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UNIT I - Introduction to Electronics MCQs 101-150
101. Due to large. ...... , capacitor holds its entire charge.
a. charging current
b. time constant
c. discharging current
d. none of these
Ans: b
102. Due to the ........time constant the capacitor holds its entire charge.
a. zero
b. negative
c. very large
d. unity
Ans: c
103. For a HWR using RL=1500Ω, a capacitor filter is used with C=100μF then its ripple factor at 50HZ is.......
a. 0.115
b. 0.577
c. 0.0288
d. 0.0385
Ans: d
104. For a FWR using RL=1000Ω, a capacitor filter is used with C=100μF then its ripple factor at 50HZ is.......
a. 0.115
b. 0.577
c. 0.0288
d. 0.0385
Ans: c
105. In a HWR using capacitor filter of 50μF, Esm=42V and Idc=2 mA then its output d.c. voltage is V.
a. 41.6
b. 42
c. 41.8
d. 55
Ans: a
106. In a FWR using capacitor filter of 50μF, Esm=42V and Idc=2 mA then its output d.c. voltage is V.
a. 41.6
b. 42
c. 41.8
d. 55
Ans: c
107. As load resistance increases, the ripple
factor of capcitor filter...........
a. decreases
b. increases
c. remains constant
d. none of these
Ans: a
108. As the value of filter capacitor decreases, the ripple factor of capacitor filter........
a. decreases
b. increases
c. both a and b
d. None of the above
Ans: b
109. As the value of filter capacitor increases, the ripple factor of capacitor filter........
a. decreases
b. increases
c. both a and b
d. None of the above
Ans: a
110. As load resistance decreases, the ripple factor of capcitor filter...........
a. decreases
b. increases
c. remains constant
d. none of these
Ans: b
111. As the value of filter capacitor increases..............
a. ripple factor increases
b. initial surge current increases
c. regulation increases
d. all of these
Ans:b
111. A capacitor of 470μF is used as filter for a FWR using maximum input voltage of 30V at 50 HZ. Then its output d.c. voltage is.....V if RL=100Ω.
a. 35.55
b. 25.94
c. 27.96
d. 39.54
Ans: c
112. A capacitor of 470μF is used as filter for a HWR using maximum input voltage of 30V at 50 HZ. Then its output d.c. voltage is.....V if RL=100Ω.
a. 35.55
b. 25.94
c. 27.96
d. 39.54
Ans: b
113. A capacitor of 100μF is used as a filter for HWR supplying a load of RL=1000Ω then ripple factor is............
a. 0.002
b. 0.048
c. 0.0355
d. 0.0577
Ans: d
114. A capacitor of 470μF is used as a filter for bridge rectifier supplying a load of RL=1000Ω then ripple factor is............
a. 0.0288
b. 0.00614
c. 0.00355
d. 0.00577
Ans: b
115. The output d.c. voltage of a rectifier using a capacitor filter is 20V while its ripple factor is 2.88% then the r.m.s. value of ripple voltage is ..
a. 0.288
b. 0.576
c. 0.347
d. 0.144
Ans: b
116. If the rms value of ripple voltage is 0.2886V then peak to peak value of the ripple voltage is.........V assuming triangular nature of the ripple voltage.
a. 0.204
b. 0.408
c. 0.5
d. 1
Ans: b
117. In a filter circuit.........is always connected in series with the load.
a. resistor
b. inductor
c. capacitor
d. none of these
Ans: b
118. Ripple factor...............as the value of filter capacitor increases.
a. remains same
b. decreases
c. increases
d. none of these
Ans: b
119. The ripple factor for the capacitor filter is ............for FWR.
a. 1/4√3fCRL
b. 1/2fCRL
c. 1/2πfCRL
d. 1/πfCRL
Ans: a
120. The ripple factor for the capacitor filter is ............for HWR.
a. 1/4√3fCRL
b. 1/2fCRL
c. 1/2πfCRL
d. 1/2√3fCRL
Ans: d
121.The ripple factor for the capacitor filter is ............for Bridge FWR rectifier.
