HPCL/BPCL/IOCL Engineering Assistant Model Paper – Electrical & Electronics Engineering
1. The unit of magnetic flux density is
(a) gauss
(b) tesla
(c) bohr
(d) weber/sec
Ans- (b)
2. The equation of continuity defines the relation between
(a) electric field and magnetic field
(b) electric field and charge density
(c) flux density and charge density
(d) current density and charge density
Ans- (d)
3. The current in a coil changes from 5A to 1A in 0.4 second. The induced voltage is 40 V. The self inductance in henry is
(a) 1
(b) 2
(c) 4
(d) 10
Ans- (c)
4. The maximum power will be transferred from a voltage source to a load when
(a) the source impedance is half that of the load impedance
(b) the source impedance is equal to that of the load impedance
(c) the source impedance is twice that of the load impedance
(d) both source and load impedances must be zero
Ans- (b)
5. The total number of branches in a network is equal to b. The graph of the network has n number of branches. The minimum number of line currents is
(a) b+n
(b) b
(c) b-n
(d) n
Ans- (c)
6. In a travelling electromagnetic wave, E and H vector fields are
(a) perpendicular in space .
(b) parallel in space.
(c) E is in the direction of wave travel.
(d) H is in the direction of wave travel.
Ans- C
7. A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases four times, the skin depth, will
(a) increase by a factor of 2.
(b) decrease by a factor of 4.
(c) remain the same.
(d) decrease by a factor of 2.
Ans- (d)
8. A hollow rectangular waveguide acts as a
(a) High pass filter
(b) Low pass filter
(c) Band pass filter
(d) Low frequency radiator
Ans- (a)
9. Divergence theorem is applicable for
(a) static field only
(b) time varying fields only
(c) both static and time varying fields
(d) electric fields only
Ans- (c)
10. For a rectangular wave guide, 2.5cm x 1.2cm, dominant cut off wavelength is
(a) 5 cm
(b) 2.5 cm
(c) 2.4 cm
(d) 3.7 cm
Ans- (a)
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