MCQOPTIONS
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MCQOPTIONS
This section includes 159 Mcqs, each offering curated multiple-choice questions to sharpen your BITSAT knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Identify the device in the following symbol. |
| A. | Zener diode |
| B. | Varactor diode |
| C. | Tunnel diode |
| D. | Photo diode |
| Answer» C. Tunnel diode | |
| 102. |
An ideal rectifier should have transformer utilization factor (TUF) of 1. If the actual TUF is 3.5, it shows that |
| A. | Diode is under-loaded |
| B. | The transformer must be 3.5 times larger |
| C. | The transformer should be only 1/3.5 times the ideal size |
| D. | The ripple factor is low |
| Answer» C. The transformer should be only 1/3.5 times the ideal size | |
| 103. |
For the circuit shown in the figure below, assume that D1, D2 and D3 are ideal. v(t) = π sin (100πt) VThe DC components of voltages v1 and v2, respectively are |
| A. | 0 V and 1 V |
| B. | -0.5 V and 0.5 V |
| C. | 1 V and 0.5 V |
| D. | 1 V and 1 V |
| Answer» C. 1 V and 0.5 V | |
| 104. |
Each diode of a 3-phase, half-wave diode rectifier conducts for |
| A. | 60° |
| B. | 90° |
| C. | 120° |
| D. | 180° |
| Answer» D. 180° | |
| 105. |
Output response of diode clipper circuit shown in the figure will be |
| A. | Both (a) & (b) |
| B. | None of the above |
| Answer» B. None of the above | |
| 106. |
In the circuit D1 & D2 are ideal diodes. The current I1 and I2 are |
| A. | 0, 2 mA |
| B. | 2 mA, 0 |
| C. | 8 mA, 0 |
| D. | 0, 8 mA |
| Answer» E. | |
| 107. |
Assume that the diode D1 is ideal and D2 has cut-in voltage of 0.3 V as given in the circuit below. Find out the values of labeled voltage and current. |
| A. | 8 V, 0.5 mA |
| B. | 7.57 V, 0.5 mA |
| C. | 8 V, 0.24 mA |
| D. | 7.57 V, 0.24 mA |
| Answer» E. | |
| 108. |
In the Figure (a) and (b) shown below, the transformers are identical are ideal, except that the transformer in Figure (b) is centre-tapped. Assuming ideal diodes, the ratio of the root-mean-square (RMS) voltage across the resistor R in Figure (a) to that in Figure (b) is |
| A. | \(\sqrt 2 :1\) |
| B. | 2 : 1 |
| C. | \(2\sqrt 2 :1\) |
| D. | 4 : 1 |
| Answer» C. \(2\sqrt 2 :1\) | |
| 109. |
In the following circuit, the input voltage \({V_{in}}\) is \(100\;sin\left( {100\pi t} \right)\). For \(100\pi RC = 50\), the average voltages across \(R\) (in volts) under steady-state is nearest to |
| A. | 100 |
| B. | 31.8 |
| C. | 200 |
| D. | 63.6 |
| Answer» D. 63.6 | |
| 110. |
A half-wave rectifier has an input voltage of 240 V rms. If the step-down transformer has a turns ratio of 8 ∶ 1, what is the peak load voltage? Ignore diode drop. |
| A. | 27.5 V |
| B. | 86.5 V |
| C. | 30.0 V |
| D. | 42.5 V |
| Answer» E. | |
| 111. |
In a full wave rectifier without filter, the ripple factor is |
| A. | 0.482 |
| B. | 1.21 |
| C. | 1.79 |
| D. | 2.05 |
| Answer» B. 1.21 | |
| 112. |
In a linear IC voltage regulator, series pass transistor always operates in _____ region. |
| A. | Active |
| B. | Saturation |
| C. | Cut-off |
| D. | All of the above |
| Answer» B. Saturation | |
| 113. |
If diodes are ideal in the circuit shown in the given figure, then determine the maximum value of Vout during the positive half of the input signal. |
| A. | Vp – 4V |
