What is the main advantage of using a digital storage oscilloscope?

a) uses digital storage

b) uses analog storage

c) uses mixed mode storage

d) uses disc storage

Answer: a

Explanation: The disadvantage of a analog storage oscilloscope is overcome in a

digital storage oscilloscope. The unreliable storage method in a analog storage

oscilloscope is overcome in a digital storage oscilloscope. The digital storage

oscilloscope makes use of digital storage for the memory.

The memory of a digital storage oscilloscope is limited.

a) True

b) False

Answer: b

Explanation: In a digital storage oscilloscope, the memory can store data as long as

required without degradation. It makes use of complex signal processing

techniques through high speed digital signal processing.

The waveform is stored in _________

a) compressed form

b) analog form

c) digital form

d) mixed form

Answer: c

Explanation: The waveform to be studied is stored in digital form in the digital

storage oscilloscope. It is digitized and stored in a digital memory.

Which oscilloscope is used in a digital storage oscilloscope?

a) multi trace

b) dual trace

c) modern

d) conventional

Answer: d

Explanation: A digital storage oscilloscope makes use of a conventional cathode

ray tube. As a result, the cost is reduced.

Power requirement is _________

a) low

b) high

c) medium

d) zero

Answer: a

Explanation: In a digital storage oscilloscope, the power required by the memory is

less. It can be supplied through the means of a small battery.

The stored image can be displayed _________

a) for a limited time

b) for infinite time

c) for zero time

d) for an intermediate time

View Answer

Answer: b

Explanation: In a digital storage oscilloscope, the stored image can be displayed

for a long time as long as the power supply to the digital memory is kept intact

without any kind of disruption.

The analog signal is digitized using _________

a) D/A converter

b) Oscillator

c) A/D converter

d) Rectifier

Answer: c

Explanation: In a digital storage oscilloscope, the analog signal is digitized by

making use of an analog to digital converter. After digitizing the waveform is

loaded into a computer and can be analyzed.

How is the data displayed?

a) through a screen

b) through a computer

c) through an FPGA

d) through a microprocessor

Answer: d

Explanation: In a digital storage oscilloscope, the data is displayed by passing it

through a microprocessor which processes the data and displays the waveform onto

a screen.

A digital storage oscilloscope has _________

a) 3 modes

b) 2 modes

c) 4 modes

d) 5 modes

Answer: a

Explanation: In a digital storage oscilloscope, there are three modes of operation.

They are as follows:

• Store

• Roll

• Hold or Save.

Oscilloscope is __________

a) a ohmmeter

b) an ammeter

c) a voltmeter

d) a multimeter

Answer: c

Explanation: Oscilloscope is basically a voltmeter. It employs the movement of an

electronic gun assembly with respect to a fluorescent screen. The screen produces

the movement of the visible spot.

Electron beam is deflected in __________

a) 1 direction

b) 4 directions

c) 3 directions

d) 2 directions

Answer: d

Explanation: The electron beam in an oscilloscope can be deflected in two

directions, namely the horizontal (x-direction) and the vertical (y-direction). Two

dimensional displays are produced as a result.

Typically oscilloscope represents __________

a) current and time

b) resistance and time

c) voltage and time

d) power and time

Answer: c

Explanation: In an oscilloscope typically the horizontal or x-axis represents the

time while the vertical or y-axis represents the variation in the magnitude of the

input signal.

Which of the following part is called as the heart of CRO?

(a) Sweep generator

(b) Trigger circuit

(c) CRT

(d) Amplifier

ANS: C

What is the full form of the abbreviation D.S.O?

(a) Dual System Oscillator

(b) Dual Storage Oscillator

(c) Digital System Oscilloscope

(d) Digital Storage Oscilloscope

ANS :D

Which function makes a stable waveform displayed on the DSO screen?

(a) Auto set function

(b) Triggering function

(c) Saving a setup function

(d) Recalling a setup function

ANS: A

Which acquisition mode is used by the DSO to sample the highest and lowest

values of the input signal?

