Electrical measurements MCQ Quiz Hub

1. An electronic energy meter makes use of ______
IC
Transformer
CRO
Multimeter

2. Measurement of energy involves _____
inductance and capacitance measurement
power consumption and time duration
resistance measurement and voltage drop
current consumption and voltage drop

3. Average power is _______
product of voltage and current
product of average current and voltage
product of instantaneous voltage and current
product of absolute voltage and current

4. What is the role of a multiplier?
it multiplies the voltage and current
divides the alternating voltage and current
supplies instantaneous voltage and current
multiplies alternating voltage and current

5. Frequency of oscillation in an electronic energy meter depends on ______
output current of multiplier
output voltage of multiplier
output power of multiplier
input resistance of multiplier

6. Analog signal is converted _______
into oscillations
into digital
into pulses
into current

7. An electronic energy meter is advantageous compared to conventional ones.
True
False
all of the above
None of the mentioned

8. Energy meter can be directly used in measurement.
True
False
all of the above
None of the mentioned

9. Creeping in an energy meter can be found using ______
creep adjustment
preliminary light load adjustment
full load u.p.f adjustment
light load adjustment

10. Preliminary light load adjustment involves _______
applying rated voltage across current coil
making use of a light load
applying rated voltage across pressure coil
adjusting the light load

11. Creep adjustment involves _____
adjusting the creep
exciting the current coil
adjusting the turns ratio
exciting the pressure coil

12. Light load adjustment involves ________
applying rated voltage across the pressure coil
adjusting a light load
applying rated current across the transformer
applying rated voltage across the current coil

13. Low power factor adjustment involves _____
adjusting the power factor at lower loads
applying rated voltage to pressure coil and a p.f. of 0.5 for current coil
only applying rated voltage to pressure coil
only a p.f. of 0.5 for the current coil

14. Full load u.p.f adjustment involves ______
adjusting the loads at unity power factor
applying rated voltage to pressure coil and a p.f. of unity for current coil
only applying rated voltage to pressure coil
only a p.f. of unity for the current coil

15. Phase sequence indicator gives the maximum value of phase voltages.
True
False
all of the above
None of the mentioned

16. Synchronization of A.C. supply means ________
different phase sequence
same phase sequence
zero phase
using a transformer

17. How many types of phase sequence indicators are there?
1
5
2
10

18. A rotating phase sequence indicator consists of _____
1 coil
2 coils
5 coils
3 coils

19. The three coils are _____
star connected
delta connected
not connected
shorted

20. Excitation of the three coils produces _____
a static magnetic field
a rotating magnetic field
a static electric field
a rotating electric field

21. Eddy e.m.f produces a torque.
True
False
all of the above
None of the mentioned

22. Disc rotation is determined by ____
the supply voltage
an arrow
the turns ratio
the load current

23. Low voltage signals can be measured by _______
amplifiers
transformers
transformers
voltmeters

24. Input impedance of an electronic voltmeter is _____
low
high
medium
zero

25. Meter can be isolated from the circuit in a basic D.C. electronic voltmeter.
True
False
all of the above
None of the mentioned

26. Bridge is balanced by ______
galvanometer
oscillator
zero adjustment resistor
head phone

27. What is the effect of the input on the transistor Q2?
bias on Q2 decreases
bias on Q2 is constant
bias on Q2 is zero
bias on Q2 increases

28. What is basic range of a meter?
causes maximum deflection
causes minimum deflection
causes zero deflection
causes medium deflection

29. High range can be obtained in a basic D.C. electronic voltmeter by ________
a transformer
an attenuator
a transducer
a resistor

30. Sensitivity of electronic voltmeter is high.
True
False
all of the above
None of the mentioned

31. Overloading is ________
damages the meter
increases the temperature
doesn’t affect the meter
decreases the sensitivity

32. Input impedance of a voltmeter is ______
high
low
medium
zero

33. Input impedance depends on _____
resistance
capacitance
inductance
voltage

34. At high frequencies the capacitive reactance ____
is constant
increases
decreases
becomes zero

35. Voltage ranges in a meter are _____
5-10-15
20-50-100
0.5-1-1.5
1-3-10

36. Linear meter with 1% accuracy must have ______
100 divisions
50 divisions
200 divisions
500 divisions

37. Decibel covers a small range of values.
True
False
all of the above
None of the mentioned

38. Noise is a function of ______
voltage
current
bandwidth
frequency

39. Current can be measured effectively by making use of ____
d.c. voltmeter
a.c. ammeter
d.c. ammeter
a.c. voltmeter

40. Average responding voltmeter is cheap and accurate.
True
False
all of the above
None of the mentioned

41. R.M.S value means ______
root mean square
rate mean second
root median second
rate mode second

42. Meter reading is obtained by _____
sensing voltage
sensing heat power
sensing current
sensing resistance

43. Measurement of heat power ________
uses a heat sink
uses a thermometer
uses a thermocouple
uses a black body

44. Sufficient heating of the heater is ensured by ______
increasing the temperature
making use of induction coil
amplifying d.c. input
amplifying a.c. input

45. What is the main disadvantage of a true r.m.s responding voltmeter?
presence of transducer
presence of thermocouple
presence of transformer
presence of oscillator

46. What is the naming convention for the two thermocouples?
thermocouple 1 and thermocouple 2
input thermocouple and output thermocouple
measuring thermocouple and balancing thermocouple
internal thermocouple and external thermocouple

47. Sensitivity is of the order of ______
MV
V
GV
mV

48. Response of thermocouples is fast.
True
False
all of the above
None of the mentioned

49. Electronic multimeter measures ______
voltage, current and resistance
voltage, current and resistance
current and power
energy and power

50. Basic circuit of multimeter consists ______
of a.c. amplifier
of d.c. amplifier
operational amplifier
power amplifier