| B. | Vp – 6V |
| C. | 4V |
| D. | 6V |
| Answer» D. 6V | |
| 114. |
In the circuit shown below 18 V Zener diode has zero Zener resistance and a knee current of 2 mA. The minimum value of R so that voltage across it does not fall below 18 V is: |
| A. | 1000 Ω |
| B. | 500 Ω |
| C. | 9000 Ω |
| D. | 2000 Ω |
| Answer» B. 500 Ω | |
| 115. |
In case of full wave rectifier the ripple factor is |
| A. | 1.21 |
| B. | 0.50 |
| C. | 0.48 |
| D. | 1.00 |
| Answer» D. 1.00 | |
| 116. |
A tunnel diode is fabricated from: |
| A. | Ge |
| B. | Si |
| C. | GaAs |
| D. | Ge or GaAs |
| Answer» E. | |
| 117. |
Consider the circuit shown in the given figure. If the maximum value of input voltage is Vm, then what is the DC level of output voltage V0? |
| A. | Vm |
| B. | -Vm |
| C. | 2Vm |
| D. | -2Vm |
| Answer» B. -Vm | |
| 118. |
A voltage regulator is a circuit which |
| A. | Converts the ac voltage to dc voltage |
| B. | Smoothens the ac variation in dc output voltage |
| C. | Maintains a constant dc output voltage inspite of the fluctuations in ac input voltage or load current |
| D. | None of the above |
| Answer» D. None of the above | |
| 119. |
In a P-N-P transistor, majority charge carriers are: |
| A. | Holes |
| B. | Electrons |
| C. | Both 1 & 2 |
| D. | None of these |
| Answer» B. Electrons | |
| 120. |
For thyristors pulse triggering is preferred than dc triggering because: |
| A. | Gate dissipation is low |
| B. | Pulse system is simpler |
| C. | Triggering signal is required for short duration |
| D. | All the above |
| Answer» E. | |
| 121. |
A limiter circuit is also known as a: |
| A. | clamp circuit |
| B. | chopping circuit |
| C. | clipper circuit |
| D. | chopper circuit |
| Answer» D. chopper circuit | |
| 122. |
Determine the resonant frequency of an IMPATT diode having the following specifications:Carrier drift velocity: 2 × 107 cm/sDrift-region length: 5 μmMaximum operating voltage: 100 VMaximum operating current: 250 mAEfficiency: 20%Breakdown voltage: 90 V |
| A. | 16.67 GHz |
| B. | 15 GHz |
| C. | 20 GHz |
| D. | 25 GHz |
| Answer» D. 25 GHz | |
| 123. |
Consider the above circuit, for \({V_i} = {V_m}\sin \omega t\), the output voltage V0 for \({R_1} \to \infty\) will be: |
| A. | Zero |
| B. | Vm |
| C. | 2 Vm |
| D. | -Vm |
| Answer» D. -Vm | |
| 124. |
Figure shown below capacitor c is initially charged to V0 = 50 V with upper plate positive. Switch S is closed at t = 0. Current through the circuit at t = 0 and final voltage across C are respectively |
| A. | 15 A, 200 V |
| B. | 25 A, 250 V |
| C. | 20 A, 200 V |
| D. | 15 A, 150 V |
| Answer» B. 25 A, 250 V | |
| 125. |
A Silicon diode operating at a temperature of 300 K has a bias current of 2 mA. Find the dynamic resistanceTake: η = 1 |
| A. | 13 Ω |
| B. | 26 Ω |
| C. | 1.3 Ω |
| D. | 2.6 Ω |
| Answer» B. 26 Ω | |
| 126. |
Identify the given rectifier. |
| A. | Half-wave rectifier |
| B. | Full-wave rectifier |
| C. | Bridge rectifier |
| D. | Centre-tapped rectifier |
| Answer» B. Full-wave rectifier | |
| 127. |
For forward biased diode |
| A. | Transition capacitance is larger than diffusion capacitance |
| B. | Diffusion capacitance is larger than transition capacitance |
| C. | Both capacitances are having same value |
| D. | Cannot predict with certainty |
