ME1 & ME2_ ELEX

100問 • 1年前

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問題一覧

If a resistance to which a constant voltage is applied is halved, what power dissipation will result?

Doubled

If the reference point is changed to the earth point then any voltage taken w.r.t. the earth is known as

Absolute potential

Two ac sources feed a common variable resistive load as shown in figure. Under the maximum power transfer condition, what is the power absorbed by the load resistance RL?

625 W

In a parallel circuit, the individual branch currents are

inversely proportional to the branch resistance values

When a material becomes a superconductor, its resistivity becomes

zero

Delta to wye or wye to delta transformation technique is applied to a ______ network.

three-terminal

A straight conductor 500 mm long is moved with constant velocity at right angles both to its length and to a uniform magnetic field. Given that the e.m.f. induced in the conductor is 2.5 V and the velocity is 5 m/s, calculate the flux density of the magnetic field. If the conductor forms part of a closed circuit of total resistance 5 ohms, calculate the force on the conductor.

0.25N

A current of 6 A flows for 10 minutes. What charge is transferred?

3600 C

The magnetic field due to a current-carrying conductor takes form of:

concentric circles

Voltage drop is the:

difference in potential between 2 points

The effect on an air gap in a magnetic circuit is to:

increase the reluctance

A strong permanent magnet is plunged into a coil and left in the coil. What is the effect produced on the coil after a short time?

There is no effect

An RLC series circuit is underdamped. To make it overdamped, the value of R

has to be increased

The drift velocity of electrons is

very small as compared to speed of light

Calculate the resistivity of ntype semiconductor from the following data, Density of holes = 5 x 1012 cm-3. Density of electrons = 8 x 1013 cm-3, mobility of conduction electron = 2.3 x 104 cm2/ V-sec and mobility of holes = 100 cm2/V-sec

0.34 Ω-m

Assertion (A): Two transistors one n-p-n and the other p-n-p are identical in all respects (doping, construction, shape, size). The np-n transistor will have better frequency response. Reason (R): The electron mobility is higher than hole mobility.

Both A and R are true and R is correct explanation of A

From the given circuit below, we can conclude that.

transistor is faulty

In an ideal op-amp, which is not true?

CMRR is zero

What is the use of the compensation capacitor in op-amp?

Decreases the slew rate of op-amp

In a low pass filter as below, find the cut-off frequency for the following circuit.

636 Hz

Ripple factor of bridge full wave rectifier is _________.

0.482

If peak voltage on a bridge full wave rectifier circuit is 5V and diode cut-in voltage is 0.7, then peak inverse voltage on diode will be _________.

4.3V

For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100

1 mA

Which of the following oscillators is suitable for frequencies in the range of megahertz?

Hartley

Figure is a 24 Vr stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current are

320 Ω, 15 mA

In a class C power amplifier the input signal has a frequency of 250kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is

2.5%

In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 kΩ, current through RE is

0.93 mA

The main advantage of CMOS circuit is

low power consumption

Assertion (A): In design of circuit using BJT, a derating factor is used. Reason (R): As the ambient temperature increases, heat dissipation becomes slower.

Both A and R are true and R is correct explanation of A

As temperature increases the number of free electrons and holes in an intrinsic semiconductor

increases

A conductor is said to have resistance of one ohm if a potential difference of one volt across its terminals causes a current of X ampere to flow through it. What will be the value of X?

A 25 Ω resistor has a voltage of 150 sin377 t. Find the corresponding power.

900 sin² 337 t

According to Kirchhoff’s voltage law, the algebraic sum of all IR drops and e.m.f. in any closed loop of a network is always.

Zero

The concept on which Superposition theorem is based is.

Linearity

If the load in the given circuit is 120 k-ohms, what is the loaded output voltage?

15.79 V

With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?

400 mA

What is the total resistance of a circuit when R1 (7 k ) is in series with a parallel combination of R2 (20 k ), R3 (36 k ), and R4 (45 k )?

17 k-ohms

What is the total resistance?

3.2 k

If doubling the voltage across a resistor doubles the current through the resistor then

the resistor value did not change

What is the power in the given circuit?

35 W

If voltage across a resistance doubles.

none of the above

Intrinsic semiconductor material is characterized by a valence shell of how many electrons?

What causes the depletion region?

diffusion

What can a semiconductor sense?

all of the above

The primary function of the bias circuit is to

hold the circuit stable at the designed Q-point

A JFET is a ______.

is a voltage-controlled device

D-MOSFETs are sometimes used in series to construct a cascode highfrequency amplifier to overcome the loss of:

high input impedance

When an input signal reduces the channel size, the process is called:

depletion

Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be.

