1728 + Mcqs in Electronics Page 9 McqOptions

401.	In a series parallel circuit, individual component power dissipations are calculated using:
A.	individual component parameters
B.	a percent of the voltage division ratio squared
C.	total current squared multiplied by the resistor values
D.	a percent of the total power depending on resistor ratios
Answer» B. a percent of the voltage division ratio squared

Discussion

402.	The current flowing through an unloaded voltage divider is called the:
A.	resistor current
B.	load current
C.	bleeder current
D.	voltage current
Answer» D. voltage current

Discussion

403.	The number of bits in a digital word determines the number of digital combinations that will be represented. The number of combinations can be calculated by ________.
A.	raising 2 to the number of bits in the analog word
B.	raising 2 to the number of bits in the digital word
C.	multiplying 2 by the number of bits in the analog word
D.	determining the range of the analog word
Answer» C. multiplying 2 by the number of bits in the analog word

Discussion

404.	A(n) _____ can be rapidly switched on and off remotely by another controlling circuit.
A.	triac
B.	diac
C.	RTD
D.	zero-voltage switch
Answer» B. diac

Discussion

405.	A sample-and-hold circuit consists of _________.
A.	an op-amp, an analog switch, and an inductor
B.	an op-amp, an analog switch, and a capacitor
C.	two op-amps, an analog switch, and a variable resistor
D.	two op-amps, an analog switch, and a capacitor
Answer» E.

Discussion

406.	RTDs, strain gauges, and pressure transducers are _____ devices.
A.	resistive
B.	inductive
C.	capacitive
D.	solid-state
Answer» B. inductive

Discussion

407.	A resistance temperature detector produces a voltage for a given change in temperature.
A.	True
B.	False
Answer» C.

Discussion

408.	The triac provides better dc power control than the SCR.
A.	True
B.	False
Answer» C.

Discussion

409.	The SCR is ideal for ac applications.
A.	True
B.	False
Answer» C.

Discussion

410.	Displacement, velocity, and acceleration can all be measured by using specific motion transducers.
A.	True
B.	False
Answer» B. False

Discussion

411.	A strain gauge uses the principle of capacitance for its operation.
A.	True
B.	False
Answer» C.

Discussion

412.	The TRIAC is equivalent to ________________.
A.	a four-layer diode
B.	two DIACs in parallel
C.	a thyristor with a gate lead
D.	two SCRs in parallel
Answer» E.

Discussion

413.	An optically coupled isolator is a device containing _________ in a single package.
A.	a photodiode and an optotransmitter
B.	an LED and an SCR
C.	an anode and a cathode
D.	an IRED and a silicon phototransistor
Answer» E.

Discussion

414.	The optically coupled isolator interrupter module is used to transfer switching information between two electrically isolated points.
A.	True
B.	False
Answer» C.

Discussion

415.	A photodiode is a device that produces light.
A.	True
B.	False
Answer» C.

Discussion

416.	To turn an SCR off, simply remove the gate voltage.
A.	True
B.	False
Answer» C.

Discussion

417.	A thermistor is a semiconductor device that acts like a piezoresistive resistor.
A.	True
B.	False
Answer» C.

Discussion

418.	A silicon-controlled rectifier (SCR) has 3 terminals labeled base, collector, and emitter.
A.	True
B.	False
Answer» C.

Discussion

419.	The output voltage in the given circuit is _____ at the end of the second pulse.
A.	1.06 V
B.	7.56 V
C.	3.32 V
D.	12 V
Answer» D. 12 V

Discussion

420.	For a capacitor to completely charge in an RC integrator, the pulse width must be _____ 5 time constants.
A.	less than
B.	greater than
C.	equal to
D.	greater than or equal to
Answer» E.

Discussion

421.	The voltage across a capacitor in an RC integrator circuit cannot change exponentially; it can change only instantaneously.
A.	True
B.	False
Answer» C.

Discussion

422.	The output voltage of a differentiator goes negative on the falling edge of the input pulse.
A.	True
B.	False
Answer» B. False

Discussion

423.	If a repetitive-pulse waveform is applied to an RC integrator, the output waveshape depends on the relationship of the circuit time constant and the duty cycle of the input pulses.
A.	True
B.	False
Answer» C.

