Bangladesh Rural Electrification Board
(REB)
Post : Assistant Engineer (Electrical)
Full Marks : 80 Time: 1 Hr
Set-Ka
Year: 2014
1. Reciprocity theorem is applicable for
a.
Unilateral
network b) bilateral network
b. ideal network d)
None of these
2 . A JFET is also called
a.
Unipolar transistor b)
Bipolar transistor
b. Unijunction transistor d) none of the above
3.Form factor of sinusoidal alternating
current is
a)1.11% b)1.11A c)1.11 d) b and c
4. Relation between resonant power P0 and
off- resonant power P is:
a) P0=P b) P0>P
c)
P0<P d) none
5. In a parallel resonance ac circuit
following points to be
remembered
a)
The admittance
equals conductance
b)
both a
and c
c)
The power factor of the circuit is unity
d) None of the above
6. A network which attenuates a single
band
frequencies
and
allows those on either Side to Pass through is
called:
a)
Low-pass
filter b) High-pass filter
c) Bandstop filter d) Bandpass filter
7. The frequency corresponding to
half-power point on the reponse
curve of a filter is known as -
a) Cutoff
b)
Upper
c) Lower d)
Roll-off
8. If D is the electric flux density,hen
the value if electric intensity of a
medium is -
a) D / €0 b) D / €0€ c) €0€ / D d) €0D
9. The
stabilization of operating point in Potential divider methods is provided by
a)
RE consideration b) RC consideration
b) Vcc consideration. d) None of the these
10. The stabilization of operating point
in Potential divider methods is provided by
a) CMMR of the op amp b) Gain-bandwidth product
c) supply voltage d) Tolerance of the resistors
11. Emitter follower is used for:
b)
a)
Current gain b) Impedance
matching
c) Voltage gain d)
None of these
12. An oscillator differs from an amplifier
because it :
a) Has more gain
b) Requires
no input signal
c) Requires no dc supply d) Always
has the same input
13. The dimensions of L/CR are that of
a) Farad b) Henry
c)
Ohm d) None
14. In the breakdown region, a zener diode
behaves like a
a) Constant current source b) Constant resistance
c) Forward biased d) Constant voltage source
15. The maximum efficiency of a half-wave diode
rectifier is :
a) 50% b) 25% c) 40.6% d) 81.2%
16. The collector of a transistor is :
a) Heavily doped b)
Moderately doped
c) Lightly doped d) None of these
17. Transsistor biasing is done to keep:
a) Proper ac current in the circuit
b) The base current small in the circuit
c) Proper dc current in the circuit
d) Collector current small in the circuit
18. According to Faraday’s Laws of Electromagnetic Induct,an
emf is
induced in a conductor whenever it
a)
Lies in a magnetic field
b)
Cuts magnetic flux
c)
Move parallel to the direction of
the magnetic field
d)
Lies perpendicular to the magnetic
flux
19. The phase difference between the output and input
voltage of a CE amplifier is:
a)
Class A operation b) Class
C operation
c)
Class B operation d) Class
AB operation
20. If a three-stage amplifier has individual stage gains of
10 dB and 15 dB,then the total gain is:
a)
a) 750 dB b) 30
dB c) 24 dB d) 7.5 dB
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