Unit – I Electronic Components & Signals
1. For 180 K ohm resistor with 10 % tolerance, the color band will be in the sequence of
a. Brown-grey-yellow-gold
b. Brown-grey-yellow-silver
c. Brown-blue-yellow-silver
d. Brown-grey-yellow-gold
Answer: brown-grey-yellow-silver
2. Transistor is
a. A passive component
b. Active component
c. None of these
d. Both a & b
Answer: active component
3. Inductor is
a. Active component
b. Passive component
c. None of these
d. Both a & b
Answer: passive component
4. In electronics the term IC denotes
a. Industrial control
b. Integrated circuits
c. Internal combustion
d. International circuits
Answer: integrated circuits
5. What is the unit of inductance?
a. Joule
b. Farad
c. Henry
d. Watts
Answer: henry
6. Which value is equal to one Pico farad?
a. 106 farad
b. 1012 farad
c. 10−6 farad
d. 10−12 farad
Answer: 10−12 farad
7. Which of the following elements comprise of the passive devices?
a. Resistors, capacitors & SCRs
b. Vacuum tubes, SCRs & diodes
c. Transformers, inductors & diodes
d. Transformers, TRIACs & DIACs
Answer: transformers, inductors & diodes
8. Active devices can also be used as …..
a. Amplifiers
b. Choppers
c. Converters
d. Inverters
Answer: amplifiers
9. A CRO is a
a. Cathode ray oscillator
b. Cathode ray oscilloscope
c. Capacitor- resistor oscillator
d. Capacitor- resistor output
Answer: cathode ray oscilloscope
10. There are two main characteristics of a resistor are ….
a. Current & voltage
b. Current & power
c. Resistance & power
d. Resistance & current
Answer: resistance & power
Unit – II Diodes & their Applications
1. The DC current through each diode in a bridge rectifier equals:
a. The load current
b. Half the DC load current
c. Twice the DC load current
d. One-fourth the DC load current
Answer: the load current
2. In a power supply diagram, which block indicates a smooth dc output?
a. Transformer
b. Filter
c. Rectifier
d. Regulator
Answer: regulator
3. Testing a good diode with an ohmmeter should indicate
a. High resistance when forward or reverse biased
b. Low resistance when forward or reverse biased
c. High resistance when reverse biased & low resistance when forward biased
d. High resistance when forward biased & low resistance when reverse biased
Answer: high resistance when reverse biased & low resistance when forward biased
4. Shunting the ac component away from the load is the task of a:
a. Transformer
b. Filter
c. Regulator
d. Rectifier
Answer: filter
5. When used as a voltage regulator, Zener diode is normally
a. Not biased
b. Forward biased
c. Reverse biased
d. None of the above
Answer: reverse biased
6. For a germanium diode, the barrier potential is
a. 0.3 volt
b. 0.3 eV
c. 0.7 volt
d. 0.7 eV
Answer: 0.3 volt
7. The output from an unfiltered half wave or full wave rectifier is a
a. Smooth DC voltage
b. Steady DC voltage
c. Pulsating DC voltage
d. AC voltage
Answer: pulsating DC voltage
8. In the breakdown region, a Zener diode behaves like a ……… source
a. Constant voltage
b. Constant current
c. Constant resistance
d. None of the above
Answer: constant voltage
9. A Zener diode has …… breakdown
a. Undefined
b. Zero
c. Sharp
d. None of the above
Answer: sharp
10. The maximum efficiency of a half wave rectifier is ……
a. 40.6 %
b. 81.2 %
c. 50 %
d. 25 %
Answer: 40.6 %
Unit- III Bipolar Junction Transistor
1. In a BJT
a. The base region is sandwiched between emitter & collector
b. The collector is sandwiched between base & emitter
c. The emitter region is sandwiched between base & collector
d. None of the above
Answer: the base region is sandwiched between emitter & collector
2. Amplifiers & oscillators using BJT, operate in …… region
a. Inverted mode
b. Active….
c. Cut off
d. Saturation
Answer: active
3. The arrow in a transistor terminal represents
a. Emitter
b. Collector
c. Base
d. None of the above
Answer: emitter
4. Transistor is a device which is a
a. Transferring voltage device
b. Current operated one
c. Power operated one
d. Voltage operated one
Answer: current operated one
5. Transistor works as an open switch when emitter junction is ….. biased & collector junction is ….biased
a. Forward, forward
b. Reverse, reverse
c. Reverse, forward
d. Forward, reverse
Answer: reverse, reverse
6. When a transistor is in active region the resistance is between
a. Emitter to collector
b. Base to collector
c. Emitter to base
d. All of the above
Answer: base to collector
7. In a NPN transistor, ………. are the minority carrier.
a. Electron
b. Holes
c. Donor ions
d. Acceptor ions
Answer: holes
8. In a transistor ……..
a. IB=IC+IB
b. IC=IE+IB
c. IE=IC+IB
d. IE=IC-IB
Answer: IE=IC+IB
9. The value of α of a transistor is ……
a. 0
b. 1
c. More than 1
d. Less than 1
Answer: less than 1
10. The value of β of a transistor is ……
a. Between 20 & 500
b. 1
c. Less than 1
d. 0
Answer: between 20 & 500