Discussion

424.	If the pulse source has an internal resistance of 80 in the given circuit, it will take ______ for the output voltage to decrease to zero.
A.	1 ms
B.	1.1 ms
C.	1.2 ms
D.	2.5 ms
Answer» C. 1.2 ms

Discussion

425.	Generally, increasing the resistance in a circuit will decrease the current.
A.	True
B.	False
Answer» B. False

Discussion

426.	The power is ___ if 200 J of energy are used in 10 s.
A.	2 W
B.	5 W
C.	20 W
D.	50 W
Answer» D. 50 W

Discussion

427.	Resistance and current are _________.
A.	directly proportional
B.	inversely proportional
C.	not related
D.	similar to voltage
Answer» C. not related

Discussion

428.	If the output of an RC integrator is zero volts, the capacitor might be open.
A.	True
B.	False
Answer» C.

Discussion

429.	During the steady-state condition of a differentiator, the average output voltage is zero volts.
A.	True
B.	False
Answer» B. False

Discussion

430.	The voltage across the capacitor in the given circuit is _______ at the beginning of the second pulse. Assume the capacitor is initially uncharged.
A.	0 V
B.	427.74 mV
C.	2.8 V
D.	7.56 V
Answer» C. 2.8 V

Discussion

431.	If the pulse width were cut in half in the given circuit, the voltage across the resistor would be ______ at the end of the pulse.
A.	0 V
B.	0.36 V
C.	0.46 V
D.	0.9 V
Answer» D. 0.9 V

Discussion

432.	The efficiency rating of a power supply is determined by internal power loss.
A.	True
B.	False
Answer» B. False

Discussion

433.	The value of a resistor is in direct proportion to its power handling capabilities.
A.	True
B.	False
Answer» C.

Discussion

434.	Heat produced by a resistor is generally a desirable effect.
A.	True
B.	False
Answer» C.

Discussion

435.	Power is a measure of how fast current is flowing.
A.	True
B.	False
Answer» C.

Discussion

436.	___ is a better way of expressing 7,500,000 W.
A.	7.5 kW
B.	7,500 MW
C.	7,500 GW
D.	7.5 MW
Answer» E.

Discussion

437.	The current is ___ if the voltage across a 5 k resistor is 25 V.
A.	200 mA
B.	125 mA
C.	75 mA
D.	5 mA
Answer» E.

Discussion

438.	The ___ rating of a resistor will increase with an increase in the surface area of the resistor.
A.	resistance
B.	current
C.	power
D.	voltage
Answer» D. voltage

Discussion

439.	The number of joules used in 1 second is always equal to the number of _______.
A.	siemens
B.	coulombs
C.	amperes
D.	watts
Answer» E.

Discussion

440.	The _____ is the time it takes for a capacitor to fully charge or discharge.
A.	transient time
B.	pulse response
C.	time constant
D.	steady state
Answer» B. pulse response

Discussion

441.	The unit of magnetic flux is the weber.
A.	True
B.	False
Answer» B. False

Discussion

442.	A voltage is induced across a conductor if it remains absolutely stationary within a magnetic field.
A.	True
B.	False
Answer» C.

Discussion

443.	When the south poles of two bar magnets are brought close together, there will be a force of attraction.
A.	True
B.	False
Answer» C.

Discussion

444.	A magnetic field is produced around a current-carrying conductor.
A.	True
B.	False
Answer» B. False

Discussion

445.	___ is the ability of a material to remain magnetized after removal of the magnetizing force.
A.	Reluctance
B.	Hysteresis
C.	Retentivity
D.	Induction
Answer» D. Induction

Discussion

446.	Ferromagnetic materials have minute magnetic ___ created within their atomic structure by the orbital motion and spin of electrons.
A.	forces
B.	flux lines
C.	domains
D.	tapes
Answer» D. tapes

