R4RIN – MCQs, Mock Tests | Electrical measurements Electrical Measurement MCQ Question Set 9

Accuracy depends on ______

1. input voltage
2. drop across the capacitor
3. magnitude and stability of pulse generator
4. magnitude of the ramp

✅ Correct Answer: 3

In a potentiometric DVM ____

1. voltage is compared
2. current is compared
3. resistance is compared
4. power is compared

✅ Correct Answer: 1

How to obtain balance?

1. by using a detector
2. by changing the pot setting
3. by supplying voltage
4. by using a transformer

✅ Correct Answer: 2

In a potentiometric DVM, balance is obtained manually.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Unknown voltage is _____

1. converted to current
2. boosted
3. filtered
4. measured using a voltmeter

✅ Correct Answer: 3

How is the reference voltage obtained?

1. from a fixed current source
2. from a variable voltage source
3. from a variable current source
4. from a fixed voltage source

✅ Correct Answer: 4

Feedback voltage is applied to the ________

1. comparator
2. error amplifier
3. potentiometer
4. sliding contact

✅ Correct Answer: 1

Output of the comparator is known as ___

1. amplified signal
2. error signal
3. feedback signal
4. attenuated signal

✅ Correct Answer: 2

Slider movement depends on ______

1. current magnitude
2. resistance magnitude
3. voltage magnitude
4. power magnitude

✅ Correct Answer: 3

Accuracy of a potentiometric DVM is _____

1. zero
2. medium
3. low
4. high

✅ Correct Answer: 4

Why is dual slope method preferred over ramp techniques?

1. no noise
2. partial noise
3. average noise
4. maximum noise

✅ Correct Answer: 1

What is the significance of the name dual slope method?

1. it has two slopes
2. it integrates the input twice
3. it uses two inputs
4. it has two outputs

✅ Correct Answer: 2

What is the output voltage in a dual slope integrating type DVM?

1. differential of the input
2. multiple of the input
3. integral of the input
4. zero

✅ Correct Answer: 3

Input voltage depends on ______

1. resistance
2. capacitance
3. current
4. time-period

✅ Correct Answer: 4

Noise rejection is poor.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

What is the effect of the capacitor on the output?

1. no effect
2. charging effect
3. electrostatic effect
4. magnetic effect

✅ Correct Answer: 1

What is the effect of clock on the voltage?

1. voltage doubles with clock input
2. voltage halves with clock input
3. no effect
4. voltage becomes zero with clock input

✅ Correct Answer: 3

What is the counter value at the beginning?

1. one
2. ten
3. three
4. zero

✅ Correct Answer: 4

What is the maximum count of the counter?

1. 9999
2. 0
3. 500
4. 1000

✅ Correct Answer: 1

Resolution of a DVM is given by _______

1. R = 1⁄10n
2. R = 1
3. R = 10n
4. R = n⁄10

✅ Correct Answer: 1

What is the resolution for a 3 digit display?

1. 1 %
2. 0.1 %
3. 0.001 %
4. 10 %

✅ Correct Answer: 2

Sensitivity is largest change in input.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Sensitivity of a DVM is given by _______

1. S = 1
2. S = (fs)min
3. S = (fs)min × R
4. S = R

✅ Correct Answer: 3

What is the resolution of a 3 digit display on 1 V range?

1. 1 V
2. 0.1 V
3. 0.01 V
4. 0.001 V

✅ Correct Answer: 4

How is 11.87 V displayed on a 10 V range for a 4 digit display?

1. 11.870
2. 1.1870
3. 118.7
4. 0.1187

✅ Correct Answer: 1

Consider a 3 digit display for a DVM with an accuracy of ± 0.5 % for a reading of ± 1 digit. Compute the error for 5 V reading on a 10 V range.

1. ± 10 V
2. ± 0.035 V
3. ± 0.05 V
4. ± 1 V

✅ Correct Answer: 2

Clock pulses are controlled ______

1. automatically
2. using microcontrollers
3. using valves
4. manually

✅ Correct Answer: 4

Autoranging means ______

1. automatic ranging
2. fixed ranging
3. automobile ranging
4. constant ranging

✅ Correct Answer: 1

A 3 digit display DVM with a maximum reading of 1999 indicates _______

1. increase by a factor
2. reduction by a factor
3. no change in value
4. depends on the circuit components

✅ Correct Answer: 2

For a value less than 0200, the instrument should ________

1. read values less than 0200 correctly
2. read values randomly
3. automatically switch range
4. should not respond at all

✅ Correct Answer: 3

ADC counter ________

1. attenuates the signal
2. converts digital to analog
3. converts analog to digital
4. contains information

✅ Correct Answer: 4

ADC gives polarity indication.

1. True
2. False
3. all of the above
4. All of the Mentioned

✅ Correct Answer: 1

Integration period is obtained by ______

1. using signal amplitude
2. counting the pulse
3. measuring time
4. by differentiating the signal

✅ Correct Answer: 2

Integrator’s output is ______

1. attenuated through a filter
2. feedback to the input
3. stored in a flip-flop
4. differentiated

✅ Correct Answer: 3

Old information is used to set range relays.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Digital multimeter is used for _____

1. measuring a.c. and d.c. current, voltage and resistance
2. measuring a.c. current and voltage
3. measuring d.c. current and resistance
4. measuring a.c. voltage and resistance

✅ Correct Answer: 1

Current is converted to voltage ______

1. through a voltmeter
2. through a resistance
3. through an ammeter
4. through a galvanometer

✅ Correct Answer: 2

For resistance measurement, meter contains ____

1. high current source
2. medium current source
3. low current source
4. low voltage source

✅ Correct Answer: 3

Quantities are digitised using _______

1. D/A converter
2. oscillator
3. amplifier
4. A/D converter

✅ Correct Answer: 4

Analog mulimeters require power supply.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Output of a digital multimeter is _____

1. mechanical
2. optical
3. electrical
4. analog

✅ Correct Answer: 3

Basic building blocks of digital multimeter are _____

1. oscillator, amplifier
2. diode, op amp
3. rectifier, schmitt trigger
4. A/D, attenuator, counter

✅ Correct Answer: 4

Resistance is measured using _____

1. constant current source
2. constant voltage source
3. variable current source
4. variable voltage source

✅ Correct Answer: 1

A.C. voltages are measured using _______

1. oscillators and op amps
2. rectifiers and filters
3. resistor and capacitor
4. inductor and resistor

✅ Correct Answer: 2

Q factor is called ______

1. Quality factor
2. Quantity factor
3. Queen factor
4. Quarter factor

✅ Correct Answer: 1

Q factor is also defined as the ratio of _______

1. resistance to reactance
2. reactance to resistance
3. power to voltage
4. current to power

✅ Correct Answer: 2

What is a Q meter?

1. quality meter
2. quantity meter
3. instrument
4. detector

✅ Correct Answer: 3

Q meter works on the principle of _______

1. barkhausen criterion
2. piezoelectric effect
3. parallel resonance
4. series resonance

✅ Correct Answer: 4

A practical Q meter consists of ______

1. Wien bridge oscillator
2. AF oscillator
3. RF oscillator
4. Crystal oscillator

✅ Correct Answer: 3

Voltage across the shunt is measured by ________

1. voltmeter
2. multimeter
3. thermocouple
4. thermometer

✅ Correct Answer: 3