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1) Which waveshaping circuits are preferred or selected for the transmission of specific part of any arbitrary waveform by allocating the reference level? a. Clipping Circuits b. Clamping Circuits c. Voltage Regulating Circuits d. Sampling Gate Circuits
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2) The shape of externally applied or an impressed control signal in a sampling gate is usually _____. a. Square b. Rectangular c. Diagonal d. Elliptical
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3) Which VVC diode consists of graded doping profile & functionally known as a 'snap diode? a. Varactor Diode b. Tunnel Diode c. Gunn Diode d. Step Recovery Diode
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4) Breakdown devices belonging to the category of solid-state devices are basically dependent on the phenomenon of __________ a. Zener Breakdown b. Avalanche Breakdown c. PN Junction Breakdown d. All of the above
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5) The FET used in Unijunction transistor govern the unique capability to control ________ a. large ac power with a large signal b. large ac power with a small signal c. small ac power with a small signal d. small ac power with a large signal
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6) Which property of UJT signifies the voltage division factor whose value is always supposed to be less than unity? a. Intrinsic Stand-off Ratio b. Extrinsic Stand-off Ratio c. Current to Resistance Ratio d. Voltage to Current Ratio
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7) What kind of waveforms are generated in UJT relaxation oscillator circuit due to additional involvement of external resistances in series configuration with the provision of corresponding base terminals? a. Square waveforms b. Triangular waveforms c. Saw-tooth waveforms d. Spike waveforms
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8) What will be the requirement of maximum & minimum number of blades strokes per minute if UJT controls the motor of an automobile with stand-off ratio of about 0.7, capacitance of 40 μF and the charging resistances of 40 k & 480 k potentiometer connected in series combination? a. 24 & 2.2 seconds respectively b. 28 & 2.4 seconds respectively c. 30 & 2.7 seconds respectively d. 32 & 2.9 seconds respectively
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9) PUT gets turned ON only when there is an excession of ________ over the programmable level. a. Anode voltage b. Cathode voltage c. Biasing voltage d. Gate voltage
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10) What is the value of anode current of SCR comprising two-transistor analogy with the gate current of 40 mA if the gain of PNP & NPN transistors are 0.3 & 0.4 respectively? a. 253 mA b. 113 mA c. 73.33 mA d. 53.33 mA
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11) Which thyristor behaves like two SCRs connected in parallel configuration & upside down corresponding to each other? a. Diac b. Triac c. LASCR d. Shockley Diode
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12) Determine the input voltage necessary to cause the breakdown in SCR for 200 Ω resistance connected in series if the required gate current for firing is 6 mA. a. 2.7 V b. 2.9 V c. 1.9 V d. 1.2 V
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13) A device which possesses the potential to convert a sinusoidal input waveform (zero average value) into a unidirectional waveform with a non-zero average component is known as ___________ a. Inverter b. Rectifier c. Chopper d. Clamper
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14) Which parameter plays a cardinal role in determining the ratings of transformer while designing any power supply? a. Ripple Factor b. Transformer Utilization Factor (TUF) c. Peak Inverse Voltage d. Efficiency
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15) The significant reason(s) for using bridge wave rectifier is (are) a. Less PIV rating b. No necessity of centre - tap winding usage c. Suitability for high voltage applications d. All of the above
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16) What is / are the possible consequences of increasing the filter capacitance? a. Reduction in magnitude of ripple voltage b. Reduction in peak current of diode c. Reduction in Vdc towards the limiting value Vip d. All of the above
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17) The conduction angle in controlled rectification process under the proper firing conditions can be controlled by _______ a. Thyristor b. Rectifier c. Comparator d. Regulator
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18) Estimate the power delivered to the load circuit for firing angles of 450 & 900 respectively in a controlled form of half-rectifier circuit with peak supply voltage of about 300 V across the load resistor of 2 kΩ. a. 0.502 W & 0.244 W respectively b. 1.240 W & 0.062 W respectively c. 2.120 W & 1.670 W respectively d. 3.240 W & 1.097 W respectively
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19) What will be the average dc output voltage of a chopper which is supplied by 500 V dc with ON time of 20ms and OFF time of 15 ms? a. 150 V b. 230 V c. 285 V d. 325 V
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20) Which component reduces the difference between no load and full load voltage by ameliorating the regulation when connected across the output of filter? a. Shunt Capacitor b. Series Inductor c. Bleeder Resistor d. Silicon Controlled Rectifier
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