১.
terminal voltage Rab=?
ব্যাখ্যা
Y - ∇ transformation
৪৯তম বিসিএস ⎯ তথ্য ও যোগাযোগ প্রযুক্তি (EEE) [ ৮৯২]
মোট প্রশ্ন৩০
সিলেবাস
Exam 1
Electrical Circuits:
i) The Basic Electrical Circuit Elements: Response of Basic R, L, and C, Average Power and Power Factor, Phasor
ii) Methods of Circuit Analysis (DC & AC): Ohm’s Law, Nodes, Kirchhoff’s Laws, Independent versus Dependent Sources, Source Conversions, Mesh Analysis, The Supermesh, Nodal Analysis, Delta-Wye Conversion
[Source: Class–1 and relevant books]
৪৯তম বিসিএস ⎯ তথ্য ও যোগাযোগ প্রযুক্তি (EEE) [ ৮৯২]
৪৯তম বিসিএস ⎯ তথ্য ও যোগাযোগ প্রযুক্তি (EEE) [ ৮৯২] · তারিখ অনির্ধারিত · ৩০ প্রশ্ন
২.
Charge is-
ব্যাখ্যা
Charge can be expressed in terms of positive and negative.
৩.
If energy w = 100t2+ 99 t + 2 then calculate power at 0.1 sec
ব্যাখ্যা
p=dw/dt
৪.
The voltage 20,000,000 V can be expressed in powers of 10
ব্যাখ্যা
20,000,000 V
= 2×107V
= 20×106
= 20 MV
= 2×107V
= 20×106
= 20 MV
৫.
In a DC network, a resistor and capacitor are in series. what will be the potential drop across the resistor?
ব্যাখ্যা
In dc circuit, capacitor act as open circuit. so, no current will flow. hence, the potential drop across the resistor is zero
৬.
If a charged capacitor is connected across a resistor in a DC circuit without a supply, what is the nature of the current flow?
ব্যাখ্যা
nature of capacitor
৭.
Which parameter best defines the charging time of a capacitor in a DC RC circuit?
ব্যাখ্যা
In a DC circuit, the time constant of a capacitor represents the rate at which capacitor charges or discharges
৮.
Why can inductors produce high voltages in a DC circuit when switched off suddenly?
ব্যাখ্যা
the collapsing magnetic field induces a high voltage across the inductor's terminals. inductors resist changes in current. When the current is abruptly interrupted, the inductor tries to maintain the current flow, generating a large voltage spike
৯.
Why is energy loss associated with a resistor but not with ideal capacitors and inductors in DC circuits?
ব্যাখ্যা
Ideal capacitors and inductors are energy storage elements.
১০.
which of the following is true for KCL ?
ব্যাখ্যা
Since the node is not a circuit element, any charge which enters node must leave immediately.
১১.
i = ?
ব্যাখ্যা
Vt = 10 + 5 -20 = -5u
Rt = 5 + 2 + 3 = 10Ω
I = V/R = -5/10 = -0.5A.
Rt = 5 + 2 + 3 = 10Ω
I = V/R = -5/10 = -0.5A.
১২.
The dependent source is:
ব্যাখ্যা
a. current-controlled current source
b. voltage-controlled current source
c. voltage-controlled voltage source
d. current-controlled voltage source
১৩.
N
IN=?
IN=?
ব্যাখ্যা
IN= (20/10) + (10/5).
১৪.
Norton’s equivalent circuit consists of a -
ব্যাখ্যা
Norton’s equivalent circuit consists of a Current source in parallel with a resistor.
১৫.
Thevenin’s resistance RTh =
ব্যাখ্যা
Thevenin’s resistance is defined as the ratio of open circuit voltage to the short circuit current across the terminals of the original circuit.
১৬.
v0=?
ব্যাখ্যা
-12+4i+2vo-4+6i=0
vo=-6i
solving two equation , vo=48V
vo=-6i
solving two equation , vo=48V
১৭.
i0=?
ব্যাখ্যা
use node analysis
১৮.
Rab=?
ব্যাখ্যা
use series and parallel rules for resistor
১৯.
Maximum power in terms of the thevenin’s voltage and load resistance-
ব্যাখ্যা
Pmax= v*i= i*R*i= i2RL = (VTh/(RTh+RL))2*RL. Max power occurs when RL=RTh.
২০.
the maximum power delivered across RL of the circuit is-
ব্যাখ্যা
Pmax= (VTh/(RTh+RL))2*RL (RTh=RL)
VTh= (150/150+30)*540= 450V
RTh=(150*30)/180= 25Ω
VTh= (150/150+30)*540= 450V
RTh=(150*30)/180= 25Ω
২১.
If there are 5 sources in a network out of which 3 are dependent and 2 are independent. For superposition principle how many sources are considered?
ব্যাখ্যা
Only independent sources are considered while using Superposition principle. Dependent sources are never deactivated while using this principle.
২২.
In the circuit, decrease in R3 leads to a decrease of
অনির্ধারিতIn the circuit, decrease in R3 leads to a decrease of
ব্যাখ্যা
সঠিক উত্তর খ) voltage across R3 ও গ) voltage across R2
অপশনে একাধিক সঠিক উত্তর থাকায় প্রশ্নটি বাতিল করা হয়েছে।
অপশনে একাধিক সঠিক উত্তর থাকায় প্রশ্নটি বাতিল করা হয়েছে।
২৩.
A network has 12 branches and 8 independent
loops. How many nodes are there in the
network?
loops. How many nodes are there in the
network?
ব্যাখ্যা
b=l+n-1
২৪.
Rc=?
Rc=?
ব্যাখ্যা
Y-∇ transformation
২৫.
The imaginary part of impedance is called:
ব্যাখ্যা
Z = R + jX
Z=impedance
R=resistance (real part)
X=reactance (imaginary part)
Z=impedance
R=resistance (real part)
X=reactance (imaginary part)
২৬.
v(t)=10sin (4πt- 500)
what is the time period of the sinusoid ?
what is the time period of the sinusoid ?
ব্যাখ্যা
ω=2π/T
here, ω=4π
here, ω=4π
২৭.
v1 =-10cos (4πt+500), v2 =12sin (4πt-100)
which of the following is correct?
which of the following is correct?
ব্যাখ্যা
convert the equation into only sine or cosine form. then compare phase angle
২৮.
V =-10∠300 Volt
what will be time domain representation?
what will be time domain representation?
ব্যাখ্যা
V =-10∠300=10∠(30+180)=10∠2100
v(t)=10 cos(ωt+210)
alternative
V =-10∠300=10∠(30-180)=10∠-1500
v(t)=10 cos(ωt-150)
v(t)=10 cos(ωt+210)
alternative
V =-10∠300=10∠(30-180)=10∠-1500
v(t)=10 cos(ωt-150)
২৯.
For multiplication and division of phasors, what form of phasor is used?
ব্যাখ্যা
for addition and subtruction - rectangular form
For multiplication and division- polar form
For multiplication and division- polar form
৩০.
The time axis of an AC phasor represent ?
ব্যাখ্যা
the time axis of a phasor represents the phase angle of alternating quantity such as voltage,current