Electronics Objective Questions Answers
Electronics Objective Questions Answers
Note:Refer Answers are given at the end
1.] The resistance of a good conductor _____________ with temperature.
a) increases
b) decreases
c) can’t say
d) none of the above
2.] The void (or gap) separating conduction band and valence band, and no electron can exist in this void is termed as ______________.
a) valence band
b) energy band
c) conduction band
d) forbidden band
3.] A semiconductor to which an impurity is added with view to increase its conductivity is termed as __________________.
a) intrinsic semiconductor
b) extrinsic semiconductor
c) p-type semiconductor
d) n-type semiconductor
4.] In a n-type semiconductor material holes are ________________.
a) majority charge carriers
b) minority charge carriers
c) donor atoms
d) acceptor atoms
5.] If an external voltage is applied across the p-n junction such that the depletion layer widens and the barrier potential increases, the p-n junction is said to be ______________.
a) forward biased
b) reverse biased
c) un-biased
d) no-biased
6.] Power that is measured in volt-amperes is called
a) impedance power
b) reactive power
c) true power
d) apparent power
7.] When both inputs of a J-K flip-flop cycle, the output will
a) be invalid
b) not change
c) change
d) toggle
8.] Most demultiplexers facilitate which of the following?
a) decimal to hexadecimal
b) single input, multiple outputs
c) ac to dc
d) odd parity to even parity
9.] The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
a) quantization
b) accuracy
c) resolution
d) monotonicity
10.] Good insulators
a) have few electrons in their outer shells
b) have a large dielectric strength
c) have a small breakdown voltage
d) have many electrons in the nucleus
11.] The capacitor that produces an ac ground is called an
a) coupling capacitor
b) dc open
c) bypass capacitor
d) ac open
12.] The depletion-mode MOSFET
a) can operate with only positive gate voltages
b) can operate with only negative gate voltages
c) cannot operate in the ohmic region
d) can operate with positive as well as negative gate voltages
13.] What causes the piezoelectric effect?
a) heat or dissimilar metals
b) pressure on a crystal
c) water running on iron
d) a magnetic field
14.] A TRIAC:
a) can trigger only on positive gate voltages
b) can trigger only on negative gate voltages
c) cannot be triggered with gate voltages
d) can be triggered by either a positive or a negative gate voltage
15.] When does maximum power transfer happen from the source to the load?
a) When the source resistance is greater than the load resistance
b) When the source resistance is less than the load resistance
c) When there is negligible source resistance
d) When the source resistance equals the load resistance
16.] Which resistive component is designed to be temperature sensitive?
a) Thermistor
b) Rheostat
c) Potentiometer
d) Photoconductive cell
17.] How many valence shell electrons are there in semiconductor atoms?
a) 16
b) 8
c) 4
d) 2
18.] When transistors are used in digital circuits they usually operate in the:
a) active region
b) breakdown region
c) saturation and cutoff regions
d) linear region
19.] A current ratio of IC/IE is usually less than one and is called:
a) beta
b) theta
c) alpha
d) omega
20.] A Wheatstone bridge can be used to determine an unknown
a) Resistance
b) Current
c) Voltage
d) Power
21.] Minority carriers are many times activated by:
a) heat
b) pressure
c) diopants
d) forward bias
22.] The DIAC is a:
a) transistor
b) unidirectional device
c) three-layer device
d) bidirectional device
23.] A transducer's function is to:
a) transmit electrical energy
b) convert energy
c) produce mechanical energy
d) prevent current flow
24.] What device is similar to an RTD but has a negative temperature coefficient?
a) Strain gauge
b) Thermistor
c) Negative-type RTD
d) Thermocouple
25.] The silicon-controlled rectifier can be turned off?
a) by a negative gate pulse
b) by forced commutation
c) with the off switch
d) when the breakover voltage is exceeded
26.] The change in value of an analog signal during the conversion process produces what is called the
a) quantization error
b) resolution error
c) Nyquist error
d) sampling error
27.] The output voltage of a typical thermocouple is
a) less than 100 mV
b) greater than 1 V
c) Thermocouples vary resistance, not voltage
d) None of the above
28.] Holding current for an SCR is best described as
a) the minimum current required for turn-off
b) the current required before an SCR will turn on
c) the amount of current required to maintain conduction
d) the gate current required to maintain conduction
29.] What is the moving part of a linear variable differential transformer?
a) Primary
b) Secondary
c) Diaphragm
d) Core
30.] Power stored from the source and then returned to the source is called
a) apparent power
b) impedance power
c) reactive power
d) true power
31.] Which of the following memories uses a MOSFET and a capacitor as its memory cell?
a) SRAM
b) DRAM
c) ROM
d) DROM
32.] How many storage locations are available when a memory device has twelve address lines?
