Q. In a combinational circuit, what is the primary function of multiplexers?
A.
To perform arithmetic operations
B.
To select one of many inputs
C.
To store data
D.
To invert signals
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Solution
Multiplexers are used to select one of many input signals and forward the selected input to a single output line.
Correct Answer:
B
— To select one of many inputs
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Q. In a combinational logic circuit, what is the primary function of multiplexers?
A.
To perform arithmetic operations
B.
To select one of many inputs
C.
To store data
D.
To invert signals
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Solution
Multiplexers are used to select one of many input signals and forward the selected input to a single output line.
Correct Answer:
B
— To select one of many inputs
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Q. In a common emitter BJT configuration, what is the phase relationship between the input and output signals?
A.
In phase
B.
Out of phase
C.
No phase relationship
D.
Dependent on frequency
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Solution
In a common emitter configuration, the output signal is inverted, meaning it is out of phase with the input.
Correct Answer:
B
— Out of phase
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Q. In a common-emitter BJT configuration, what is the phase relationship between input and output?
A.
In phase
B.
Out of phase
C.
No phase relationship
D.
Dependent on frequency
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Solution
In a common-emitter configuration, the output is 180 degrees out of phase with the input.
Correct Answer:
B
— Out of phase
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Q. In a common-source FET amplifier configuration, what is the phase relationship between the input and output signals?
A.
In phase
B.
Out of phase
C.
No phase relationship
D.
Dependent on frequency
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Solution
In a common-source configuration, the output signal is inverted, meaning it is out of phase with the input signal.
Correct Answer:
B
— Out of phase
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Q. In a comparator circuit, what happens when the non-inverting input voltage exceeds the inverting input voltage?
A.
The output goes low
B.
The output goes high
C.
The output remains unchanged
D.
The output oscillates
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Solution
When the non-inverting input voltage exceeds the inverting input voltage, the output of the comparator goes high.
Correct Answer:
B
— The output goes high
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Q. In a database, what does a 'foreign key' do?
A.
Links two tables together
B.
Identifies a unique record
C.
Stores large amounts of data
D.
Indexes a table for faster access
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Solution
A foreign key links two tables together by referencing the primary key of another table.
Correct Answer:
A
— Links two tables together
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Q. In a database, what does ACID stand for?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Concurrency, Integrity, Durability
C.
Atomicity, Consistency, Isolation, Data integrity
D.
Atomicity, Consistency, Isolation, Distribution
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Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the key properties of transactions in a database.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. In a DBMS architecture, what does the term 'data independence' refer to?
A.
The ability to change the data structure without affecting the application
B.
The ability to access data from multiple sources
C.
The ability to store data in different formats
D.
The ability to secure data from unauthorized access
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Solution
Data independence refers to the ability to change the data structure without affecting the applications that use the data.
Correct Answer:
A
— The ability to change the data structure without affecting the application
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Q. In a differential amplifier configuration, what does the operational amplifier amplify?
A.
The average of the input signals
B.
The difference between the input signals
C.
The sum of the input signals
D.
The square of the input signals
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Solution
A differential amplifier configuration amplifies the difference between the input signals.
Correct Answer:
B
— The difference between the input signals
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Q. In a differential amplifier configuration, what is the output voltage proportional to?
A.
The difference between two input voltages
B.
The sum of two input voltages
C.
The average of two input voltages
D.
The product of two input voltages
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Solution
In a differential amplifier configuration, the output voltage is proportional to the difference between two input voltages.
Correct Answer:
A
— The difference between two input voltages
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Q. In a differential amplifier, what is the significance of the resistor values?
A.
They determine the input impedance
B.
They set the common-mode gain
C.
They affect the differential gain
D.
They stabilize the output voltage
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Solution
In a differential amplifier, the resistor values directly affect the differential gain, which is the ratio of the output voltage to the difference between the input voltages.
Correct Answer:
C
— They affect the differential gain
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Q. In a discrete-time signal, what does the term 'aliasing' refer to?
A.
Loss of signal strength
B.
Distortion of the signal due to insufficient sampling
C.
The process of filtering a signal
D.
The conversion of a signal from analog to digital
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Solution
Aliasing occurs when a signal is sampled at a rate lower than twice its highest frequency, causing different signals to become indistinguishable.
Correct Answer:
B
— Distortion of the signal due to insufficient sampling
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Q. In a distributed database, what is the purpose of data replication?
A.
To ensure data consistency across all nodes
B.
To reduce the size of the database
C.
To increase the complexity of the system
D.
To eliminate the need for backups
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Solution
Data replication in a distributed database ensures data consistency across all nodes by maintaining copies of the same data in multiple locations.
Correct Answer:
A
— To ensure data consistency across all nodes
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Q. In a FET, what does the gate voltage control?
A.
The drain current
B.
The source voltage
C.
The gate current
D.
The output power
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Solution
In a FET, the gate voltage controls the drain current, allowing for modulation of the current flow.
Correct Answer:
A
— The drain current
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Q. In a first-order RC circuit, what happens to the voltage across the capacitor after 5 time constants?
