Analog Electronics Model Question
Module: 1 [Resistor, Capacitor, and Inductors]
1. Capacitors & inductors
(a)Are energy storing devices
(b)Do not not store energy
(c)Are independent nsources
Answer: (a)
2. The charge on a capacitor is given by
(a) q=C dv/dt
(b) ∫ C dv
(c) q= Cv
(d) q= c/v
Answer: (c)
3. Unit of a resistor is
(a) Ohm
(b)Henry
(c)Farad
(d) Gain
Answer (a)
4. 1 ohm is defined as
(a) 1 A/V
(b) 2 A/V
(c) 1 V/A
(d) 2 V/A
Answer: (c)
5. Voltage across an inductor is given by
(a) v = I dL/dt
(b) v = ∫I dL
(c) v = ∫Ldi
(d) v = L di/dt
Answer: (d)
Module:2 [Electric Circuit Laws]
- Power P =
(a) V²i
(b) Ri²
(c)Rv²
(d)R²v²
Answer: (b)
2.Condustance is
(a) i/v
(b) v/R
(c) v/i
(d) vi
Answer: (a)
3.Unit of conductance is
(a) watts
(b) ampere
(c) volt
(d) siemens
Answer: (d)
4.Node is a point of connection of
(a)A single element
(b)Three elements only
(c)Two or more elements
(d)One or more elements
Answer:(c)
5.kirchoff’s current law state that the sum of currents at a node is
(a) infinity
(b) finite
(c) zero
(d) none of the above
Answer:(c)
6. kirchoff’s voltage law state that the algebraic sum of voltage around a loop are
(a) Zero
(b) finite
(c) infinity
(d) none of the above
Answer:(a)
7. In Thevenin’s theorem the replaced source is
(a) open circuit current source
(b) short circuit current source
(c) Open ciruit voltage source
(d) Short circuit voltage source
Answer: (c)
8. In Norton’s theorem the replaced source is
(a) Open circuit current source
(b) Short circuit comet source
(c) Open circuit voltage source
(d) Short circuit voltage source
Answer: (b)
9. To find Thevenin equivalent resistant all the voltage sources are
(a) short circuited
(b) Open circuited
(c) No change
(d) None of the above
Answer: (a)
10. Find Thevenin equivalent circuit the current circuits are
(a) short circuited
(b) open circuited
(c) No change
(d) None of the above
Answer : (b)
11. if the current flowing through a 100hm resistor is 2A, find the power absorbed is
(a)20w
(b)5w
(c)0.2W
(d)40w
Answer :(d)
12. if the PD occurs 50 ohm resistor is 10V ,the power absorbed is
(a) 50W
(b) 20w
(c) 2w
(d) 0.5W
Answer : (b)
Module 3 [Semiconductor Diodes]
1-Diode is
(a)Bidirectional device
(b)Multidirectional device
(c)Unidirectional device
(d)None of above
Answer: (c)
2-Cut in voltage of germanium diode is
(a)0.7v
(b)0.3v
(c)1v
(d)0v
Answer: (b)
3-Cut in voltage of silicon diode is
(a)0.7v
(b)0.3v
(c)1v
(d)0v
Answer: (a)
4-With the increase in junction temperature the diode current
(a)Do not change
(b)Decreases
(c)Increases
(d)None of above
Answer: (c)
5-Zener diode is used as
(a)Voltage source
(b) Current source
(c)Voltage regulator
(d)None of above
Answer: (c)
6-The reverse baised diodes current is in
(a)Milliampered
(b)Microampheres
(c)Ampheres
(d)Picoampheres
Answer: (b)
7-Zener diodes forward characteristics is same as diode
(a)True
(b)False
Answer: True
8-Zener diodes reverse characteristics is same as diode
(a)True
(b)False
Answer: False
Module 4 [Rectifiers]
1-Rectifier is used to convert
(a)AC to DC
(b)DC to AC
(c)DC to DC
(d)AC to AC
Answer: (a)
2-The device used as rectifier is
(a)Transistor
(b)Zener Diode
(c)Diode
(d)LED
Answer: (c)
3-The half wave rectifier conducts
(a)For both half cycles
(b)For Only one half cycle
(c)At no time
(d)None of above
Answer: (b)
