Electrical measurements MCQ Quiz Hub

1. Q meter operator is the principle of _______
Series resonance
Current resonance
Self-inductance
Eddy currents

2. A circuit tuned to a frequency of 1.5 MHz and having an effective capacitance of 150 pF. In this circuit, the current falls to 70.7 % of its resonant value. The frequency deviates from the resonant frequency by 5 kHz. Q factor is?
50
100
150
200

3. A circuit tuned to a frequency of 1.5 MHz and having an effective capacitance of 150 pF. In this circuit, the current falls to 70.7 % of its resonant value. The deviates from the resonant frequency are 5 kHz. Effective resistance of the circuit is?
2 Ω
3 Ω
5.5 Ω
4.7 Ω

4. Q Meter is used to measure ____
Q factor of an inductive coil
Only the effective resistance
Only bandwidth
Q factor of an inductive coil, the effective resistance, and bandwidth

5. CRO stands for _____
Cathode Ray Oscilloscope
Current Resistance Oscillator
Central Resistance Oscillator
Capacitance Resistance Oscilloscope

6. C.R.O gives _______
actual representation
visual representation
approximate representation
incorrect representation

7. Oscilloscope is _______
a ohmmeter
an ammeter
a voltmeter
a multimeter

8. Electron beam is deflected in _______
1 direction
4 directions
3 directions
2 directions

9. CRO is a ______
fast x-y plotter
slow x-y plotter
medium x-y plotter
not a plotter

10. CRO can’t display microseconds time.
True
False
all of the above
None of the mentioned

11. Typically oscilloscope represents ______
current and time
resistance and time
voltage and time
power and time

12. Electron gun section _____
provides sharp beam
provides poorly focussed beam
doesn’t provide any beam
provides electrons only

13. Control grid is given _______
positive voltage
negative voltage
negative voltage
zero voltage

14. What determines light intensity in a CRT?
voltage
current
momentum of electrons
fluorescent screen

15. Effect of negative voltage to the grid is ______
no force
a gravitational force
an attractive force
a repulsive force

16. Electron beam diverges.
True
False
all of the above
None of the mentioned

17. Focusing and accelerating anodes are ____
rectangular
cylindrical
spherical
square

18. Deflection system of a CRT consists of _____
4 plates
6 plates
2 plates
8 plates

19. Horizontal deflection is given by ____
x = Kx
x = Vx
x = 1
x = Kx Vx

20. Vertical deflection is given by ________
y = Ky Vy
y = Ky
x = 1
y = Vy

21. What provides a periodic voltage waveform?
sweep generator
voltmeter
oscillator
amplifier

22. Visible spot must be moved in _______
two directions
one direction
three directions
four directions

23. Spot is displayed only when _______
frequencies are different
frequencies are zero
frequencies are same
voltage is high

24. What is done to make the trace horizontal?
negative voltage is applied
positive voltage is applied
no voltage is applied
voltage is synchronised

25. A single cycle appears on the screen when _______
sweep and signal frequencies are equal
sweep and signal frequencies are not equal
sweep and signal frequencies are zero
sweep frequency is greater than signal frequency

26. What is the flyback period?
voltage is very high
current is very low
voltage is zero
current is very high

27. Sinusoidal voltage is not observed on the screen.
True
False
all of the above
None of the mentioned

28. During trace time, voltage is decreasing with time.
True
False
all of the above
None of the mentioned

29. Light produced in a screen is ____
disappears immediately
does not disappear at all
is not visible to the eye
disappears slowly

30. What is the role of CRT?
to emit electrons
to emit protons
to emit neutrons
to emit alpha particles

31. Input signals are amplified using _______
rectifier
amplifier
oscillator
op amp

32. Amplifier stage is ______
half band
full band
wide band
narrow band

33. Role of an attenuator is ________
to boost the signal
to distort the signal
to remove noise
to improve the operation

34. Amplifier is multiple stage in a CRO.
True
False
all of the above
None of the mentioned

35. Input stage in the amplifier consists of _____
oscillator
attenuator
rectifier
op amp

36. Phase inverter is used in an amplifier in the CRO because ____
phase inversion is needed
no phase inversion is needed
it is needed to operate a push pull
it provides voltage stability

37. BJT is used in the amplifier stage.
True
False
all of the above
None of the mentioned

38. Why is a delay line used in a CRO?
to boost the signal
to distort the signal
to provide signal delay
for stability

39. CRO uses ______
2 delay lines
3 delay lines
4 delay lines
5 delay lines

40. T section in a delay circuit of CRO acts as ____
high pass filter
low pass filter
band pass filter
band reject filter

41. Lumped parameter delay line consists of______
RC networks
RL networks
LC networks
Resistive networks

42. Delay for the T section is given by ____
ts = 1⁄fc
ts = 1
ts = 1⁄π
ts = 1⁄πfc

43. Distributed parameter delay line is a transmission line.
True
False
all of the above
None of the mentioned

44. Inductance does not affect a transmission line.
True
False
all of the above
None of the mentioned

45. Typical values for a distributed parameter delay line are ________
Zo = 10 Mῼ and td = 10 nsec/m
Zo = 1 kῼ and td = 500 nsec/m
Zo = 1000 ῼ and td = 180 nsec/m
Zo = 100 Gῼ and td = 275 nsec/m

46. What is the effect of the signal delay on the sweep generator?
no effect
input increases in magnitude
output doesn’t get any delay
output gets sufficient delay

47. Front panel of a CRO has ______
4 sections
8 sections
15 sections
20 sections

48. What is the role of the intensity section in a CRO?
decreases the light intensity
controls light intensity
increases the light intensity
keeps the light intensity zero

49. What is the role of the focus section in a CRO?
increases the focus
decreases the focus
controls sharpness
maintains the focus zero

50. What is the role of astigmatism in a CRO?
increases the intensity
used for voltage stability
diminishes the intensity
focus control

51. What is the role of scale illumination in a CRO?
measurement
illumination
sharpness
stability

52. What is the role of an invert in a CRO?
inverts the output
inverts the input
attenuates the input
magnifies the input

53. X10 in a CRO means ________
one tenth
control knob
10 times as normal
attenuate the voltage by 10 times

54. Position knob in a CRO indicates _____
voltage position only
time position only
current position only
any pattern’s position

55. Alternate is used to shift the inputs.
True
False
all of the above
None of the mentioned