a) 144
b) 512
c) 2048
d) 4096
33.] A nonvolatile type of memory that can be programmed and erased in sectors, rather than one byte at a time is:
a) flash memory
b) EPROM
c) EEPROM
d) MPROM
34.] When referring to instruction words, a mnemonic is:
a) a short abbreviation for the operand address
b) a short abbreviation for the operation to be performed
c) a short abbreviation for the data word stored at the operand address
d) shorthand for machine language
35.] The software used to drive microprocessor-based systems is called:
a) assembly language programs
b) firmware
c) BASIC interpreter instructions
d) flowchart instructions
36.] The number of bits used to store a BCD digit is:
a) 8
b) 4
c) 1
d) 2
37.] The weight of the LSB as a binary number is:
a) 1
b) 2
c) 3
d) 4
38.] 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
39.] With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
a) 0 degrees
b) 90 degrees
c) 180 degrees
d) 360 degrees
40.] How many NAND circuits are contained in a 7400 NAND IC?
a) 1
b) 2
c) 4
d) 8
41.] Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?
a) OR gates only
b) AND gates and NOT gates
c) OR gates and NOT gates
d) AND gates, OR gates, and NOT gates
42.] An RL integrator and an RC differentiator can act as what types of filters, respectively?
a) low-pass, low-pass
b) low-pass, high-pass
c) high-pass, high-pass
d) high-pass, low-pass
43.] The unit of flux density is known as
a) magnetomotive force
b) a weber
c) a maxwell
d) a tesla
44.] Which two values are plotted on a B-H curve graph?
a) Reluctance and flux density
b) Permeability and reluctance
c) Magnetizing force and permeability
d) Flux density and magnetizing force
45.] What theorem replaces a complex network with an equivalent circuit containing a source voltage and a series resistance?
a) Multinetwork b) Norton
c) Thevenin d) Superposition
46.] What is a varistor?
a) a voltage-dependent resistor
b) a voltage-dependent diode
c) a current-dependent resistor
d) a current-dependent diode
47.] When a parallel circuit resonates it is said to:
a) flywheel b) oscillate
c) both of the above d) none of the above
48.] When checking a good SCR or TRIAC with an ohmmeter it will:
a) show high resistance in both directions
b) show low resistance with positive on anode and negative on cathode, and high resistance when reversed
c) show high resistance with negative on anode and positive on cathode, and low resistance when reversed
d) show low resistance in both directions
49.] Increasing the number of turns of wire on the secondary of a transformer will
a) increase the secondary current
b) decrease the secondary current
c) have no effect on the secondary current
d) increase the primary current
Answers
1.] The resistance of a good conductor _____________ with temperature.
a) increases
b) decreases
c) can’t say
d) none of the above
2.] The void (or gap) separating conduction band and valence band, and no electron can exist in this void is termed as ______________.
a) valence band
b) energy band
c) conduction band
d) forbidden band
3.] A semiconductor to which an impurity is added with view to increase its conductivity is termed as __________________.
a) intrinsic semiconductor
b) extrinsic semiconductor
c) p-type semiconductor
d) n-type semiconductor
4.] In a n-type semiconductor material holes are ________________.
a) majority charge carriers
b) minority charge carriers
c) donor atoms
d) acceptor atoms
5.] If an external voltage is applied across the p-n junction such that the depletion layer widens and the barrier potential increases, the p-n junction is said to be ______________.
a) forward biased
b) reverse biased
c) un-biased
d) no-biased
6.] Power that is measured in volt-amperes is called
a) impedance power
b) reactive power
c) true power
d) apparent power
7.] When both inputs of a J-K flip-flop cycle, the output will
a) be invalid
b) not change
c) change
d) toggle
8.] Most demultiplexers facilitate which of the following?
a) decimal to hexadecimal
b) single input, multiple outputs
c) ac to dc
d) odd parity to even parity
9.] The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
a) quantization
b) accuracy
c) resolution
d) monotonicity
10.] Good insulators
a) have few electrons in their outer shells
b) have a large dielectric strength
c) have a small breakdown voltage
d) have many electrons in the nucleus
11.] The capacitor that produces an ac ground is called an
a) coupling capacitor
b) dc open
c) bypass capacitor
d) ac open
12.] The depletion-mode MOSFET
a) can operate with only positive gate voltages
b) can operate with only negative gate voltages
c) cannot operate in the ohmic region
d) can operate with positive as well as negative gate voltages
13.] What causes the piezoelectric effect?
a) heat or dissimilar metals
b) pressure on a crystal
c) water running on iron
d) a magnetic field
14.] A TRIAC:
a) can trigger only on positive gate voltages
b) can trigger only on negative gate voltages
c) cannot be triggered with gate voltages
d) can be triggered by either a positive or a negative gate voltage
15.] When does maximum power transfer happen from the source to the load?
