MCQOPTIONS
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MCQOPTIONS
This section includes 1800 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1051. |
In any two port network, input impedance is independent of load impedance. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1052. |
In the circuit of figure, Thevenin's resistance is 10 Ω |
| A. | 25 Ω |
| B. | 10 Ω |
| C. | 13.33 Ω |
| D. | 6 Ω |
| Answer» C. 13.33 Œ© | |
| 1053. |
Assertion (A): In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance.Reason (R): The behaviour of a spring and capacitor are similar. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true and R is not the correct explanation of A | |
| 1054. |
In a series RLC circuit, the value of resistance for critical damping is |
| A. | L/C |
| B. | (L/C)0.5 |
| C. | 1/LC |
| D. | 2/L/C |
| Answer» E. | |
| 1055. |
A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be |
| A. | over damped |
| B. | critically damped |
| C. | under damped |
| D. | any of the above depending the magnitude of voltage |
| Answer» C. under damped | |
| 1056. |
A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its waveform is |
| A. | 8 rectangular |
| B. | 8 triangular |
| C. | 4 triangular |
| D. | 4 rectangular |
| Answer» D. 4 rectangular | |
| 1057. |
Which of following is linear and bilateral parameter? |
| A. | Resistors |
| B. | Semi conductor diodes |
| C. | Electron tubes |
| D. | Transistor |
| Answer» B. Semi conductor diodes | |
| 1058. |
Sometimes the rotating devices in a room having fluorescent lamps appear to be any station. This is due to |
| A. | defect in the lamp |
| B. | low voltage |
| C. | high voltage |
| D. | stroboscopic effect |
| Answer» B. low voltage | |
| 1059. |
The polynomial P (s) = (s - 1) (s2 + 1) (s + 2) (s + 3) is |
| A. | Hurwitz but not strictly Hurwitz |
| B. | not Hurwitz |
| C. | strictly Hurwitz |
| D. | anti/Hurwitz |
| Answer» D. anti/Hurwitz | |
| 1060. |
An RC impedance function has a constant value at s = 0. The last element in the first cauer synthesis |
| A. | will be a capacitor |
| B. | may be R or C |
| C. | will be R |
| D. | will depend on the behaviour of function at s = ‚àû |
| Answer» D. will depend on the behaviour of function at s = ‚àû | |
| 1061. |
In the circuit shown in figure the inductor current and capacitor voltage are given at a time t. At this instant i is __________ A and is __________ A/sec. |
| A. | -5 A, 10 V |
| B. | 5 A, 50 V |
| C. | 2.5, 25 |
| D. | 0, ‚àû |
| Answer» B. 5 A, 50 V | |
| 1062. |
A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is |
| A. | a straight line parallel to Y axis in 4th quadrant |
| B. | a straight line parallel to X axis in 4th quadrant |
| C. | a straight line parallel to Y axis in second quadrant |
| D. | a straight line parallel to Y axis in first quadrant |
| Answer» D. a straight line parallel to Y axis in first quadrant | |
| 1063. |
While using Maxwell bridge, the Q factor of a coil is obtained as |
| A. | 1/ωCR |
| B. | ωCR |
| C. | ωC/R |
| D. | R/ωC |
| Answer» C. œâC/R | |
| 1064. |
The total inductance of two coils is 60 mH in series aiding connection and 40 mH in series opposing connection. The mutual inductance between coils is |
| A. | 20 mH |
| B. | 10 mH |
| C. | 5 mH |
| D. | 2.5 mH |
| Answer» D. 2.5 mH | |
| 1065. |
In figure, which value of ZL will cause maximum power to be transferred to the load? |
| A. | 2 + j2 Ω |
| B. | 2 - j2 Ω |
| C. | - 2 Ω |
| D. | 2 Ω |
| Answer» E. | |
| 1066. |