(a) Auto mode

(b) Sample mode

(c) Average mode

(d) Peak detect mode

ANS: D

What is the purpose of sampling in DSO operation?

(a) Control time base signal

(b) Convert analog signal to digital

(c) Convert digital signal to analog

(d) Visualize the signal on screen

ANS: A

Which function is performed by the sample / Hold circuit along with the ADC

in Digital Storage Oscilloscope?

(a) Storage

(b) Data display

(c) Data acquisition

(d) Upload to computer

ANS: C

What is the advantage of the Digital Storage Oscilloscope?

(a) Process signals in analog format

(b) Make measurement of digital data

(c) Stores digital data for later viewing

(d) Electron beam moves across the screen

ANS: C

Which part of the DSO stores the processed data of input signal voltage?

(a) Memory

(b) Screen display

(c) Analog to digital converter

(d) Digital to analog converter

ANS : A

What is the name of the factory setup done to the Digital Storage

Oscilloscope?

(a) Normal setup

(b) Factory setup

(c) Default setup

(d) Measurement setup

ANS: C

Digital multimeter is used for _________

a) measuring a.c. and d.c. current, voltage and resistance

b) measuring a.c. current and voltage

c) measuring d.c. current and resistance

d) measuring a.c. voltage and resistance

Answer: a

Explanation: Digital multimeter is usually used for the measurement of a.c.

current, voltage and resistance. It is also used for the measurement of d.c. current,

voltage and resistance as well over several range.

Current is converted to voltage __________

a) through a voltmeter

b) through a resistance

c) through an ammeter

d) through a galvanometer

Answer: b

Explanation: Current is passed through a low shunt resistance and is converted to

voltage. A.C. quantities are converted to D.C. through various rectifier and filter

circuits. Voltmeter and ammeter are used for voltage and current measurement

respectively.

For resistance measurement, meter contains _________

a) high current source

b) medium current source

c) low current source

d) low voltage source

Answer: c

Explanation: Usually in the measurement of resistance, meter consists of a

precision low current source applied across an unknown resistance which gives a

d.c. voltage.

Quantities are digitised using _________

a) D/A converter

b) oscillator

c) amplifier

d) A/D converter

Answer: d

Explanation: Quantities such as current, voltage and resistance are digitised by

making use of an A/D converter. They are then displayed on the screen by making

use of a digital display.

Analog mulimeters require power supply.

a) True

b) False

Answer: b

Explanation: Analog multimeters are less affected by electric noise and isolation

problems. As a result analog multimeters don’t require a power supply.

Output of a digital multimeter is _________

a) mechanical

b) optical

c) electrical

d) analog

Answer: c

Explanation: Digital multimeter gives an electrical signal as the output. A/D

converter is employed for the conversion from analog to digital signal. This can be

used for interfacing with external equipment.

Basic building blocks of digital multimeter are _________

a) oscillator, amplifier

b) diode, op amp

c) rectifier, schmitt trigger

d) A/D, attenuator, counter

Answer: d

Explanation: Usually dual slope integrating type ADC is preferred in multimeter. It

basically consists of several A/D converters, counter circuits and an attenuation

circuit.

Resistance is measured using _________

a) constant current source

b) constant voltage source

c) variable current source

d) variable voltage source

Answer: a

Explanation: Constant current source is used to measure resistance in a digital

multimeter. Standard known value of current is passed through an unknown

resistance and the drop in voltage across the resistance is measured.

A.C. voltages are measured using _________

a) oscillators and op amps

b) rectifiers and filters

c) resistor and capacitor

d) inductor and resistor

Answer: b

Explanation: Rectifiers and filter circuits with various configurations are employed

for measuring A.C. voltages. A.C. is converted to D.C. and is applied to the A/D

converter.

Electronic multimeter measures ________

a) voltage, current and resistance

b) voltage and current

c) current and power

d) energy and power

Answer: a

Explanation: A.C. as well as D.C. voltage, current and resistance can be measured

by making use of an electronic multimeter. It is also known as a voltage-ohm

meter.

