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LMRC JE 2018 EE: Practice Quiz 16
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Question 1
An alternating voltage is given by 
volts. Its average value will be………
volts. Its average value will be………Question 2
A 
3-phase, 
transformer is ∆-connected on the h.v. side and Y-connected on the 1.v. side. The resistance of the h.v. winding is 
per phase and that of 1.v. winding 
per phase. The total full-load losses of the transformer operating at full-load efficiency of 95.8% and p.f. 0.8 (lag) are
3-phase, transformer is ∆-connected on the h.v. side and Y-connected on the 1.v. side. The resistance of the h.v. winding is per phase and that of 1.v. winding per phase. The total full-load losses of the transformer operating at full-load efficiency of 95.8% and p.f. 0.8 (lag) are Question 3
Two spherical conductors 
and 
of radii 
and 
are placed concentrically in air. 
is given a charge 
and 
is earthed. The equivalent capacitance of the system is [See Fig. 6.32]
and of radii and are placed concentrically in air. is given a charge and is earthed. The equivalent capacitance of the system is [See Fig. 6.32] Question 4
A symmetrical fault occurs on a power system. The percentage reactance of the system on 5000 base kVA is 25%. If the full-load current corresponding to base kVA is 20A, then short-circuit current is
Question 5
An autotransformer having voltage transformation ratio 0.8 supplies a load of 
. The power transferred inductively from the primary to the secondary is
. The power transferred inductively from the primary to the secondary is Question 6
Each of the three coils generates an e.m.f. of 230 V. The e.m.f. of second leads that of the first by 
and the third lags behind the first by the same angle. The resultant e.m.f. across the series combination of the coils is
and the third lags behind the first by the same angle. The resultant e.m.f. across the series combination of the coils isQuestion 7
A basic D’ Arsonval movement with internal resistance 
and full-scale current of 1 mA is to be converted into a multi range d.c. voltmeter with ranges 0-10 V, 0-30 V, 0-100 V. The circuit arrangement is shown in Fig.
and full-scale current of 1 mA is to be converted into a multi range d.c. voltmeter with ranges 0-10 V, 0-30 V, 0-100 V. The circuit arrangement is shown in Fig. Question 8
On the occurrence of an unsymmetrical fault, the sequence component which is always greater than the negative sequence component is
Question 9
A length of wire has a resistance of 6 ohms. The resistance of a wire of the same material three times as long and twice the cross-sectional area will be
Question 10
A generating station has an average demand of 15 MW. If the plant capacity factor is 50%, what is the plant capacity?
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ESE & GATE EEGeneralJun 26ESE & GATE EE