30 μC and 60 μC respectively

If the diameter of a wire is doubled, the current carrying capacity of the wire becomes

four times

What device from the thyristor family has its gate terminal connected to the n-type material near the anode? Select one:

PUT

Which of the following bits are used for setting the data frame size?

UCSZ0

Ladder logic programming consists primarily of:

Virtual relay contacts and coils

Which of the following buses are present in a microcontroller for transferring data from one place to another?

Address bus, data bus, control bus

In a bit-mapped I/O system each:

Byte is assigned an I/O address.

If the gain of the system is reduced to a zero value, the roots of the system in the s-plane:

Coincide with the poles

For either an RC low-pass or high pass filter,

Xc = R at the cutoff frequency.

The systematic reduction of logic circuits is accomplished by:

using Boolean algebra

The commutative law of addition and multiplication indicates that:

the way we OR or AND two variables is unimportant because the result is the same

What are the three terminals of a TRIAC?

Gate, anode 1, and anode 2.

The Static Induction Thyristor (SITH) is a:

3 terminal, self-controlled device

Which one of the following are correct? The root locus is the path of the roots of the characteristic equation traced out in the s-plane:

As a system parameter is changed.

The following switching functions are to be implemented using a decoder: f1 = m(1, 2, 4, 8, 10, 14) f2 = m(2, 5, 9, 11) f3 = m(2, 4, 5, 6, 7). The minimum configuration of decoder will be:

4 to 16 lines

Which of the following is not the feature of a modern control system?

No oscillation

How many R-S flip-flops would be required to construct an 8-bit storage register?

What is the name of the random-accessed semiconductor memory IC that must be refreshed periodically to maintain reliable data storage in its memory matrix?

DRAM - Dynamic Random-Access Memory.

With surface-mount technology (SMT), the devices should:

mount directly

What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts?

Zero to 0.8 volts.

The Static Induction Thyristor (SITH) has:

gate, anode, cathode

What is the difference between a 7400 and a 7411 IC?

7400 has four two-input NAND gates; 7411 has three three-input AND gates

When the microcontroller executes some arithmetic operations, then the lag bits of which of the following register are affected?

PSW

Which hardware triggers some operation after certain programmed count?

programmable interval timer

What will happen in that condition, if an interrupt occurs while the microcontroller is serving any other interrupt?

The interrupt that is more priority in the interrupt vector table will be served first.

Which among the following is not an advantage of an open loop system?

Requirement of system recalibration from time to time

Consider the loop transfer function K(s+6)/(s+3)(s+5), in the root locus diagram the centroid will be located at:

-2

In AVR, which of the following registers are there for the I/O programming of ports?

All of the mentioned

In the thyristor gating circuit, the supply to the pulse amplifier is provided by the:

isolation transformer

TTL inputs left open develop what logic state?

A high-logic state.

A differential amplifier has an open-loop voltage gain of 120. The input signals are 2.45 V and 2.35 V. Calculate the output voltage of the Amplifier.

12.0 V

What will be the output from a D flip – flop if the clock is low and D = 0?

No change

A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current, if the triggering angle is 30 degrees, what will be the input power factor?

0.65

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

Ex-OR gate

The thyristor turn-off requires that the anode current:

falls below the latching current

Which of the following should a microcontroller at-least should consist of?

CPU, RAM, I/O ports, and timers

If the RC firing circuit used for firing an SCR is to be used to fire a TRIAC then:

the diode should be replaced by a diac

In a negative-logic circuit, what level is used to represent a logic 0?

High level.

In case of a cosine firing scheme, __________ is used to get a cosine wave

an integrator circuit

HEMT based __________ have a spot-size convertor with a photodiode.

p-i-n photoreceiver

The Silicon Controlled Switch (SCS) can be turned on by two methods, by applying __________ and __________.

negative pulse to the anode gate, positive pulse to the cathode gate

The Static Induction Thyristor (SITH) is a:

p+ n+ diode with p+ electrodes

The natural reversal of ac supply voltage commutates the SCR in case of:

both line and natural commutation

If the poles or zeros are repeated, then the function is said to be having _________ poles or ________ zeros.

multiple, multiple

A commutator is a device fitted to a generator. Its function is:

To generate a direct current

Which network provides the greatest harmonic suppression?

Pi-L network

Which characteristic of IC in Digital Circuits represents a function of the switching time of a particular transistor?

Propagation delay

From the following list of devices, choose the device that only turns-on or a fixed-value of anode-cathode voltage

SUS

What converts the programs written in assembly language into machine instructions?

Assembler

The APT (automatically programmed tools) language is used with:

Numerical controlled machines

Which of the following bit/s of the status register that allows the microcontroller to operate in its low power mode?