Basic circuit of multimeter consists ________

a) of a.c. amplifier

b) of d.c. amplifier

c) operational amplifier

d) power amplifier

Answer: b

Explanation: A.C. as well as D.C. voltage, current and resistance can be measured

by making use of an electronic multimeter. The basic circuit of a multimeter is

made up of d.c. amplifier circuit in the form of a balanced bridge.

Input signal magnitude is limited by ________

a) button

b) resistance

c) attenuator

d) voltage

Answer: c

Explanation: A range switch is provided in an electronic multimeter in order to

limit the input signal in terms of magnitude. We can adjust the input attenuator and

limit the input signal in terms of magnitude.

Electronic multimeter consists of a rectifier.

a) True

b) False

Answer: a

Explanation: An electronic multimeter is used for the measurement of A.C. as well

as D.C. voltage, current and resistance. It consists of a rectifier section that is used

to convert the a.c. input signal to d.c. voltage.

Multimeter can be used as an ammeter by ________

a) connecting series resistances

b) making use of a transducer

c) making use of a transformer

d) connecting shunts

Answer: d

Explanation: An electronic multimeter can be used as an ammeter by making use

of shunt resistances across the meter. This is achieved by range selecting switch.

Multimeter can be used for D.C. voltage measurement by ________

a) connecting series resistances

b) connecting shunt resistances

c) connecting star delta resistances

d) using a switch

Answer: a

Explanation: We can obtain a wide range of D.C. voltage from a multimeter by

connecting various series resistances in the circuit through a range selection

switch. By adjusting the value of the resistance we get the required D.C. voltage.

Multimeter can be used only for low resistance measurement.

a) True

b) False

Answer: b

Explanation: A multimeter is used for the measurement of A.C. as well as D.C.

voltage, current and resistance. By manipulating the scale with a multiplication

factor of 100 and 10, 000 we can make use of a multimeter for measuring high

resistances.

What is the role of a rectifier in a multimeter?

a) bias purpose

b) thermal stability

c) rectification

d) inversion

Answer: c

Explanation: When the multimeter is used for the measurement of A.C. voltages,

rectifier section is used. It mainly performs the conversion of the input A.C.

voltage into D.C. for the measurement of A.C. voltage.

What is the initial setting made in a multimeter before it is used for

measuring resistance?

a) fine adjustment

b) instrument is open circuited

c) voltage is applied

d) zero adjustment

Answer: d

Explanation: Initially the multimeter is short circuited and zero adjustment control

is made. This is done till the meter reads zero resistance or in other words displays

full scale current.

An ammeter is connected in …………….. with the circuit element whose

current we wish to measure

1. Series

2. Parallel

3. Series or parallel

4. None of the above

Answer : 1

A galvanometer in series with a high resistance is called ……………

1. An ammeter

2. A voltmeter

3. A wattmeter

4. None of the above

Answer : 2

An ammeter should have ………….. resistance

1. Infinite

2. Very large

3. Very low

4. None of the above

Answer : 3

A voltmeter is connected in a ………….. with the circuit component across

which potential difference is to be measured

1. Parallel

2. Series

3. Series or parallel

4. None of the above

Answer : 1

A voltmeter should have ………. resistance

1. Zero

2. Very high

3. Very low

4. None of the above

Answer : 2

The sensitivity of a multimeter is given in ……………..

1. Ω

2. Amperes

3. kΩ/V

4. none of the above

Answer : 3

A VTVM has ………. input resistance than that of a multimeter

1. More

2. Less

3. Same

4. None of the above

Answer : 1

The input resistance of a VTVM is about ………..

1. 1000 Ω

2. 10 kΩ

3. 20 kΩ

4. 10 MΩ

Answer : 4

If the negative potential on the control grid of CRT is increased, the intensity

of spot ………….

