MCQOPTIONS
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MCQOPTIONS
This section includes 213 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Find the total voltage applied in a series RLC circuit when i=3mA, Vₗ=30V, Vc=18V and R=1000 ohms. |
| A. | 3.95V |
| B. | 51V |
| C. | 32.67V |
| D. | 6.67V |
| Answer» C. 32.67V | |
| 52. |
In ac circuit, resistance 5 ohm is connected with a capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the voltage across a capacitor. |
| A. | 300 V |
| B. | 200 V |
| C. | 240 V |
| D. | 100 V |
| Answer» D. 100 V | |
| 53. |
In which device inductor cannot be used? |
| A. | filter circuit |
| B. | transformer |
| C. | choke |
| D. | dielectric |
| Answer» E. | |
| 54. |
Choke involve use of _____________ |
| A. | Resistor |
| B. | Capacitor |
| C. | Inductor |
| D. | Transistor |
| Answer» D. Transistor | |
| 55. |
Inductor does not allow sudden changes in? |
| A. | Voltage |
| B. | Current |
| C. | Resistance |
| D. | Inductance |
| Answer» C. Resistance | |
| 56. |
What is the value of impedance at resonance? |
| A. | Xₗ |
| B. | Xc |
| C. | R |
| D. | 0 |
| Answer» D. 0 | |
| 57. |
Which, among the following, is the correct expression for φ. |
| A. | φ=tan¯¹ (XL/R) |
| B. | φ=tan¯¹ (R/XL) |
| C. | φ=tan¯¹ (XL*R) |
| D. | φ=cos¯¹ (XL/R) |
| Answer» B. φ=tan¯¹ (R/XL) | |
| 58. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a x V 50Hz sinusoidal supply. The current in the circuit is 8.2A. Calculate the value of x. |
| A. | 10V |
| B. | 50V |
| C. | 100V |
| D. | 120V |
| Answer» D. 120V | |
| 59. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the voltage across the inductor. |
| A. | 52V |
| B. | 82V |
| C. | 65V |
| D. | 76V |
| Answer» C. 65V | |
| 60. |
What is the real part of the impedance of RLC circuit? |
| A. | Resistance |
| B. | Conductance |
| C. | Admittance |
| D. | Reactance |
| Answer» B. Conductance | |
| 61. |
The combination of resistance and reactance known as ___________ |
| A. | Susceptance |
| B. | Impedance |
| C. | Conductance |
| D. | Admittance |
| Answer» C. Conductance | |
| 62. |
In ac circuit, resistance 5 ohm is connected with capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the voltage across resistance. |
| A. | 300 V |
| B. | 200 V |
| C. | 240 V |
| D. | 100 V |
| Answer» E. | |
| 63. |
Can capacitor fully charge using alternating current? |
| A. | yes |
| B. | no |
| C. | may or may not |
| D. | depend on value of capacitance |
| Answer» B. no | |
| 64. |
What is the resonance condition? |
| A. | When Xₗ>Xc |
| B. | When Xₗ<Xc |
| C. | When Xₗ=Xc |
| D. | When Xc=infinity |
| Answer» D. When Xc=infinity | |
| 65. |
In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the inductive reactance in the circuit. |
| A. | 36 ohm |
| B. | 95 ohm |
| C. | 125 ohm |
| D. | 140 ohm |
| Answer» C. 125 ohm | |
| 66. |
What is φ in terms of voltage? |
| A. | φ=cos¯¹V/VR |
| B. | φ=cos¯¹V*VR |
| C. | φ=cos¯¹VR/V |
| D. | φ=tan¯¹V/VR |
| Answer» D. φ=tan¯¹V/VR | |
| 67. |
What is the current in an inductive circuit when the applied voltage is maximum? |
| A. | Infinity |
| B. | Maximum |
| C. | Zero |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 68. |
If in an alternating current circuit, capacitance of 30 µF is connected to a supply of 200V,50Hz. Find the current in the circuit. |
| A. | 1.38 A |
| B. | 1.89 A |
| C. | 1.74 A |
| D. | 0.89 A |
| Answer» B. 1.89 A | |
| 69. |
What is the value of current in an inductive circuit when there is no applied voltage? |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Cannot be determined |
| Answer» C. Zero | |
| 70. |
Inductance is _____________________ to number of turns in the coil. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | equal |
| D. | not related |
| Answer» B. inversely proportional | |
| 71. |
In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the phase difference between current and voltage. |
| A. | 670 |
| B. | 540 |
| C. | 470 |
| D. | 770 |
| Answer» B. 540 | |
| 72. |
What is the resistance offered by a capacitor? |
| A. | Susceptance |
| B. | Conductance |
| C. | Admittance |
| D. | Reactance |
| Answer» E. | |
| 73. |
In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the impedance in the circuit. |
| A. | 110 ohm |
| B. | 100 ohm |
| C. | 125 ohm |
| D. | 140 ohm |
| Answer» D. 140 ohm | |
| 74. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the phase difference. |
| A. | -55.1 |
| B. | 55.1 |
| C. | 66.1 |
| D. | -66.1 |
| Answer» B. 55.1 | |
| 75. |
What is not a frequency for ac current? |
| A. | 50 Hz |
| B. | 55 Hz |
| C. | 0Hz |
| D. | 60 Hz |
