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Electrical Measurement MCQ Question Set 2
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1. Why a Wheatstone bridge can’t be used for signal conditioning?
due to the galvanometer
due to excessive current flow
due to the e.m.f source used
due to lead wires
2. How to minimize the drift in the value of resistance measured using a Wheatstone bridge?
by using a high precision null detector
by keeping the lead wire resistances within 0.2 mΩ
by using a e.m.f source of minimum value
by minimizing the flow of current
3. Low resistance refers to _____
resistances of the order of 1ῼ
resistances of the order of 1kῼ
resistances of the order of 1mῼ
resistances of the order of 1Mῼ
4. What is the significance of measuring low resistances?
voltage drop across the circuit is high
contact and lead resistances are appreciable
there is no power loss
no current flows through the bridge circuit
5. How is the voltage drop across a low resistance related to lead resistance?
it contains contact resistance
it depends on the magnitude of voltage drop
it depends on the type of null detector used
It does not contain any contact resistance
6. Which is not a source of error in the measurement of low resistance?
contact resistance drops at the leads
thermal e.m.f
temperature effect
power dissipation through the circuit
7. Which is the most popular method for measuring low resistance?
ammeter-voltmeter method
potentiometer method
kelvin double bridge method
ducter ohmmeter method
8. How is the contact resistance related to the circuit while measuring a low resistance?
independent of the type of resistance
it is negligible
depends on the e.m.f source
it is very high
9. Kelvin’s bridge consists of _______
double bridge
single bridge
half bridge
three fourth bridge
10. The range of resistance measured in a Kelvin bridge is _____
10Ω to 10 mΩ
1Ω to 10 μΩ
0.01Ω to 10 MΩ
0.1Ω to 10 nΩ
11. Accuracy of Kelvin bridge is of the order of _______
±0.5 to ±2 %
±0.05 to ±0.02 %
±0.05 to ±0.2 %
±0.005 to ±0.02 %
12. What is the effect of load and contact resistance in Kelvin bridge?
independent
fully dependent
partially dependent
depends on the resistance value
13. The relation between ratio of resistance arms and ratio of resistance arms of second bridge is ____
unequal
equal
twice
one forth
14. Why Kelvin bridge is used for measurement of low resistance?
due to e.m.f source used
due to a large current flow
due to contact and lead resistance
due to power dissipation across the circuit
15. What is the condition to achieve a high sensitivity in a Kelvin bridge?
low voltage
high power
medium resistance
high current
16. Kelvin bridge can be calibrated to read ____
inductance and Quality factor value
capacitance only
power and voltage
current and frequency
17. Why can’t a Kelvin bridge be used for the measurement of low Quality factor value?
due to thermoelectric effect
due to balance problem
due to the dull detector used
due to temperature
18. High resistances are of the order of _____
0.1 Mῼ
10 mῼ
1 kῼ
10 Gῼ
19. Megger is a ________
source of e.m.f
source to measure high resistance
type of a null detector
current carrier
20. Megger is also used for _____
providing additional e.m.f
bridge balance
testing insulation resistance
controlling the temperature
21. Megger works on the principle of ______
kirchhoff’s current laws
ohm’s law
gauss’s law
electromagnetic induction
22. The role of the permanent magnet in a megger is to ________
provide field
provide voltage
generate power
balance the circuit
23. A guard ring is provided in a megger to ________
protect the circuit
eliminate error
reduce current flow
limit the temperature rise
24. The supply to the megger is given by ________
ac motor
ac generator
permanent magnet dc motor
dc generator
25. The moving element of the ohmmeter in a megger consists of ______
1 coil
4 coils
3 coils
10 coils
26. The role of the compensating coil in a megger is ________
reduce current
increase voltage
control temperature
scaling
27. Why is the scale of a megger calibrated in megaohms?
to indicate resistance
to minimise the current flow
to increase the voltage drop
to reduce the temperature
28. Megger can be used for verifying the electrical insulation level of _______
passive components such as resistance, capacitor and inductance
devices such as motor, cable, etc
solid state devices
liquid crystal devices
29. Continuity between any two points can be measured using ______
ammeter
voltmeter
megger
galvanometer
30. Electrical continuity between any two points exists if ______
there is current flow through them
there is a wire connecting the points
there is sufficient voltage drop
pointer shows deflection
31. Megger is also known as _____
megohmmeter
multimeter
galvanometer
ammeter
32. The application of a megger is _____
to measure resistance
to test for leakage
to limit the current
to increase the emf of the circuit
33. What is the significance of a megger with respect to high resistance?
it is used to limit the current
it is used to provide stability
used for measuring high resistance with respect to ground
it is used for temperature protection
34. How is the megger calibrated?
in steps of 1 unit per division
based on the value of resistance to be measured
directly calibrated on the position of the pointer
reversely calibrated based on the pointer position
35. What is earthing?
connecting electrical machines to earth
providing a connection to the ground
connecting the electrical machines to source
providing a source of current
36. What is an earth electrode?
electrode that is connected to earth
material used for earthing
electrode connected to the circuit
electrode which is connected to the mains
37. Earth electrode provides _____
high resistance
medium resistance
low resistance
very high resistance
38. How is the condition of an earth electrode measured?
by measuring the voltage
by measuring the current
by measuring the power
by measuring resistance
39. In a three phase system, the neutral is ____
earthed
connected to low voltage
connected to high voltage
not connected
40. Earthing is used as return conductor in telephone lines and for traction work.
True
False
all of the above
None of the mentioned
41. Earthing does not help in protecting the equipment.
True
False
all of the above
None of the mentioned
42. After earthing, the different parts of an electrical machinery are at _____
infinite potential
intermediate potential
zero potential
undefined potential
43. Connection of the various parts of a circuit to earth has a ______
medium resistance
high resistance
very high resistance
very low resistance
44. Specific resistance of soil is _______
changes from soil to soil
is constant
depends on the circuit connected to it
depends on the supply voltage
45. The readings of polar type potentiometer are I = 12.4∠27.5°, V = 31.5∠38.4°. Then, reactance of the coil will be ______
2.51 Ω
2.56 Ω
2.54 Ω
2.59 Ω
46. The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. Find the magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m.
13.04 A
10 A
14.95 A
12.56 A
47. Low resistance is measured by _______
De-Sauty’s bridge
Maxwell’s bridge
Kelvin double bridge
Wein’s bridge
48. The resistance can be measured most accurately by _______
Voltmeter-Ammeter method
Bridge method
Multimeter
Megger
49. A slide wire potentiometer has 10 wires of 2 m each. With the help of a standard voltage source of 1.045 V, it is standardized by keeping the jockey at 104.5 cm. If the resistance of potentiometer wires is 2000 Ω, then the value of working current is?
1 mA
10 mA
0.1 mA
0.5 mA
50. A resistor of 10 kΩ with the tolerance of 5% is connected in parallel with 5 kΩ resistors of 10% tolerance. What is the tolerance limit for a parallel network?
9%
12.4%
8.33%
7.87%
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