1. Is increased

2. Is decreased

3. Remains the same

4. None of the above

Answer : 2

For display of signal pattern ………… voltage is applied to the horizontal

plates of a CRO

1. Sinusoidal

2. Rectangular

3. Sawtooth

4. None of the above

Answer : 3

The sensitivity of a voltmeter which uses a 100 μA meter movement is …

1. 1 kΩ/V

2. 10 kΩ/V

3. 5 kΩ/V

4. Data insufficient

Answer : 2

Q17. What is the total resistance of a voltmeter on the 10 V range when the

meter movement is rated for 50 μA of full-scale current?

1. 10 kΩ

2. 20 kΩ

3. 200 kΩ

4. None of the above

Answer : 3

The materil used to coat inside the face of CRT is …………..

1. Carbon

2. Sulphur

3. Silicon

4. Phosphorous

Answer : 4

When an ammeter is inserted in the circuit, the circuit current will ………..

1. Increase

2. Decrease

3. Remain the same

4. None of the above

Answer : 2

(An ammeter is always connected in series with the circuit. An ammeter has

some resistance. When resistance is connected in series, the total resistance of

the circuit becomes more, hence current flowing through the circuit becomes

less.)

A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement.

What is the half-scale resistance for this movement?

1. 3 kΩ

2. 6 kΩ

Answer : 1

The most accurate device for measuring voltage is ………….

a. Voltmeter

b. Multimeter

c. CRO

d. VTVM

Answer : 3

(We use an oscilloscope instead of a voltmeter or a multimeter is because

a multimeter cannotvisually depict waveforms to reveal signal strength, wave

shape or the instantaneous value ofthe signal. ... An oscilloscope will also

graphically showdistortion and noise that may be present in the signal.)

The horizontal plates of a CRO are supplied with …………. to observe the

waveform of signal.

1. Sinusoidal wave

2. Cosine wave

3. Sawtooth wave

4. None of the above

Answer : 3

A CRO is used to measure ………….

1. Voltage

2. Frequency

3. Phase

4. All of above

Answer : 4

Which of the following is likely to have the largest resistance?

1. Voltmeter of range 10 V

2. Moving coil galvanometer

3. Ammeter of range 1 A

4. A copper wire of length 1 m and diameter 3 mm

Answer : 1

An ideal ammeter has ………… resistance

1. Low

2. Infinite

3. Zero

4. High

Answer : 3

The resistance of an ideal voltmeter is …………

1. Low

2. Infinite

3. Zero

4. High

Answer : 2

In function generator, the output waveform of integrator is

A. Sinusoidal

B. Square

C. Triangular

D. Saw-tooth

ANS: C

The basic difference between square wave and pulse generator is their

A. Waveforms shape

B. Duty cycles

C. Frequency range

D. Cost

ANS:B

The full range of audibility in audio frequency oscillator is

A. 0 to 20 Hz

B. 20 Hz to 2 kHz

C. 20 Hz to 20 kHz

D. 20 Hz to 20 MHz

ANS:C

The full range of audibility in audio frequency oscillator is

A. 0 to 20 Hz

B. 20 Hz to 2 kHz

C. 20 Hz to 20 kHz

D. 20 Hz to 20 MHz

In an unregulated power supply, if load current increases, the output voltage

………..

1. Remains the same

2. Decreases

3. Increases

4. None of the above

Answer : 2

In an unregulated power supply, if input a.c. voltage increases, the output

voltage …….

1. Increases

2. Decreases

3. Remains the same

4. None of the above

Answer : 1

A power supply which has voltage regulation of ……….. is unregulated power

supply

1. 0 %

2. 5 %

3. 10 %

4. 8%

Answer : 3

Commercial power supplies have voltage regulation ………….