| Answer» D. 60 Hz | |
| 76. |
In an RLC series phasor, we start drawing the phasor from which quantity? |
| A. | Voltage |
| B. | Resistance |
| C. | Impedance |
| D. | Current |
| Answer» E. | |
| 77. |
When is tanφ positive? |
| A. | When inductive reactance is less than capacitive reactance |
| B. | When inductive reactance is greater than capacitive reactance |
| C. | When inductive reactance is equal to capacitive reactance |
| D. | When inductive reactance is zero |
| Answer» C. When inductive reactance is equal to capacitive reactance | |
| 78. |
Which type of current can be stored in a capacitor? |
| A. | Alternating current |
| B. | Direct current |
| C. | Both alternating current and direct current |
| D. | Neither alternating current nor direct current |
| Answer» C. Both alternating current and direct current | |
| 79. |
In an RLC circuit, which of the following is always used as a vector reference? |
| A. | Voltage |
| B. | Resistance |
| C. | Impedance |
| D. | Current |
| Answer» B. Resistance | |
| 80. |
In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the current in the circuit. |
| A. | 0.01 A |
| B. | 0.2 A |
| C. | 0.02 A |
| D. | 0.002 A |
| Answer» C. 0.02 A | |
| 81. |
For an RL circuit, the phase angle is always ________ |
| A. | Positive |
| B. | Negative |
| C. | 0 |
| D. | 90 |
| Answer» C. 0 | |
| 82. |
If in an alternating current circuit, capacitance C is connected to a supply of 200V,50Hz. Current in the circuit is 1.89 A. Find the capacitance C. |
| A. | 30 µF |
| B. | 20 µF |
| C. | 10 µF |
| D. | 15 µF |
| Answer» B. 20 µF | |
| 83. |
What is the frequency in resonance condition? |
| A. | Minimum |
| B. | Maximum |
| C. | Cannot be determined |
| D. | Zero |
| Answer» C. Cannot be determined | |
| 84. |
What is tanϕ for RC circuit? |
| A. | Xc/R |
| B. | Xₗ/R |
| C. | R/Z |
| D. | Z/R |
| Answer» B. Xₗ/R | |
| 85. |
If in an alternating current circuit, impedance is 26 ohm, capacitive reactance is 24 ohm, what is the resistance? |
| A. | 25 ohm |
| B. | 10 ohm |
| C. | 12 ohm |
| D. | 23 ohm |
| Answer» C. 12 ohm | |
| 86. |
If in an alternating current circuit, resistance is 5 ohm, capacitive reactance is 12 ohm, what is the impedance? |
| A. | 5 ohm |
| B. | 10 ohm |
| C. | 12 ohm |
| D. | 13 ohm |
| Answer» E. | |
| 87. |
The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in an inductive circuit is? |
| A. | i = Vm(sint)/Xₗ |
| B. | i = Vm(cost)/Xₗ |
| C. | i = -Vm(sint)/Xₗ |
| D. | i = -Vm(cost)/Xₗ |
| Answer» E. | |
| 88. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the voltage across the resistor. |
| A. | 31.8V |
| B. | 57.4V |
| C. | 67.3V |
| D. | 78.2V |
| Answer» C. 67.3V | |
| 89. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the current in the circuit. |
| A. | 2.2A |
| B. | 4.2A |
| C. | 6.2A |
| D. | 8.2A |
| Answer» E. | |
| 90. |
What value of direct current must flow through a resistor to produce the same heating power as an alternating current with a peak value of 3.5 A? |
| A. | 1.5 A |
| B. | 2.5 A |
| C. | 3.5 A |
| D. | 4.5 A |
| Answer» C. 3.5 A | |
| 91. |
What is imaginary part of the impedance of RLC circuit? |
| A. | Resistance |
| B. | Conductance |
| C. | Admittance |
| D. | Reactance |
| Answer» E. | |
| 92. |
In an inductive circuit, the current________ the voltage? |
| A. | Leads |
| B. | Lags |
| C. | Is greater than |
| D. | Is less than |
| Answer» C. Is greater than | |
| 93. |
What is impedance at resonance? |
| A. | maximum |
| B. | minimum |
| C. | zero |
| D. | cannot be determined |
| Answer» C. zero | |
| 94. |
What is sinϕ from impedance triangle? |
| A. | Xₗ/R |
| B. | Xₗ/Z |
| C. | R/Z |
| D. | Z/R |
| Answer» C. R/Z | |
| 95. |
The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in a resistive circuit is? |
| A. | 1A |
| B. | 2A |
| C. | 3A |
| D. | 4A |
| Answer» C. 3A | |
| 96. |
What is the resonance frequency of ac circuit? |
| A. | 1/√LC |
| B. | √(L/C) |
| C. | √LC |
| D. | LC |
| Answer» B. √(L/C) | |
| 97. |
What is the relation between reactance, resistance and impedance? |
| A. | Z=R+jX |
| B. | Z=R+X |
| C. | Z=R-X |
| D. | Z=R-jX |
| Answer» B. Z=R+X | |
| 98. |
In an inductive circuit, the voltage_______ the current? |
| A. | Leads |
| B. | Lags |
| C. | Is greater than |
| D. | Is less than |
| Answer» B. Lags | |
| 99. |
What is the correct expression for the phase angle in an RLC series circuit? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 100. |
Which type of ac waveform is given in figure? |
| A. | sinusoidal |
| B. | triangular |
| C. | square |
| D. | complex waveform |
| Answer» B. triangular | |