A.
It is at 100% of V0
B.
It is at 63.2% of V0
C.
It is at 86.5% of V0
D.
It is at 50% of V0
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Solution
After 5 time constants, the voltage across the capacitor in a first-order RC circuit is effectively at 100% of the supply voltage V0.
Correct Answer:
A
— It is at 100% of V0
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Q. In a full adder, how many inputs does it have?
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Solution
A full adder has three inputs: two significant bits and one carry-in bit.
Correct Answer:
C
— 3
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Q. In a half adder, what does the sum output represent?
A.
Carry out
B.
Logical AND
C.
Logical OR
D.
XOR of inputs
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Solution
The sum output of a half adder represents the XOR of the two input bits.
Correct Answer:
D
— XOR of inputs
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Q. In a half-wave rectifier, what happens to the negative half of the AC signal?
A.
It is amplified
B.
It is blocked
C.
It is inverted
D.
It is passed through
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Solution
In a half-wave rectifier, the negative half of the AC signal is blocked by the diode.
Correct Answer:
B
— It is blocked
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Q. In a JFET, what is the effect of increasing the gate-source voltage (Vgs)?
A.
Increases the drain current
B.
Decreases the drain current
C.
Has no effect on the drain current
D.
Increases the gate current
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Solution
Increasing the gate-source voltage (Vgs) in a JFET decreases the drain current due to the depletion region widening.
Correct Answer:
B
— Decreases the drain current
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Q. In a monostable 555 timer circuit, what happens when the trigger pin is activated?
A.
The output goes high for a short duration
B.
The output remains low
C.
The output oscillates
D.
The timer resets
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Solution
When the trigger pin is activated, the output of a monostable 555 timer goes high for a short duration.
Correct Answer:
A
— The output goes high for a short duration
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Q. In a monostable 555 timer, what determines the duration of the output pulse?
A.
The supply voltage
B.
The value of the timing resistor and capacitor
C.
The trigger signal duration
D.
The output load
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Solution
The duration of the output pulse in a monostable 555 timer is determined by the values of the timing resistor and capacitor.
Correct Answer:
B
— The value of the timing resistor and capacitor
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Q. In a MOSFET, what does the term 'threshold voltage' refer to?
A.
The maximum voltage the device can handle
B.
The voltage at which the device turns off
C.
The minimum gate voltage required to create a conducting channel
D.
The voltage drop across the drain-source terminals
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Solution
The threshold voltage is the minimum gate voltage required to create a conducting channel in a MOSFET.
Correct Answer:
C
— The minimum gate voltage required to create a conducting channel
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Q. In a multiplexer, what is the role of the select lines?
A.
To determine the output based on input values
B.
To store data
C.
To provide power
D.
To control timing
Show solution
Solution
Select lines in a multiplexer determine which input line is connected to the output.
Correct Answer:
A
— To determine the output based on input values
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Q. In a multiuser database environment, what is a deadlock?
A.
A situation where two transactions are waiting for each other to release locks
B.
A method of data encryption
C.
A type of database backup
D.
A way to optimize queries
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Solution
A deadlock occurs when two transactions are waiting for each other to release locks, preventing both from proceeding.
Correct Answer:
A
— A situation where two transactions are waiting for each other to release locks
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Q. In a multiuser database environment, what is a potential problem that can arise?
A.
Data redundancy
B.
Data inconsistency
C.
Data isolation
D.
Data normalization
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Solution
Data inconsistency can arise in a multiuser database environment when multiple users update the same data simultaneously.
Correct Answer:
B
— Data inconsistency
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Q. In a multiuser database environment, what is the role of a DBMS?
A.
To manage user interfaces
B.
To provide data storage and retrieval services
C.
To perform data analysis
D.
To create reports
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Solution
The primary role of a DBMS in a multiuser environment is to manage data storage and retrieval services efficiently.
Correct Answer:
B
— To provide data storage and retrieval services
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Q. In a non-inverting op-amp configuration, what is the relationship between the input and output voltages?
A.
Vout = Vin
B.
Vout = Vin + Vref
C.
Vout = Vin * (1 + Rf/Rin)
D.
Vout = Vin / (1 + Rf/Rin)
Show solution
Solution
In a non-inverting op-amp configuration, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
C
— Vout = Vin * (1 + Rf/Rin)
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Q. In a non-inverting op-amp configuration, what is the relationship between the input and output voltage?
A.
Vout = Vin
B.
Vout = Vin + Vref
C.
Vout = Vin * (1 + Rf/Rin)
D.
Vout = Vin / (1 + Rf/Rin)
Show solution
Solution
In a non-inverting configuration, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
C
— Vout = Vin * (1 + Rf/Rin)
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Q. In a parallel circuit with a diode, if the diode is forward-biased, it will:
A.
Block current
B.
Allow current to flow
C.
Short-circuit the circuit
D.
Increase the total resistance
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Solution
A forward-biased diode allows current to flow through it, affecting the overall current in the parallel circuit.
Correct Answer:
B
— Allow current to flow
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