1. of 10%

2. of 15%

3. of 25%

4. within 1%

Answer : 4

An ideal regulated power supply is one which has voltage regulation of

…………

1. 0%

2. 5%

3. 10%

4. 1%

Answer : 1

A Zener diode utilises ………… characteristic for voltage regulation

1. Forward

2. Reverse

3. Both forward and reverse

4. None of the above

Answer : 2

Zener diode can be used as …………

1. c. voltage regulator only

2. c. voltage regulator only

3. both d.c. and a.c. voltage regulator

4. none of the above

Answer : 3

A Zener diode …………..

1. Is a battery

2. Acts like a battery in the breakdown region

3. Has a barrier potential of 1 V

4. Is forward biased

Answer : 2

Two similar 15 V Zeners are connected in series. What is the regulated output

voltage?

1. 15 V

2. 5 V

3. 30 V

4. 45 V

Answer : 3

A power supply can deliver a maximum rated current of 0.5 A at full-load

output voltage of 20 V. What is the minimum load resistance that you can

connect across the supply?

1. 10 Ω

2. 20 Ω

3. 15 Ω

4. 40 Ω

Answer : 4

In a regulated power supply, two similar 15 V zeners are connected in series.

The input voltage is 45 V d.c. If each Zener has a maximum current rating of

300 mA, what should be the value of the series resistance?

1. 10 Ω

2. 50 Ω

3. 25 Ω

4. 40 Ω

Answer : 2

When load current is zero, the Zener current will be ………

1. Zero

2. Minimum

3. Maximum

4. None of the above

Answer : 3

Which of the following can be a source of supply in dc power supplies?

a) Battery

b) Dry cell

c) Full wave rectifier

d) All of the mentioned

Answer: d

Explanation: Source of supply will be a battery, dry cell or full wave rectifier etc.

Which of the application’s filters used for?

a) Reducing ripples

b) Increasing ripples

c) Increasing phase change

d) Increasing amplitude

Answer: a

Explanation: Ripples are ac components and filters are used for eliminating ac

components from a signal.

Which of the following represent a change of output voltage when load

current is increased?

a) Line regulation

b) Load regulation

c) Current regulation

d) Voltage regulation

Answer: b

Explanation: Load regulation is the process of fractional change of output voltage

when load current is increased from zero to maximum value.

Which of the following generate output voltage much closer to true value?

a) True generator

b) Precision generator

c) Output generator

d) Accurate generator

Answer: b

Explanation: Precision generators are one which generates output voltage much

closer to the true value.

Why zener diodes are provided in dc supply?

a) For forward conduction

b) For reverse conduction

c) For reference voltage

d) For increasing amplitude

Answer: c

Explanation: Zener diodes in dc power supplies are used for providing a reference

voltage used for comparison.

Stability of output voltage is entirely depended on ______________

a) Stability of transformer

b) Stability of zener diode

c) Quality of wires

d) Capacitor values

Answer: b

Explanation: Stability of zener diodes used is an important factor in determining

the stability of output voltage in dc power supply.

For excellent stability, the zener diode is kept in temperature controlled

casket.

a) True

b) False

Answer: a

Explanation: Zener diode is kept on temperature controlled casket due to its low

temperature coefficient which may lead to less stability.

For instrumentation system, precision variable voltage-reference system is

necessary.

a) True

b) False

Answer: a

Explanation: Precision variable voltage reference system is used for comparing

voltage with a reference voltage and can be used in the instrumentation system.

Which of the following can be used as a comparator?

a) Zener diode

b) Diode

c) Operational amplifier

d) All of the mentioned

Answer: c

Explanation: Operational amplifier can be used as a comparator circuit.

Which of the following are not the standard value of Zener diodes?

a) 5.1 V

b) 5.6 V

c) 5.8V

d) 6.2V

Answer: c

Explanation: Standard values of zener voltages are 5.1V, 5.6V, 6.2V and 9.1V etc.

A regulated DC power supply is also known as a ____.

linear power supply

dual power supply

hyper power supply

None of the above

ANS: linear power supply

The basic building blocks of a regulated DC power supply contains:

A step-down transformer

A rectifier and A DC filter

A regulator

All of the above

View Answer

All of the above