CPU off

100

The Reverse Conducting Thyristor (RCT) has:

a diode in anti-parallel with the SCR

elex1

elex1

elex2

elex2

ME1_Math

ME1_Math

Math2

Math2

ME1 & ME2_MATH

Loloysan · 100問 · 1年前

ME1 & ME2_MATH

rc2_elex

rc2_elex

rc3_elex

rc3_elex

geasME1

geasME1

geasME2

geasME2

GEAS_ME1 & ME2

Loloysan · 100問 · 1年前

GEAS_ME1 & ME2

est_ME1

est_ME1

est_ME2

est_ME2

est_ME1 & ME2

Loloysan · 100問 · 1年前

est_ME1 & ME2

100問 • 1年前

Loloysan

問題一覧

If a resistance to which a constant voltage is applied is halved, what power dissipation will result?

Doubled

If the reference point is changed to the earth point then any voltage taken w.r.t. the earth is known as

Absolute potential

Two ac sources feed a common variable resistive load as shown in figure. Under the maximum power transfer condition, what is the power absorbed by the load resistance RL?

625 W

In a parallel circuit, the individual branch currents are

inversely proportional to the branch resistance values

When a material becomes a superconductor, its resistivity becomes

zero

Delta to wye or wye to delta transformation technique is applied to a ______ network.

three-terminal

0.25N

A current of 6 A flows for 10 minutes. What charge is transferred?

3600 C

The magnetic field due to a current-carrying conductor takes form of:

concentric circles

Voltage drop is the:

difference in potential between 2 points

The effect on an air gap in a magnetic circuit is to:

increase the reluctance

A strong permanent magnet is plunged into a coil and left in the coil. What is the effect produced on the coil after a short time?

There is no effect

An RLC series circuit is underdamped. To make it overdamped, the value of R

has to be increased

The drift velocity of electrons is

very small as compared to speed of light

0.34 Ω-m

Both A and R are true and R is correct explanation of A

From the given circuit below, we can conclude that.

transistor is faulty

In an ideal op-amp, which is not true?

CMRR is zero

What is the use of the compensation capacitor in op-amp?

Decreases the slew rate of op-amp

In a low pass filter as below, find the cut-off frequency for the following circuit.

636 Hz

Ripple factor of bridge full wave rectifier is _________.

0.482

If peak voltage on a bridge full wave rectifier circuit is 5V and diode cut-in voltage is 0.7, then peak inverse voltage on diode will be _________.

4.3V

For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100

1 mA

Which of the following oscillators is suitable for frequencies in the range of megahertz?

Hartley

Figure is a 24 Vr stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current are

320 Ω, 15 mA

In a class C power amplifier the input signal has a frequency of 250kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is

2.5%

In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 kΩ, current through RE is

0.93 mA

The main advantage of CMOS circuit is

low power consumption

Assertion (A): In design of circuit using BJT, a derating factor is used. Reason (R): As the ambient temperature increases, heat dissipation becomes slower.

Both A and R are true and R is correct explanation of A

As temperature increases the number of free electrons and holes in an intrinsic semiconductor

increases

A conductor is said to have resistance of one ohm if a potential difference of one volt across its terminals causes a current of X ampere to flow through it. What will be the value of X?

A 25 Ω resistor has a voltage of 150 sin377 t. Find the corresponding power.

900 sin² 337 t

According to Kirchhoff’s voltage law, the algebraic sum of all IR drops and e.m.f. in any closed loop of a network is always.

Zero

The concept on which Superposition theorem is based is.

Linearity

If the load in the given circuit is 120 k-ohms, what is the loaded output voltage?

15.79 V

With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?

400 mA

What is the total resistance of a circuit when R1 (7 k ) is in series with a parallel combination of R2 (20 k ), R3 (36 k ), and R4 (45 k )?

17 k-ohms

What is the total resistance?

3.2 k

If doubling the voltage across a resistor doubles the current through the resistor then

the resistor value did not change

What is the power in the given circuit?

35 W

If voltage across a resistance doubles.

none of the above

Intrinsic semiconductor material is characterized by a valence shell of how many electrons?

What causes the depletion region?

diffusion

What can a semiconductor sense?

all of the above

The primary function of the bias circuit is to

hold the circuit stable at the designed Q-point

A JFET is a ______.

is a voltage-controlled device

D-MOSFETs are sometimes used in series to construct a cascode highfrequency amplifier to overcome the loss of:

high input impedance

When an input signal reduces the channel size, the process is called:

depletion

Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be.

30 μC and 60 μC respectively

If the diameter of a wire is doubled, the current carrying capacity of the wire becomes

four times

What device from the thyristor family has its gate terminal connected to the n-type material near the anode? Select one:

PUT

Which of the following bits are used for setting the data frame size?