Consider the following statements for a driving point function F(jω): Re F(jω) is an even function of ω and is 0 or positive for all values of ω.Im F(jω) is an even function of ω and is 0 or positive for all values of ω.Re F(jω) is an odd function of ω and is 0 or negative for all values of ω.Re F(s) = 0 for Re s = 0. Which one of the statements given above is/are correct? |
| A. | 1 only |
| B. | 1 and 4 |
| C. | 2, 2 and 4 |
| D. | 4 only |
| Answer» B. 1 and 4 | |
| 1067. |
The current density J at a point and current I are related as |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1068. |
j6 = |
| A. | j |
| B. | j2 |
| C. | j3 |
| D. | #NAME? |
| Answer» C. j3 | |
| 1069. |
In given figure the switch was closed for a long time before opening at t = 0. The voltage Vx at t = 0+ is |
| A. | 25 V |
| B. | 50 V |
| C. | -50 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 1070. |
The time constant of the capacitance circuit is defined as the time during which voltage |
| A. | falls to 36.8% of its final steady value |
| B. | rises to 38.6% of its final steady value |
| C. | rises to 63.2% of its final steady value. |
| D. | none of the above. |
| Answer» D. none of the above. | |
| 1071. |
In a series RLC circuit for lower frequency power factor is __________ . |
| A. | leading, Lagging |
| B. | lagging, Leading |
| C. | independent of frequency |
| D. | same |
| Answer» B. lagging, Leading | |
| 1072. |
A 60 W, 23 V bulb is used for 45 minutes. The electrical energy consumed in commercial units is |
| A. | 2700 units |
| B. | 0.45 units |
| C. | 4.5 units |
| D. | 0.045 units |
| Answer» E. | |
| 1073. |
Current through a charging capacitor exhibits |
| A. | an exponential growth function |
| B. | an exponential decay function |
| C. | a step decay function |
| D. | a linear decay function |
| Answer» D. a linear decay function | |
| 1074. |
An RLC series circuit is excited by an ac voltage v = 1 sint. If L = 10 H, C = 0.1 F peak value of voltage across R is |
| A. | 0.707 V |
| B. | 1 V |
| C. | 1.44 V |
| D. | indeterminate as value of R is not given |
| Answer» C. 1.44 V | |
| 1075. |
In the circuit, Vs = 10 cos ωt, power drawn by the 4Ω resistor is 8 watt. The power factor is |
| A. | 1 |
| B. | 0.5 |
| C. | 0.85 |
| D. | 0 |
| Answer» D. 0 | |
| 1076. |
A current increasing at the rate of 1 A/s is passed through 1 F capacitor. At t = 0, i = 0. The charge stored after 1 second is |
| A. | 0.5 C |
| B. | 1 C |
| C. | 2 C |
| D. | 4 C |
| Answer» D. 4 C | |
| 1077. |
The maximum power that can be transferred to the load is resistor RL from the voltage source in the figure is |
| A. | 1 W |
| B. | 10 W |
| C. | 0.25 W |
| D. | 0.5 W |
| Answer» D. 0.5 W | |
| 1078. |
The poles and zeros of a positive real functions are real or occur in conjugate pair. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1079. |
In figure, E = 1 V (rms value). The average power is 250 mW. Then phase angle between E and I is |
| A. | 90° |
| B. | 60° |
| C. | 45° |
| D. | 30° |
| Answer» C. 45¬∞ | |
| 1080. |
In an ac network, Thevenin's impedance and Norton's impedance are |
| A. | always the same |
| B. | generally the same |
| C. | sometimes the same |
| D. | always different |
| Answer» B. generally the same | |
| 1081. |
Assertion (A): Q factor of a series resonant circuit is Reason (R): High Q means better selectivity. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 1082. |
Load ZL for maximum power transfer is |
| A. | R |
| B. | R + jωL |
| C. | R - jωL |
| D. | none |
| Answer» D. none | |
| 1083. |
Consider the following from the point of view of possible realization as driving point impedances using passive elements Among these |
| A. | 1, 2, 4 are realisable |
| B. | 1, 2, 3 are realisable |
| C. | 3, 4 are realisable |
| D. | none is realisable |
| Answer» C. 3, 4 are realisable | |
| 1084. |