a. 1/4√3fCRL
b. 1/2fCRL
c. 1/2πfCRL
d. 1/2√3fCRL
Ans: a
122. If looking from the rectifier side, the first element in the filter is a capacitor then it is called filter.
a. Choke input
b. capacitor
c. π
d. RC
Ans: b
123. In a filter circuit........ is always connected in parallel with the load.
a. resistor
b. inductor
c. capacitor
d. none of these
Ans: c
124. For FWR with capacitor filter, diode conducts for....... half cycle.
a. less than
b. more than
c. equal to
d. none of these
Ans: a
125. The circuits used to remove unwanted portion of waveform without disturbing the remaining part are called..........
a. clampers
b. clippers
c. chopper
d. integrator
Ans: b
126. The clipper circuits are also called as.........
a. filters
b. rectifiers
c. limiters
d. integrators
Ans: c
127. In a clamper,........ is necessary in addition to a diode.
a. transistor
b. inductor
c. capacitor
d. none of these
Ans: c
128.One of the application of zener diode is
a. Clipper
b. Clamper
c. Voltage regulator
d. all above
Ans: c
129. Clipper circuit are used for
a. rectification
b. Removing part of wave form
c. Shiftingof DC level
d. All
Ans: b
130.Clamper circuit are used for
a. rectification
b. Removing part of wave form
c. Shifting of DC level
d. All
Ans: c
131. Positive clampers adds.............. DC voltage to the AC input
a. Positive
b. negative
c. zero
d. both
Ans: a
132.The basic circuit of half wave doubleris
a. Clamper
b. Rectifier
c. Clipper
d. Regulator
Ans: a
133. The basic circuit of full wave doubleris
a. Clamper
b. Rectifier
c. Clipper
d. Regulator
Ans: b
134.Series Negative clipper will clip off
a. positive half cycle of i/p
b. both half cycle of i/p
c. negative half cycle of i/p
d. none
Ans: c
135. Negative clampers add a DC voltage to the AC input
a. Positive
b. negative
c. zero
d. both
Ans: b
136. Series Positive clipper will clip off
a. positive half cycle of i/p
b. both half cycle of i/p
c. negative half cycle of i/p
d. none
Ans: a
137. In a series clipper, ............ is connected inn series with load.
a. Diode
b. inductor
c. transistor
d. capacitor
Ans: a
138. In a...........Clipper, a diode is connected in parallel with the load.
a. series
b. combinational
c. parallel
d. two way
Ans: c
139. A negative clipper clips off...........portion of the input waveform.
a. positive
b. negative
c. peak
d. none of these
Ans: b
140. A positive clipper clips off.......... portion of the input waveform.
a. positive
b. negative
c. peak
d. none of these
Ans: a
141. In a series clipper, for a clipping region, the diode must be in ...........condition.
a. forward biased
b. reverse biased
c. none of these
d. a and b
Ans: b
142. In a series clipper, for a transmitting region, the diode must be in........... condition.
a. forward biased
b. reverse biased
c. none of these
d. a and b
Ans: a
143. In a series clipper, the slope of the transfer characteristics in transmitting region is............
a. zero
b. unity
c. infinite
d. negative
Ans: b
144. In a series clipper, the slope of the transfer characteristics in clipping region is............
a. zero
b. unity
c. infinite
d. negative
Ans: a
145. In a parallel clipper, Vo = Vin can be obtained in transmitting region by making............
a. R1>>RL
b. R1=RL
c. R1<<RL
d. none of these
Ans: c
146. In a combinational clipper, when both the diodes are off, it produces........... action.
a. clipping
b. transmitting
c. exponential
d. none of these
Ans: b
147. In a ............clamper, the capacitor gets charged during first quarter of the negative cycle of the input.
a. positive
b. negative
c. combinational
d. two way
Ans: a
148. In a ............clamper, the capacitor gets charged during first quarter of the positive cycle of the input.
a. positive
b. negative
c. combinational
d. two way
Ans: b
149. Once charged to peak value, a capacitor acts as......... in a clamper.
a. filter
b. multiplier
c. battery
d. rectifier
Ans: c
150. In a clamper, the analysis must start considering that part of the input which .........
a. reverse biases the diode
b. forward biases the diode
c. discharges the capacitor
d. none of these
Ans: b
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