a) When the source resistance is greater than the load resistance
b) When the source resistance is less than the load resistance
c) When there is negligible source resistance
d) When the source resistance equals the load resistance
16.] Which resistive component is designed to be temperature sensitive?
a) Thermistor
b) Rheostat
c) Potentiometer
d) Photoconductive cell
17.] How many valence shell electrons are there in semiconductor atoms?
a) 16
b) 8
c) 4
d) 2
18.] When transistors are used in digital circuits they usually operate in the:
a) active region
b) breakdown region
c) saturation and cutoff regions
d) linear region
19.] A current ratio of IC/IE is usually less than one and is called:
a) beta
b) theta
c) alpha
d) omega
20.] A Wheatstone bridge can be used to determine an unknown
a) Resistance
b) Current
c) Voltage
d) Power
21.] Minority carriers are many times activated by:
a) heat
b) pressure
c) diopants
d) forward bias
22.] The DIAC is a:
a) transistor
b) unidirectional device
c) three-layer device
d) bidirectional device
23.] A transducer's function is to:
a) transmit electrical energy
b) convert energy
c) produce mechanical energy
d) prevent current flow
24.] What device is similar to an RTD but has a negative temperature coefficient?
a) Strain gauge
b) Thermistor
c) Negative-type RTD
d) Thermocouple
25.] The silicon-controlled rectifier can be turned off?
a) by a negative gate pulse
b) by forced commutation
c) with the off switch
d) when the breakover voltage is exceeded
26.] The change in value of an analog signal during the conversion process produces what is called the
a) quantization error
b) resolution error
c) Nyquist error
d) sampling error
27.] The output voltage of a typical thermocouple is
a) less than 100 mV
b) greater than 1 V
c) Thermocouples vary resistance, not voltage
d) None of the above
28.] Holding current for an SCR is best described as
a) the minimum current required for turn-off
b) the current required before an SCR will turn on
c) the amount of current required to maintain conduction
d) the gate current required to maintain conduction
29.] What is the moving part of a linear variable differential transformer?
a) Primary
b) Secondary
c) Diaphragm
d) Core
30.] Power stored from the source and then returned to the source is called
a) apparent power
b) impedance power
c) reactive power
d) true power
31.] Which of the following memories uses a MOSFET and a capacitor as its memory cell?
a) SRAM
b) DRAM
c) ROM
d) DROM
32.] How many storage locations are available when a memory device has twelve address lines?
a) 144
b) 512
c) 2048
d) 4096
33.] A nonvolatile type of memory that can be programmed and erased in sectors, rather than one byte at a time is:
a) flash memory
b) EPROM
c) EEPROM
d) MPROM
34.] When referring to instruction words, a mnemonic is:
a) a short abbreviation for the operand address
b) a short abbreviation for the operation to be performed
c) a short abbreviation for the data word stored at the operand address
d) shorthand for machine language
35.] The software used to drive microprocessor-based systems is called:
a) assembly language programs
b) firmware
c) BASIC interpreter instructions
d) flowchart instructions
36.] The number of bits used to store a BCD digit is:
a) 8
b) 4
c) 1
d) 2
37.] The weight of the LSB as a binary number is:
a) 1
b) 2
c) 3
d) 4
38.] 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
39.] With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
a) 0 degrees
b) 90 degrees
c) 180 degrees
d) 360 degrees
40.] How many NAND circuits are contained in a 7400 NAND IC?
a) 1
b) 2
c) 4
d) 8
41.] Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?
a) OR gates only
b) AND gates and NOT gates
c) OR gates and NOT gates
d) AND gates, OR gates, and NOT gates
42.] An RL integrator and an RC differentiator can act as what types of filters, respectively?
a) low-pass, low-pass
b) low-pass, high-pass
c) high-pass, high-pass
d) high-pass, low-pass
43.] The unit of flux density is known as
a) magnetomotive force
b) a weber
c) a maxwell
d) a tesla
44.] Which two values are plotted on a B-H curve graph?
a) Reluctance and flux density
b) Permeability and reluctance
c) Magnetizing force and permeability
d) Flux density and magnetizing force
45.] What theorem replaces a complex network with an equivalent circuit containing a source voltage and a series resistance?
a) Multinetwork b) Norton
c) Thevenin d) Superposition
46.] What is a varistor?