Discussion

447.	The ___ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.
A.	permanent-magnet speaker
B.	d'Arsonval movement
C.	single-pole, double-throw relay
D.	crankshaft position sensor
Answer» C. single-pole, double-throw relay

Discussion

448.	The induced emf of a conductor cutting flux lines is directly proportional to the rate of cutting.
A.	True
B.	False
Answer» B. False

Discussion

449.	The magnetic field, current through the Hall element, and Hall voltage are all at right angles to each other.
A.	True
B.	False
Answer» B. False

Discussion

450.	The operation of an electrical generator relies on electromagnetic induction.
A.	True
B.	False
Answer» B. False

Discussion

Explore topic-wise MCQs in Engineering.

In a series parallel circuit, individual component power dissipations are calculated using:

The current flowing through an unloaded voltage divider is called the:

The number of bits in a digital word determines the number of digital combinations that will be represented. The number of combinations can be calculated by ________.

A(n) _____ can be rapidly switched on and off remotely by another controlling circuit.

A sample-and-hold circuit consists of _________.

RTDs, strain gauges, and pressure transducers are _____ devices.

A resistance temperature detector produces a voltage for a given change in temperature.

The triac provides better dc power control than the SCR.

The SCR is ideal for ac applications.

Displacement, velocity, and acceleration can all be measured by using specific motion transducers.

A strain gauge uses the principle of capacitance for its operation.

The TRIAC is equivalent to ________________.

An optically coupled isolator is a device containing _________ in a single package.

The optically coupled isolator interrupter module is used to transfer switching information between two electrically isolated points.

A photodiode is a device that produces light.

To turn an SCR off, simply remove the gate voltage.

A thermistor is a semiconductor device that acts like a piezoresistive resistor.

A silicon-controlled rectifier (SCR) has 3 terminals labeled base, collector, and emitter.

The output voltage in the given circuit is _____ at the end of the second pulse.

For a capacitor to completely charge in an RC integrator, the pulse width must be _____ 5 time constants.

The voltage across a capacitor in an RC integrator circuit cannot change exponentially; it can change only instantaneously.

The output voltage of a differentiator goes negative on the falling edge of the input pulse.

If a repetitive-pulse waveform is applied to an RC integrator, the output waveshape depends on the relationship of the circuit time constant and the duty cycle of the input pulses.

If the pulse source has an internal resistance of 80 in the given circuit, it will take ______ for the output voltage to decrease to zero.

Generally, increasing the resistance in a circuit will decrease the current.

The power is ___ if 200 J of energy are used in 10 s.

Resistance and current are _________.

If the output of an RC integrator is zero volts, the capacitor might be open.

During the steady-state condition of a differentiator, the average output voltage is zero volts.

The voltage across the capacitor in the given circuit is _______ at the beginning of the second pulse. Assume the capacitor is initially uncharged.

If the pulse width were cut in half in the given circuit, the voltage across the resistor would be ______ at the end of the pulse.

The efficiency rating of a power supply is determined by internal power loss.

The value of a resistor is in direct proportion to its power handling capabilities.

Heat produced by a resistor is generally a desirable effect.

Power is a measure of how fast current is flowing.

___ is a better way of expressing 7,500,000 W.

The current is ___ if the voltage across a 5 k resistor is 25 V.

The ___ rating of a resistor will increase with an increase in the surface area of the resistor.

The number of joules used in 1 second is always equal to the number of _______.

The _____ is the time it takes for a capacitor to fully charge or discharge.

The unit of magnetic flux is the weber.

A voltage is induced across a conductor if it remains absolutely stationary within a magnetic field.

When the south poles of two bar magnets are brought close together, there will be a force of attraction.

A magnetic field is produced around a current-carrying conductor.

___ is the ability of a material to remain magnetized after removal of the magnetizing force.

Ferromagnetic materials have minute magnetic ___ created within their atomic structure by the orbital motion and spin of electrons.

The ___ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.

The induced emf of a conductor cutting flux lines is directly proportional to the rate of cutting.

The magnetic field, current through the Hall element, and Hall voltage are all at right angles to each other.

The operation of an electrical generator relies on electromagnetic induction.