| Answer» C. Both capacitances are having same value | |
| 128. |
Match the two lists and choose the correct answer from the code given below:List IList II(a) vrms of half-wave rectifier output(i)\(\frac{(2V_m)}{π}\)(b) Vrms of bridge rectifier output(ii)\(\frac{(V_m)}{π}\)(c) Vdc (half-wave rectifier output)(iii) V(d) Vdc (full-wave rectifier output)(iv)\(\frac{(V)}{\sqrt2}\) |
| A. | (a) – (ii), (b) – (iii), (c) – (iv), (d) – (i) |
| B. | (a) – (iv), (b) – (iii), (c) – (i), (d) – (ii) |
| C. | (a) – (iii), (b) – (iv), (c) – (i), (d) – (ii) |
| D. | (a) – (iv), (b) – (iii), (c) – (ii), (d) – (i) |
| Answer» E. | |
| 129. |
If the diodes in the circuit shown are ideal and the breakdown voltage VZ of the Zener diode is 5 V, the power dissipated in the 100 Ω resistor (in watts) is_____ |
| A. | 0 |
| B. | 1 |
| C. | 25/100 |
| D. | 225/100 |
| Answer» B. 1 | |
| 130. |
A silicon diode is preferred to a germanium diode because of its |
| A. | Higher reverse current |
| B. | Lower reverse current and higher reverse break down voltage |
| C. | Higher reverse current and lower reverse break down voltage |
| D. | None of the above |
| Answer» C. Higher reverse current and lower reverse break down voltage | |
| 131. |
A half-wave rectifier circuit using ideal diode has an input voltage of 20 sin ωt Volt. Then average and rms values of output voltage respectively, are |
| A. | \(\frac{{10}}{\pi }V\;and\;5\;V\) |
| B. | \(\frac{{20}}{\pi }V\;and\;10\;V\) |
| C. | \(\frac{{20}}{\pi }V\;and\;5\;V\) |
| D. | \(\frac{{10}}{\pi }V\;and\;10\;V\) |
| Answer» C. \(\frac{{20}}{\pi }V\;and\;5\;V\) | |
| 132. |
A non-ideal diode is biased with a voltage of -0.03 V, and a diode current of I1 is measured. The thermal voltage is 26 mV and the ideality factor for the diode is 15/13. The voltage, in V, at which the measured current increases to 1.5 I1 is closest to: |
| A. | -0.02 |
| B. | -0.09 |
| C. | -1.50 |
| D. | -4.50 |
| Answer» C. -1.50 | |
| 133. |
A clamper circuit1. Adds or subtracts a dc voltage to or from a waveform2. Does not change the shape of the waveformWhich of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 134. |
Identify the given waveform |
| A. | Positive half wave rectifier |
| B. | Full wave rectifier |
| C. | Dual full wave rectifier |
| D. | Negative half wave rectifier |
| Answer» B. Full wave rectifier | |
| 135. |
In a full wave rectifier, the current in each diode flows for |
| A. | Half cycle of the input signal |
| B. | Full cycle of the input signal |
| C. | Quarter cycle of input signal |
| D. | Three fourth cycle of input signal |
| Answer» B. Full cycle of the input signal | |
| 136. |
A 1-phase diode bridge rectifier connected from 100 V rms ac supply is feeding a resistive, load Neglecting diode drop, the output average voltage is approximately. |
| A. | 90.0 V |
| B. | 63.7 V |
| C. | 141 V |
| D. | 45 V |
| Answer» B. 63.7 V | |
| 137. |
For the network given below, what is the value or RL that will turn the Zener diode ON and also what is the maximum wattage rating of the diode? |
| A. | 200 Ohm, 300 mW |
| B. | 250 Ohm, 300 mW |
| C. | 250 Ohm, 320 mW |
| D. | 300 Ohm, 350 mW |
| Answer» D. 300 Ohm, 350 mW | |
| 138. |