a) a voltage-dependent resistor
b) a voltage-dependent diode
c) a current-dependent resistor
d) a current-dependent diode
47.] When a parallel circuit resonates it is said to:
a) flywheel b) oscillate
c) both of the above d) none of the above
48.] When checking a good SCR or TRIAC with an ohmmeter it will:
a) show high resistance in both directions
b) show low resistance with positive on anode and negative on cathode, and high resistance when reversed
c) show high resistance with negative on anode and positive on cathode, and low resistance when reversed
d) show low resistance in both directions
49.] Increasing the number of turns of wire on the secondary of a transformer will
a) increase the secondary current
b) decrease the secondary current
c) have no effect on the secondary current
d) increase the primary current
Answers
1.] The resistance of a good conductor _______ with temperature.
a) increases
2.] The void (or gap) separating conduction band and valence band, and no electron can exist in this void is termed as
______________.
d) forbidden band
3.] A semiconductor to which an impurity is added with view to increase its conductivity is termed as __________________.
b) extrinsic
semiconductor
4.] In a n-type semiconductor material holes are ______________.
b) minority charge
carriers
5.] If an external voltage is applied across the p-n junction such that the depletion layer widens and the barrier potential
increases, the p-n junction is said to be ______________.
b) reverse biased
6.] Power
that is measured in volt-amperes is called
d) apparent
power
7.] When both
inputs of a J-K flip-flop cycle, the output will
b) not
change
8.] Most
demultiplexers facilitate which of the following?
b) single
input, multiple outputs
9.] The
difference between analog voltage represented by two adjacent digital codes, or
the analog step size, is the:
c) resolution
10.] Good
insulators
b)
have a large dielectric strength
|
11.] The
capacitor that produces an ac ground is called an
a) coupling
capacitor
| 12.] The depletion-mode
MOSFET |
d)
can operate with positive as well as negative gate voltages
13.] What
causes the piezoelectric effect?
b)
pressure on a crystal
|
| 14.] A TRIAC: |
d)
can be triggered by either a positive or a negative gate voltage
15.] When
does maximum power transfer happen from the source to the load?
d) When the source resistance equals the load resistance
| 16.] Which resistive
component is designed to be temperature sensitive? |
a) Thermistor
17.] How many
valence shell electrons are there in semiconductor atoms?
c)
4
18.] When
transistors are used in digital circuits they usually operate in the:
c)
saturation and cutoff regions
19.] A
current ratio of IC/IE is usually less than one and is
called:
c)
alpha
20.]
A Wheatstone bridge can be used to determine an unknown
a) Resistance
21.] Minority
carriers are many times activated by:
a) heat
22.] The DIAC
is a:
d)
bidirectional
device
23.] A
transducer's function is to:
b)
convert energy
24.] What
device is similar to an RTD but has a negative temperature coefficient?
b)
Thermistor
25.] The
silicon-controlled rectifier can be turned off?
b)
by forced
commutation
26.] The
change in value of an analog signal during the conversion process produces what
is called the
a)
quantization
error
27.] The
output voltage of a typical thermocouple is
a)
less than 100
mV
|
|
28.] Holding
current for an SCR is best described as
c)
the amount of
current required to maintain conduction
|
|
29.] What is
the moving part of a linear variable differential transformer?
d) Core
30.] Power
stored from the source and then returned to the source is called
c) reactive power
31.] Which of
the following memories uses a MOSFET and a capacitor as its memory cell?
b) DRAM
32.] How many
storage locations are available when a memory device has twelve address lines?
d) 4096
33.] A
nonvolatile type of memory that can be programmed and erased in sectors, rather
than one byte at a time is:
a)
flash memory
34.] When
referring to instruction words, a mnemonic is:
b) a
short abbreviation for the operation to be performed
35.] The
software used to drive microprocessor-based systems is called:
a)
assembly
language programs
36.] The
number of bits used to store a BCD digit is:
b) 4
37.] The
weight of the LSB as a binary number is:
a) 1
38.] The dc
current through each diode in a bridge rectifier equals:
a) the
load current
39.] With a
half-wave rectified voltage across the load resistor, load current flows for
what part of a cycle?
c) 180 degrees
40.] How many
NAND circuits are contained in a 7400 NAND IC?
c) 4
41.]
Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?
d) AND gates, OR gates, and NOT
gates
42.] An RL
integrator and an RC differentiator can act as what types of filters,
respectively?
b)
low-pass, high-pass
43.] The unit
of flux density is known as
d) a
tesla
44.] Which
two values are plotted on a B-H curve graph?
d) Flux density and magnetizing
force
45.] What
theorem replaces a complex network with an equivalent circuit containing a
source voltage and a series resistance?
c) Thevenin
46.] What is
a varistor?
a) a
voltage-dependent resistor
47.] When a
parallel circuit resonates it is said to:
c) both of the above
48.] When
checking a good SCR or TRIAC with an ohmmeter it will:
a) show
high resistance in both directions
49.]
Increasing the number of turns of wire on the secondary of a transformer will
b) decrease
the secondary current
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