Steel Authority Of India Limited
Electrical Engineering Previous Years Solved Papers
Q.1.Two 100-W, 200-V lamps are connected in series across a 200-V supply. The total power consumed by each lamp will be _____ watts.
Q.2.Kirchhoff’s voltage law is not valid for a non-linear network.
Q.3.The material used for fuse must have
- low melting point and low specific resistance
- high melting point and low specific resistance
- low melting point and high specific resistance
- none of these
Q.4.If a piece of metal wire is stretched, its resistance will increase.
Q.5.The usual value of the surge impedance of a telephone line is ______ohm.
Q.6.In mesh analysis of a network, all the mesh currents must necessarily be either clock-wise or anticlock-wise.
Q.7.The purpose of introducing reactor in the ignition circuit of mercury are rectifier is to limit the
- voltage of the circuit
- rate of change of flux in the circuit
- current in the circuit
- rate of change of current in the circuit
Q.8.An uncharged capacitor is connected across a charged one. There will flow an impulsive current through the circuit.
Q.9.In the case of a lossy capacitor, series equivalent resistance value will be
- small
- large
- very small
- none of these
Q.10.Time constant of an R-C circuit increases if the value of resistance is
- decreased
- increased
- both above
- none of the above
Q.11.If R, L and C denote resistance, inductance and capacitance respectively, the quantity RC has the same dimensions as that of R/L.
12.If R, L and C denote resistance, inductance and capacitance respectively, then the quantity CR2 has the dimensions, of L.
13.Sparking between contacts can be reduced by inserting a
- capacitor in parallel with contacts
- resistance in the line
- capacitor in series with contacts
- none of these
14.A battery will not cause any current to flow, when it is connected across a pure capacitor, in the steady state even if the capacitor value varies with time.
15.Voltage stress is maximum in a cable at the surface of the
- insulator
- sheath
- conductor
- none of these
16.When two capacitors C1 and C2 are connected in series, the effective capacitance is C1+C2
17.Sparking occurs when a load is switched off because the circuit has high
- resistance
- inductance
- capacitance
- none of these
18.The flux linked with a coil of inductance l carrying a current i is ddt(Li).
19.The coefficient of coupling between two air core coils depends on
- mutual inductance and self inductances of the two coils
- mutual inductance between two coils only
- self inductances of the two coils only
- none of these
20. The location of lightning arrestor is
- away from the transformer
- near the transformer
- near the circuit breaker
- none of these
21. A conductor of length 1 meter moves at rt. angles to a magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced e.m.f. in the conductor will be ----- volt.
22.In electrical machines, laminated cores are used with a view to reducing
- eddy current loss
- hysteresis loss
23.A battery
- always delivers power
- always absorbs power
- absorbs power when the internal resistance is non-zero but delivers power when the internal resistance is zero
- can absorb or deliver power depending upon the circuit to which it is connected
24.When one wants to connect two batteries in parallel to draw larger current than what can be supplied by one battery, it suffices to ensure that their e.m.f.s. are equal.
25.An ideal battery can supply infinite current
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