Consider the diode circuit shown below. The diode, D, obeys the current-voltage characteristic \({I_D} = {I_S}\left( {\exp \left( {\frac{{{V_D}}}{{n{V_T}\;}}} \right) - 1} \right)\), where n > 1, VT > 0, VD is the voltage across the diode and ID is the current through it. The circuit is biased so that voltage, V > 0 and current, I < 0. If you had to design this circuit to transfer maximum power from the current source (I1) to a resistive load (not shown) at the output, what values of R1 and R2 would you choose? |
| A. | Large R1 and large R2 |
| B. | Small R1 and small R2 |
| C. | Large R1 and small R2 |
| D. | Small R1 and large R2 |
| Answer» E. | |
| 139. |
If the input ( Vin ) to the circuit is a sine wave, the output will be |
| A. | Half - wave rectified sine wave |
| B. | Full - wave rectified sine wave |
| C. | Triangular wave |
| D. | Square wave |
| Answer» E. | |
| 140. |
_____ is an electromechanical device that consists of an actuator mechanically linked to a set of contacts. When an object comes into the contact with the actuator, the device operates the contacts to make or break an electrical connection. |
| A. | A relay |
| B. | A photoelectric switch |
| C. | A circuit breaker |
| D. | A limit switch |
| Answer» E. | |
| 141. |
Find the values of VO, VD2 and ID for the circuit given below: |
| A. | V0 = 2 VVD2 = 10 VID = 0.5 A |
| B. | V0 = 10 VVD2 = 2 VID = 0 A |
| C. | V0 = 5 VVD2 = 1 VID = 2 A |
| D. | V0 = 0 VVD2 = 12 VID = 0 A |
| Answer» E. | |
| 142. |
IC 7812 is a _____ voltage regulator. |
| A. | 78 V |
| B. | 8 V |
| C. | 21 V |
| D. | 12 V |
| Answer» E. | |
| 143. |
Consider the following diodes:1. Gunn diode2. Schottky diode3. Crystal diode4. Tunnel diodeWhich of these can be used as detector diodes? |
| A. | 1 and 2 only |
| B. | 2 and 4 only |
| C. | 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» C. 3 and 4 only | |
| 144. |
If the output of a voltage regulator varies from 15 to 14.7 V between the minimum and maximum load current, the load regulation is: |
| A. | 0 |
| B. | 1% |
| C. | 2% |
| D. | 5% |
| Answer» D. 5% | |
| 145. |
In an L-section filter, a bleeder resistance connected across the load |
| A. | provides good regulation for all values of load |
| B. | ensures lower PIV of the diodes |
| C. | ensures lower values of capacitance in the filter |
| D. | reduces ripple content |
| Answer» B. ensures lower PIV of the diodes | |
| 146. |
Assuming the diodes to be ideal in the figure, for the output to be clipped, the input voltage Vi must be outside the range |
| A. | -1 V to -2 V |
| B. | -2 V to -4 V |
| C. | +1 V to -2 V |
| D. | +2 V to -4 V |
| Answer» C. +1 V to -2 V | |
| 147. |
A 1N755 Zener diode is connected (in reverse biased mode) in series to a 620 Ω resistor and a 20 V DC supply. Calculate the diode current. |
| A. | 20.16 mA |
| B. | 12.16 mA |
| C. | 28.49 mA |
| D. | 30.12 mA |
| Answer» B. 12.16 mA | |
| 148. |
______ has the highest mobility. |
| A. | Ions |
| B. | Electrons |
| C. | Neutron |
| D. | Proton |
| Answer» C. Neutron | |
| 149. |
Peak factor for a half wave rectified sine wave is |
| A. | 1.41 |
| B. | 1.73 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 150. |
A zener diode is invariably used with |
| A. | Forward bias |
| B. | Reverse bias |
| C. | Either forward bias or reverse bias |
| D. | Zero bias |
| Answer» C. Either forward bias or reverse bias | |