A constant k high pass filter has fc = 3000 Hz. At f = 1000 Hz, the phase shift is |
| A. | zero |
| B. | p |
| C. | 0.58333333333333 |
| D. | more than p |
| Answer» C. 0.58333333333333 | |
| 1085. |
A system function , the system is at rest for t < 0. For i(t) = u(t), then v(t) is given by |
| A. | 1 - e-4t |
| B. | e-4t |
| C. | e4t |
| D. | 1 + e-4t |
| Answer» C. e4t | |
| 1086. |
Assertion (A): If Z1(s) and Z2(s) are positive real then Z1(s) + Z2(s) as well as 1/Z1(s) and 1/Z2(s) are positive real.Reason (R): The poles of a positive real function are real or occur in conjugate pairs. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 1087. |
The realization of a term in the impedance function will give |
| A. | an inductance of value K0 in series |
| B. | an inductance of value 1/K0 in series |
| C. | even to odd or odd to even polynomials |
| D. | even to even polynomials |
| Answer» E. | |
| 1088. |
A coil of resistance R and inductance L has a capacitor C in parallel with it. The source frequency is adjusted to a value equal to resonant frequency. Another capacitor C is added in parallel with the above circuit, the source current will |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | may increase or decrease |
| Answer» C. remain the same | |
| 1089. |
Which one of the following parameters does not exist for the two port network shown in the given figure? |
| A. | ABCD |
| B. | y |
| C. | h |
| D. | z |
| Answer» E. | |
| 1090. |
Which statement is incorrect for parallel resonance? |
| A. | P.f. is 1 |
| B. | Y is minimum |
| C. | B is zero |
| D. | Z is minimum |
| Answer» E. | |
| 1091. |
A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» D. 1 | |
| 1092. |
For an ideal transformer |
| A. | only Y parameter exist |
| B. | only Z parameter |
| C. | Z, Y both exist |
| D. | neither Z parameter nor Y parameter exist |
| Answer» C. Z, Y both exist | |
| 1093. |
In the circuit shown the voltage Vs has a phase angle of __________ with respect to VL. |
| A. | 120° |
| B. | 60 ° |
| C. | -90 ° |
| D. | 0° |
| Answer» C. -90 ¬∞ | |
| 1094. |
If V = 20 + j20, then loge(A) A is |
| A. | 3.342 + j 45 |
| B. | 28.28 ∠45° |
| C. | 400 ∠45° |
| D. | 3.342 + j 0.785 |
| Answer» E. | |
| 1095. |
Consider the following statements regarding driving point admittance function It is an admittance of R1 networkPoles and zeros alternate on the negative real axis of planeThe lowest critical frequency is a poleY(0) = 1/3 Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 2 and 4 |
| C. | 1 and 3 |
| D. | 1, 2, 3 and 4 |
| Answer» C. 1 and 3 | |
| 1096. |
If a two port network is represented by an equivalent T network, the impedance of shunt arm in terms of ABCD parameters is equal to |
| A. | 1/C |
| B. | (A - 1)/C |
| C. | 1/B |
| D. | (D - 1)/C |
| Answer» B. (A - 1)/C | |
| 1097. |
In the circuit shown in the figure the power dissipated in 30 Ω resistor will be maximum if the value of R is |
| A. | 30 Ω |
| B. | 10 Ω |
| C. | 9 Ω |
| D. | zero |
| Answer» E. | |
| 1098. |
Assertion (A): is not an LC function.Reason (R): The highest powers of numerator and denominator do not differ by 1. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 1099. |
When a function Z(s) having a pole at infinity is realized, we get |
| A. | a capacitance in series |
| B. | a resistance in series |
| C. | an inductance in series |
| D. | a resistance or inductance in series |
| Answer» D. a resistance or inductance in series | |
| 1100. |
In ZRC(s) has a pole at s = 0, the first element in first Foster realization is |
| A. | a capacitor |
| B. | a resistor |
| C. | R-C in series |
| D. | either a capacitor or resistor |
| Answer» B. a resistor | |