4-The full wave rectifier conducts
(a)For both half cycles
(b)For Only one half cycle
(c)At no time
(d)None of above
Answer: (a)
5-Ripple factor in an half wave rectifier is
(a)1.0
(b)1.44
(c)0.482
(d)1.21
Answer: (d)
6-Ripple factor in a full wave rectifier is
(a)1.0
(b)1.44
(c)0.482
(d)1.21
Answer: (d)
7-Efficiency of half wave rectifier compared to half wave rectifier is
(a)Same
(b)Low
(c)High
(d)Very High
Answer: (b)
8-Cost of full wave rectifier compared to half wave rectifier is
(a)High
(b)Low
(c)Same
(d)Very Low
Answer: (a)
9-The number of diodes required in a bridge rectifier are
(a)1
(b)2
(c)3
(d)4
Answer: (d)
10- A Filter in a increasing ripple
(a) Increasing ripple
(b) Decreasing
(c) Not changing ripple
(d) None of the above
Answer: (b)
11- In half wave rectifier VM should
(a) Not be greater than PIV
(b) Be greater than PIV
(c) Same as PIV
(d) None of above
Answer: (a)
12- In a half wave rectifier VM = 3.14V, the DC voltage is
(a) 2V
(b) 31.4V
(c) IV
(d) 0.314V
Answer: (c)
13- In a full wave rectifier if VM = 3.14, DC voltage is
(a) 2V
(b) 31.4V
(c) 1V
(d) 0.314V
Answer: (a)
14- Cost of full wave rectifier compare to the bridge rectifier is
(a) High
(b) Low
(c) Same
(d) Very low
Answer: (a)
Module 5 [Bipolar Junction Transistor]
1. Number of junctions in a transistor one
(a) 1
(b) 2
(c) 3
(d) 4
Answer:(b)
2. Number of ways a transistor can be biased is
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (b)
3. Emitter current IE is given by
(a) IE = IC + IB
(b) IE = IC - IB
(c) IE = IB-IC
(d) IE = IC/IB
Answer: (a)
4. DC of transistor is
(a) IE/IC
(b)IC/IB
(c)IC/IE
(d)IE/IB
Answer: (a)
5.BDC of transistor is
(a) IC/IB
(b)IB/IC
(c)IC/IE
(d)IB/IE
Answer: (a)
6.Number of leads the transistor has
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (c)
7. Number of ways in which a transistor can be cnfigured is
(a) 1
(b 2
(c) 3
(d) 4
Answer: (c)
8. Given BDC of a transistor as 99 ,DC is
(a) 100
(b)0,99
(c)9,9
(d)1
Answer: (b)
9. Given LDC of a transistor 0,98, BDC is
(a) 50
(b) 98
(c) 49
(d) 51
Answer: (c)
10. If both junction are forwad biased the region of operation is
(a) Saturation
(b) Active
(c) Cut-off
(d) Inverted
Answer: (a)
11. If both junctions are renverse biase the region of operation is
(a) Saturation
(b) Active
(c) Cut-off
(d) Inverted
Answer: (c)
12. If emitter junction is forward biased & collector junction is reverse biased, the region of operation is
(a) Saturation
(b)Active
(c) Cut-off
(d)Inverted
13. If emitter junction is reverse biased and collection is forward biase,
(a) Saturation
(b) Active
(c) cut-off
(d) invented
Answer: (d)
MODULE 6 [BJT Transistor Amplifiers]
1. Voltage gain of a transistor where input voltage is Vs and output voltage is Vo is defined as
(a) Vs/Vo
(b) Vs + Vo
(c) Vo/Vs
(d) Vo x Vs
Answer: (c)
2. Most commonly used coupling method in a transistor amplifier is
(a) R-C coupling
(b) Transformer coupling
(c) Direct coupling
(d) None of the above
Answer: (a)
3. Multistage amplifier is used for
(a) Smaller gain
(b) Lager gain
(c) No gain
(d) None of the above
Answer: (b)
4. Voltage gain of an RC Coupled amplifier in mid-band
(a) Increases with frequency
(b) Decreases with frequency
(c) Do not depend on frequency
(d) Is not Constant
Answer: (d)
5. The voltage gain of an RC Couplet amplifier in low frequency region compared to mid band
