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Electrical Measurement MCQ Question Set 1
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1. Accuracy of bridge circuit depends on _____
component values
null detector
voltage source
current source
2. What happens to the balance condition, if the source and detector are interchanged?
increases by a factor of 2
reduces to half
remains unchanged
independent of the type of source and detector
3. The simplest type of bridge used for the measurement of medium resistances is known as ______
Kelvin
Schering
Anderson
Wheatstone
4. How is the measurement accuracy in a bridge circuit?
high
low
medium
inaccurate
5. The bridge circuit can be used in _______
high voltage circuits
low power circuits
control circuits
digital integrated circuits
6. Commonly used D.C. bridges are ____
Schering and Anderson
Maxwell inductance and capacitance
DeSauty and Wagner
Wheatstone and Kelvin
7. In control applications, one arm of the bridge circuit contains a _____
capacitive element
resistive element
inductive element
impedance element
8. What are the physical parameters that are to be controlled when a bridge is used in control applications?
area and volume
mass and weight
pressure and temperature
current and voltage
9. Wheatstone bridge consists of ______
4 resistive arms
2 resistive arms
6 resistive arms
8 resistive arms
10. A galvanometer is used as a _____
current source
voltage source
null detector
input impedance
11. The opposite two ends of a Wheatstone bridge consist of ____
voltage and current source
e.m.f and null detector
resistance and capacitance
inductance and impedance
12. The arms consisting of the resistances R1 and R2 are called _____
resistance arms
impedance arms
source arms
ratio arms
13. The arm consisting of the standard known resistance R3 is known as _______
standard arm
resistance arm
accurate arm
known arm
14. Resistance R4 is known as _______
standard resistance
unknown resistance to be measured
resistance arm
input resistance
15. What is connected between the two ends of a Wheatstone bridge?
current and voltage source
ammeter and voltmeter
battery and galvanometer
ohmmeter and wattmeter
16. Wheatstone bridge works on the principle of _____
full deflection
partial deflection
no deflection
null deflection
17. The balance condition of a Wheatstone bridge depends on the _____
ratio of arms R1 and R1
ratio of arms R3 and R4
emf source and null detector
current source and power source
18. Balance condition can be obtained by _______
varying the standard resistance R3
varying the resistance arms R1 and R2
keeping the unknown resistance R4 constant
by making use of a null detector
19. When the bridge is balanced, what is the current flowing through the galvanometer?
0
depends on the ratio arms R1 and R2
varies by a factor of 2
depends on the type of null detector used
20. Amount of deflection of the galvanometer depends on ______
resistance of the ratio arms
sensitivity
current flowing through the bridge
emf across the circuit
21. Sensitivity is defined as _____
amount of voltage per unit current
amount of power per unit voltage
amount of resistance per unit voltage
amount of deflection per unit current
22. Sensitivity is expressed in ____
cm/A
m/mA
mm/µA
inch/nA
23. What is the relation between the sensitivity and deflection for a galvanometer?
directly proportional
inversely proportional
independant of each other
depends on the type of galvanometer used
24. The voltage sensitivity of a galvanometer is given by ______
Sv = e⁄θ
Sv = θ⁄e
Sv = 1⁄e
Sv = 1⁄θ
25. Unit of voltage sensitivity is ______
volts per degrees
amps per ohms
degrees per volts
watts per amps
26. The Wheatstone bridge is used for the measurement of ______
1ῼ to a few megaohms
1kῼ to a few megaohms
1Mῼ to a few gigaohms
1mῼ to a few ohms
27. The source of error in a Wheatstone bridge is due to _____
range of galvanometer used
type of the source of emf used
limiting errors of the three known resistances
balance condition
28. What is the main source of error in a null detector?
lower current detection ability
insufficient sensitivity of the null detector
wiring resistance
power dissipation
29. When current passes through the resistances in the Wheatstone bridge what happens?
voltage drop occurs
null detector burns
back emf is induced
temperature increases due to power dissipation
30. What is the effect of the increase in temperature on the resistance elements?
directly proportional
independent
inversely proportional
changes by a factor of 10
31. Heating effect in the Wheatstone bridge can be avoided by ______
using an expensive emf source
limiting current to a safe value
using heating sinks
immersing the setup in ice
32. The main error when measuring low resistances is _____
power dissipation of the arms
voltage drop across the emf source
lead and contact resistance
current flowing through the circuit
33. How is thermal emf generated?
when current flows
when voltage is applied
when the null detector is connected
when dissimilar metals come in contact
34. Thermal emf can be prevented by _______
using more sensitive galvanometers
using similar metals
by separating the dissimilar metals
reducing the supply emf
35. Wheatstone bridge is a ________
a.c. bridge
d.c. bridge
high voltage bridge
power dissipation bridge
36. Wheatstone bridge is used to measure resistance in the range of _____
1Ω to a few megaohms
10kΩ to a few megaohms
100MΩ to a few gegaohms
100Ω to a few teraohms
37. Wheatstone bridge is used to measure the d.c. resistance of various types of wires for _____
determining their effective resistance
computing the power dissipation
quality control of wire
maintaining a source of constant e.m.f
38. Telephone companies make use of the Wheatstone bridge for ______
measuring the telephone resistance
computing the line strength
maintaining dialtone
locating the cable faults
39. The types of faults in a telephone line are ________
line to line or line to ground
triple line to line or line to ground
open circuit and short circuit
symmetrical and unsymmetrical
40. How can a Wheatstone bridge be used for the measurement of physical parameters?
in conjunction with a rectifier
along with an op amp
by connecting it to a thermistor
by making use of a transducer
41. By using the variations on a Wheatstone bridge we can _______
measure quantities such as voltage, current and power
measure high resistance values
measure quantities such as complex power
measure quantities such as capacitance, inductance and impedance
42. One of the simplest applications of a Wheatstone bridge is _____
voltage measurement
current measurement
light measurement
power measurement
43. Thermal compensation can be provided in a Wheatstone bridge by ____
using more than one resistive sensor
making use of a heat sink
using cooling fans
immersing the circuit into a liquid
44. Wheatstone bridge can’t be used for measurement of _____
high resistance
medium resistance
low resistance
accurate resistance
45. Cost of maintenance of Wheatstone bridge is ______
low
high
depends on the components
depends on the source e.m.f
46. What is the effect of galvanometer on measurement of high resistance?
no effect
depends on the e.m.f source
galvanometer becomes insensitive to an imbalance
depends on the type of galvanometer used
47. What is the effect of heat on the resistances in a Wheatstone bridge?
no effect
increases the voltage drop across the circuit
decreases the current flowing through the circuit
causes a permanent change in the resistance values
48. Effect of high dc on Wheatstone bridge.
no effect
not susceptible
burns the circuit
increases the temperature
49. A Wheatstone bridge may not give accurate readings if _______
t is not balanced
it is balanced
the voltage drop across the circuit is maximum
excessive current flows through the circuit
50. What is the effect of lead wires on the Wheatstone bridge?
no effect
stabilizes the system
desensitizes the system
increases the resistance of the circuit
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