1030233210 - ELECTRICAL CIRCUIT THEORY - STUDY MATERIALS

 

 

1030233210 - ELECTRICAL CIRCUIT THEORY -  STUDY MATERIALS

MODEL QUESTION PAPER - MCQ 

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PART – A ( ONE MARKS )

1.      The SI unit of resistance is
 a) Ohm
b) Farad
c) Henry
d) Watt

2.      Ohm’s law states that
 a) V ∝ I
b) V = I/R
c) I = R/V
d) I = VR

3.      The power dissipated in a resistor is
a) R2I
b) IR
 c) I²R
d) V²R

4.      The total resistance of three resistors connected in series is
a) R₁R₂R₃
 b) R₁ + R₂ + R₃
c) 1/R₁ + 1/R₂ + 1/R₃
d) (R₁R₂)/(R₁ + R₂)

5.      Thevenin’s theorem is applicable only to
 a) Linear networks
b) Nonlinear networks
c) AC networks only
d) DC networks only

6.      Norton’s equivalent circuit consists of
a) Voltage source in parallel with Thevenin’s resistance
 b) Current source in parallel with Thevenin’s resistance
c) Voltage source in series with Thevenin’s resistance
d) Inductor in series with resistor

7.      In superposition theorem, all other sources are replaced by
a) Open circuit for voltage, short circuit for current
 b) Short circuit for voltage, open circuit for current
c) Both shorted
d) Both opened

8.      Maximum power transfer occurs when load resistance equals
 a) Source resistance
b) Half of source resistance
c) Twice source resistance
d) Zero

9.      The average value of a pure sine wave is
a) 0.707 × Vmax
 b) 0.637 × Vmax
c) 1.11 × Vmax
d) Vmax

10.  The RMS value of a sine wave is
 a) 0.707 × Vmax
b) 0.5 × Vmax
c) 1.11 × Vmax
d) 0.637 × Vmax

11.  In a pure inductive circuit, current
 a) Lags voltage by 90°
b) Leads voltage by 90°
c) Is in phase
d) Is opposite in phase

12.  Power factor of a purely resistive circuit is
a) 0
b) 0.5
 c) 1
d) 0.707

13.  Resonance occurs when
 a) XL = XC
b) XL > XC
c) XC > XL
d) R = XL

14.  The unit of conductance is:
a) Ohm
 b) mho
c) Henry
d) Farad

15.  The Q-factor of a coil is the ratio of
a) Resistance to reactance
 b) Reactance to resistance
c) Voltage to current
d) Power to frequency

16.  In a two branch parallel circuit, the total admittance is equal to the:
a) difference of branch admittances
b) reciprocal of branch admittances
 c) sum of branch admittances
d) ratio of branch admittances

17.  In a delta-connected system:
a) the line voltage is equal to the phase voltage
b) the phase voltage is equal to the line voltage
 c) the line voltage is √3 times the phase voltage
d) the phase voltage is √3 times the line voltage

18.  The phase sequence in a three-phase system determines:
a) The magnitude of the phase voltages
 b) The direction of rotation of motors
c) The line current
d) The efficiency of power transmission

19.  In a balanced three-phase load, when the power factor is unity, the two-wattmeter method will result in:
 a) Both wattmeters showing the same value
b) One wattmeter showing zero and the other showing the total power
c) Both wattmeters showing zero
d) Both wattmeters showing different values

20.  Symmetrical components are primarily used to:
 a) Simplify the analysis of unbalanced systems
b) Measure the total power in a system
c) Analyze balanced systems
d) Measure the impedance of the system