(a) Increase with frequency
(b) Decrease with frequency
(c) Do not depend on frequency
(d) Is constant
Answer: (a)
6. The voltage gain of an RC Coupled amplifier in high frequency region compared to mid-bad
(a) Increase with frequency D
(b) Decreased with frequency
(c) Do not depend on frequency
(d) Is constant
7. The bandwidth of amplifier is defined as the frequencies at which voltages gain reduces to
(a) 100 %
(b) 70,7 %
(c) 29.3 %
(d) 0 %
Answer: (b)
8. In an amplifier circuit Re = 100 ohms . Rl = 1 K.ohms. The gain of the amplifier is
(a) 100 %
(b) 10 %
(c) 1000 %
(d) 0.1 %
Answer: (b)
9. Multistage amplifiers are used to get
(a) high gain
(b) low gain
(c) high input impedance
(d) low output impedance
Ans; A
MODULE 7 [Operational Amplifiers]
- An op-amp is designed to carry out
a)logical operations
(a)mathematical operations
(b)statistical operations
(c)scientific operations
Answer: (b)
- The gain of operational amplifier is
(a)very low
(b)moderately low
(c)moderately high
(d)very high
Answer: (d)
- The voltage gain of inverting amplifier is given by
(a)R/R1
(b)R1/R
(c)1+R1/R
(d)1+R/R1
Answer: (a)
- The voltage gain of a non volatile amplifier is
(a)R/R1
(b)R/R1
(c)1+R1/R
(d)1+R/R1
Answer: (d)
- Voltage gain of voltage follower is
(a)infinity
(b)zero
(c)1
(d)None of the above
Answer: (c)
- Voltage follower has
(a)very high input impedance and very low output impedance
(b)very low input impedance and very high output impedance
(c)equal output and input impedance
(d)none of the above
MODULE 8 [Terminal Devices]
- LED
a) emit visible light
b)emit current
a)emit heat
c)none of above
Answer: (a)
- Compare to LED LCD consume
a) more power
b)equal power
c)less power
d)zero power
Answer: (c)
- LCD require internal or external light source
a)true
b)false
Answer: (a)
- Thermistor is sensitive to
a)light
b)heat
c)current
d)voltage
Answer: (b)
- Transformer can be used as an amplifier
a)true
b)false
Answer: (b)
- Transformer is used to isolate source fro; load
a)true
b)false
Answer: (a)
- At lowest length the color by LED is
a)green
b)yellow
c)red
d)white
Answer: (a)
- A transformer hqs 100 primary winding and 10 secondary windings. if 10v are applied to primary the voltage at the secondary is
a)100v
b)110v
c)90v
d)1v
Answer: (d)
- For example if the primary current is 1A the secondary current is
a)10A
b)0.1A
c)11A
d)9A
Answer: (a)
Module 9 [Cathode Ray Oscilloscope]
- A cathode ray oscilloscope displays
a)Instantaneous voltage
b)RMS voltage
c)Average voltage
d)Peak voltage
Answer: (a)
- CRT is the heart of CRO
a)True
b)False
Answer: (a)
- Electron gun
a)Generates electrons
b)Focuses electrons
c)Disperses electrons
d)Fires electrons at a very high speed
Answer: (d)
- X deflection plates are positioned horizontally
a)True
b)False
Answer: (b)
- Y deflection plates are positioned horizontally
a)True
b)False
Answer: (b)
- When electrons strike fluorescent screen electron energy is converted to
a)Heat energy
b)Light energy
c)Kinetic energy
d)Electrical energy
Answer: (b)
- Number of electron guns in a dual beam oscilloscope are
a)1
b)2
c)3
d)4
Answer: (b)
- Number of electron gun in a dual trace oscilloscope are
a)1
b)2
c)3
d)4
Answer: (a)
- Lissajous figures are used to measure
a)Voltage
b)Current
c)Phase
d)Frequency
Answer: (d)