Describe the different rotor constructions in an alternator.
19) Describe the various non conventional energy sources.
Or
20.a) Explain the working principle of mercury vapor lamp.
b) Explain the energy management techniques applied to a residential building.
(5 × 12 =60 marks)
11. a) State and Explain Kirchoff’s laws.
b) In the network shown in figure find the voltage across AB
Or
12.a)Distinguish between electric and magnetic circuit.
b) A magnetic core in the form of closed ring has a mean length of 20cm and a cross section of
1cm².The μr of iron is 2400.What current will be needed in a coil of 2000 turns uniformly wound
round the ring to create a flux of 0.2mWb in the iron.If an air gap of 1mm is cut through the core
perpendicular to the direction of this flux , what will be the current needed to maintain the small
flux in the gap?
13.a) Distinguish between statically induced emf and dynamically induced emf.
b) From the fundamentals derive an expression for the average power in an ac circuit.
Or
14.a) For the circuit shown in figure find the total impedance , current power and power factor.
15.a) Explain the different types of DC generators.
b) A 400V shunt motor has an armature resistance of 0.8Ω and field resistance of 200Ω.
.Determine the back emf when giving an output of 7.46kW at 80% efficiency.
Or
16.a) What are the losses in a transformer ? On what factors these losses depend?
b) A 25kVA transformer has 500 turns on the primary and 50 turns on the secondary windings. The
Primary is connected to 3000V, 50Hz supply. Find the full load primary and secondary currents,
the secondary emf and the maximum flux in the core. Neglect the leakage drops and the no load
primary current.
17.a) Obtain the relation between line and phase voltages and currents in star connected system
b) A 220V 3 phase voltage is applied to a balanced delta connected 3 phase load of phase
Impedance (15+j20) Ω.
i) Find the phasor current in each line
ii) The power consumed /phase
iii) Draw the phasor diagram
Or
18.a) Why a single phase induction motor is not self starting?
b) Describe the different rotor constructions in an alternator.
19) Describe the various non conventional energy sources.
Or
20.a) Explain the working principle of mercury vapor lamp.
b) Explain the energy management techniques applied to a residential building.
(5 × 12 =60 marks)
Other Question Papers
Engineering Mathematics
Engineering Mechanics
Basic Electronics Engineering
Engineering Physics
Civil Engineering
Engineering Graphics
Basic Mechanical Engineering
0 comments:
Post a Comment