UCSZ0

Ladder logic programming consists primarily of:

Virtual relay contacts and coils

Which of the following buses are present in a microcontroller for transferring data from one place to another?

Address bus, data bus, control bus

In a bit-mapped I/O system each:

Byte is assigned an I/O address.

If the gain of the system is reduced to a zero value, the roots of the system in the s-plane:

Coincide with the poles

For either an RC low-pass or high pass filter,

Xc = R at the cutoff frequency.

The systematic reduction of logic circuits is accomplished by:

using Boolean algebra

The commutative law of addition and multiplication indicates that:

the way we OR or AND two variables is unimportant because the result is the same

What are the three terminals of a TRIAC?

Gate, anode 1, and anode 2.

The Static Induction Thyristor (SITH) is a:

3 terminal, self-controlled device

Which one of the following are correct? The root locus is the path of the roots of the characteristic equation traced out in the s-plane:

As a system parameter is changed.

The following switching functions are to be implemented using a decoder: f1 = m(1, 2, 4, 8, 10, 14) f2 = m(2, 5, 9, 11) f3 = m(2, 4, 5, 6, 7). The minimum configuration of decoder will be:

4 to 16 lines

Which of the following is not the feature of a modern control system?

No oscillation

How many R-S flip-flops would be required to construct an 8-bit storage register?

What is the name of the random-accessed semiconductor memory IC that must be refreshed periodically to maintain reliable data storage in its memory matrix?

DRAM - Dynamic Random-Access Memory.

With surface-mount technology (SMT), the devices should:

mount directly

What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts?

Zero to 0.8 volts.

The Static Induction Thyristor (SITH) has:

gate, anode, cathode

What is the difference between a 7400 and a 7411 IC?

7400 has four two-input NAND gates; 7411 has three three-input AND gates

When the microcontroller executes some arithmetic operations, then the lag bits of which of the following register are affected?

PSW

Which hardware triggers some operation after certain programmed count?

programmable interval timer

What will happen in that condition, if an interrupt occurs while the microcontroller is serving any other interrupt?

The interrupt that is more priority in the interrupt vector table will be served first.

Which among the following is not an advantage of an open loop system?

Requirement of system recalibration from time to time

Consider the loop transfer function K(s+6)/(s+3)(s+5), in the root locus diagram the centroid will be located at:

-2

In AVR, which of the following registers are there for the I/O programming of ports?

All of the mentioned

In the thyristor gating circuit, the supply to the pulse amplifier is provided by the:

isolation transformer

TTL inputs left open develop what logic state?

A high-logic state.

A differential amplifier has an open-loop voltage gain of 120. The input signals are 2.45 V and 2.35 V. Calculate the output voltage of the Amplifier.

12.0 V

What will be the output from a D flip – flop if the clock is low and D = 0?

No change

A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current, if the triggering angle is 30 degrees, what will be the input power factor?

0.65

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

Ex-OR gate

The thyristor turn-off requires that the anode current:

falls below the latching current

Which of the following should a microcontroller at-least should consist of?

CPU, RAM, I/O ports, and timers

If the RC firing circuit used for firing an SCR is to be used to fire a TRIAC then:

the diode should be replaced by a diac

In a negative-logic circuit, what level is used to represent a logic 0?

High level.

In case of a cosine firing scheme, __________ is used to get a cosine wave

an integrator circuit

HEMT based __________ have a spot-size convertor with a photodiode.

p-i-n photoreceiver

The Silicon Controlled Switch (SCS) can be turned on by two methods, by applying __________ and __________.

negative pulse to the anode gate, positive pulse to the cathode gate

The Static Induction Thyristor (SITH) is a:

p+ n+ diode with p+ electrodes

The natural reversal of ac supply voltage commutates the SCR in case of:

both line and natural commutation

If the poles or zeros are repeated, then the function is said to be having _________ poles or ________ zeros.

multiple, multiple

A commutator is a device fitted to a generator. Its function is:

To generate a direct current

Which network provides the greatest harmonic suppression?

Pi-L network

Which characteristic of IC in Digital Circuits represents a function of the switching time of a particular transistor?

Propagation delay

From the following list of devices, choose the device that only turns-on or a fixed-value of anode-cathode voltage

SUS

What converts the programs written in assembly language into machine instructions?

Assembler

The APT (automatically programmed tools) language is used with:

Numerical controlled machines

Which of the following bit/s of the status register that allows the microcontroller to operate in its low power mode?

CPU off

100

The Reverse Conducting Thyristor (RCT) has:

a diode in anti-parallel with the SCR