Electrical measurements MCQ Quiz Hub

1. Accuracy depends on ______
input voltage
drop across the capacitor
magnitude and stability of pulse generator
magnitude of the ramp

2. In a potentiometric DVM ____
voltage is compared
current is compared
resistance is compared
power is compared

3. How to obtain balance?
by using a detector
by changing the pot setting
by supplying voltage
by using a transformer

4. In a potentiometric DVM, balance is obtained manually.
True
False
all of the above
None of the mentioned

5. Unknown voltage is _____
converted to current
boosted
filtered
measured using a voltmeter

6. How is the reference voltage obtained?
from a fixed current source
from a variable voltage source
from a variable current source
from a fixed voltage source

7. Feedback voltage is applied to the ________
comparator
error amplifier
potentiometer
sliding contact

8. Output of the comparator is known as ___
amplified signal
error signal
feedback signal
attenuated signal

9. Slider movement depends on ______
current magnitude
resistance magnitude
voltage magnitude
power magnitude

10. Accuracy of a potentiometric DVM is _____
zero
medium
low
high

11. Why is dual slope method preferred over ramp techniques?
no noise
partial noise
average noise
maximum noise

12. What is the significance of the name dual slope method?
it has two slopes
it integrates the input twice
it uses two inputs
it has two outputs

13. What is the output voltage in a dual slope integrating type DVM?
differential of the input
multiple of the input
integral of the input
zero

14. Input voltage depends on ______
resistance
capacitance
current
time-period

15. Noise rejection is poor.
True
False
all of the above
None of the mentioned

16. What is the effect of the capacitor on the output?
no effect
charging effect
electrostatic effect
magnetic effect

17. What is the effect of clock on the voltage?
voltage doubles with clock input
voltage halves with clock input
no effect
voltage becomes zero with clock input

18. What is the counter value at the beginning?
one
ten
three
zero

19. What is the maximum count of the counter?
9999
0
500
1000

20. Resolution of a DVM is given by _______
R = 1⁄10n
R = 1
R = 10n
R = n⁄10

21. What is the resolution for a 3 digit display?
1 %
0.1 %
0.001 %
10 %

22. Sensitivity is largest change in input.
True
False
all of the above
None of the mentioned

23. Sensitivity of a DVM is given by _______
S = 1
S = (fs)min
S = (fs)min × R
S = R

24. What is the resolution of a 3 digit display on 1 V range?
1 V
0.1 V
0.01 V
0.001 V

25. How is 11.87 V displayed on a 10 V range for a 4 digit display?
11.870
1.1870
118.7
0.1187

26. 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.
± 10 V
± 0.035 V
± 0.05 V
± 1 V

27. Clock pulses are controlled ______
automatically
using microcontrollers
using valves
manually

28. Autoranging means ______
automatic ranging
fixed ranging
automobile ranging
constant ranging

29. A 3 digit display DVM with a maximum reading of 1999 indicates _______
increase by a factor
reduction by a factor
no change in value
depends on the circuit components

30. For a value less than 0200, the instrument should ________
read values less than 0200 correctly
read values randomly
automatically switch range
should not respond at all

31. ADC counter ________
attenuates the signal
converts digital to analog
converts analog to digital
contains information

32. ADC gives polarity indication.
True
False
all of the above
All of the Mentioned

33. Integration period is obtained by ______
using signal amplitude
counting the pulse
measuring time
by differentiating the signal

34. Integrator’s output is ______
attenuated through a filter
feedback to the input
stored in a flip-flop
differentiated

35. Old information is used to set range relays.
True
False
all of the above
None of the mentioned

36. Digital multimeter is used for _____
measuring a.c. and d.c. current, voltage and resistance
measuring a.c. current and voltage
measuring d.c. current and resistance
measuring a.c. voltage and resistance

37. Current is converted to voltage ______
through a voltmeter
through a resistance
through an ammeter
through a galvanometer

38. For resistance measurement, meter contains ____
high current source
medium current source
low current source
low voltage source

39. Quantities are digitised using _______
D/A converter
oscillator
amplifier
A/D converter

40. Analog mulimeters require power supply.
True
False
all of the above
None of the mentioned

41. Output of a digital multimeter is _____
mechanical
optical
electrical
analog

42. Basic building blocks of digital multimeter are _____
oscillator, amplifier
diode, op amp
rectifier, schmitt trigger
A/D, attenuator, counter

43. Resistance is measured using _____
constant current source
constant voltage source
variable current source
variable voltage source

44. A.C. voltages are measured using _______
oscillators and op amps
rectifiers and filters
resistor and capacitor
inductor and resistor

45. Q factor is called ______
Quality factor
Quantity factor
Queen factor
Quarter factor

46. Q factor is also defined as the ratio of _______
resistance to reactance
reactance to resistance
power to voltage
current to power

47. What is a Q meter?
quality meter
quantity meter
instrument
detector

48. Q meter works on the principle of _______
barkhausen criterion
piezoelectric effect
parallel resonance
series resonance

49. A practical Q meter consists of ______
Wien bridge oscillator
AF oscillator
RF oscillator
Crystal oscillator

50. Voltage across the shunt is measured by ________
voltmeter
multimeter
thermocouple
thermometer