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631.

To conduct load test on a dc shunt motor, it is coupled to a generator which is identical to the motor. The field of the generator is also connected to the same supply source as the motor. The armature of the generator is connected to a load resistance. The armature resistance id 0.02 p.u. armature reaction and mechanical losses can be neglected. With rated voltage across the motor, the load resistance across the generator is adjusted to obtain rated armature current in both motor and generator. The p.u. value of this load resistance is [2 marks]
(a) 1.0
(b) 0.98
(c) 0.96
(d) 0.94

asked in Electrical Engineering, 2003

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632.

Fig.shows an ideal single-phase transformer. The primary and secondary coils are wound on the core as shown. Turns ratio (N₁/N₂) = 2. The correct phasors of voltages E₁, E₂ currents I₁, I₂ and core flux φ are as shown in

[2 marks]

asked in Electrical Engineering, 2003

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633.

A composite parallel plate capacitor is made up of two different dielectric materials with different thickness (t₁ and t₂) as shown in Fig. The two different dielectric materials are separated by a conducting foil F. The voltage of the conducting foil is

[2 marks]
(a) 52 V
(b) 60 V
(c) 67 V
(d) 33 V

last reply by CpjJwWHV • 8 years ago • asked in Electrical Engineering, 2003

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634.

A parallel plate capacitor has an electrode area of 100 mm², with a spacing of 0.1mm between the electrodes. The dielectric between the plates is air with a permittivity of 8.85×10^-12 F/m. The charge on the capacitor is 100 V. the stored energy in the capacitor is [2 marks]
(a) 8.85 pJ
(b) 440 pJ
(c) 22.1 nJ
(d) 44.3 nJ

asked in Electrical Engineering, 2003

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635.

A point charge of +1 nC is placed in a space with a permitivity of 8.85 × 10^-12 F/m as shown in Fig. The potential difference V_PQ between two points P and Q at distances of 40 mm and 20 mm respectively from the point charge is

[2 marks]
(a) 0.22 kV
(b) -225 V
(c) -2.24 kV
(d) 15 V

asked in Electrical Engineering, 2003

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636.

The h-parameters for a two-port network are defined by . For the two-port network shown in Fig, the value of h₁₂ is given by

[2 marks]
(a) 0.125
(b) 0.167
(c) 0.625
(d) 0.25

asked in Electrical Engineering, 2003

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