Mock MCQ
INSTRUMENTATION TEST-1
- 1.
A bridge circuit is used for the measurement of the following components:
- A.
Resistance, capacitance and inductance
- B.
Diode, triode and thyristor
- C.
Transistor, thermistor and antenna
- D.
LED, op amp and transducer
Correct Answer
A. Resistance, capacitance and inductance -
- 2.
A simple bridge circuit consists of a network of __________
- A.
3 resistance arms
- B.
2 resistance arms
- C.
4 resistance arms
- D.
6 resistance arms
Correct Answer
C. 4 resistance arms -
- 3.
What is applied to the two opposite junctions of a bridge circuit.
- A.
Source of voltage
- B.
Source of current
- C.
Source of power
- D.
Source of impedance
Correct Answer
B. Source of current -
- 4.
A bridge circuit uses which method of measurement ?
- A.
Absolute
- B.
Relative
- C.
Differential
- D.
Comparison
Correct Answer
D. Comparison -
- 5.
The principle on which a bridge circuit operates is
- A.
Null indication
- B.
Ampere’s rule
- C.
Partial indication
- D.
Kirchhoff’s laws
Correct Answer
A. Null indication -
- 6.
The accuracy of a bridge depends on the _________
- A.
Null indicator
- B.
Bridge components
- C.
Current source
- D.
Voltage source
Correct Answer
B. Bridge components -
- 7.
When is the bridge circuit balanced ?
- A.
When voltage is applied
- B.
When current flows through the opposite ends of the bridge circuit
- C.
When no current flows through the galvanometer
- D.
When impedance is minimum
Correct Answer
C. When no current flows through the galvanometer -
- 8.
Relationship at balance condition between the component values of the four arms of a bridge is known as
- A.
Full load condition
- B.
Open circuit condition
- C.
Short circuit condition
- D.
Balancing condition
Correct Answer
D. Balancing condition -
- 9.
D.C. bridges are used for _________
- A.
Measurement of resistance
- B.
Measurement of capacitance
- C.
Measurement of current
- D.
Measurement of inductance
Correct Answer
A. Measurement of resistance -
- 10.
What is used to characterise single port devices, multiport devices etc?
- A.
Current values
- B.
Impedance values
- C.
Voltage values
- D.
Power values
Correct Answer
B. Impedance values -
- 11.
Kelvin’s bridge consists of _________
- A.
Double bridge
- B.
Single bridge
- C.
Half bridge
- D.
Three fourth bridge
Correct Answer
A. Double bridge -
- 12.
The range of resistance measured in a Kelvin bridge is _________
- A.
10Ω to 10 mΩ
- B.
1Ω to 10 μΩ
- C.
0.01Ω to 10 MΩ
- D.
0.1Ω to 10 nΩ
Correct Answer
B. 1Ω to 10 μΩ -
- 13.
Accuracy of Kelvin bridge is of the order of _________
- A.
±0.5 to ±2 %
- B.
±0.05 to ±0.02 %
- C.
±0.05 to ±0.2 %
- D.
±0.005 to ±0.02 %
Correct Answer
C. ±0.05 to ±0.2 % -
- 14.
What is the effect of load and contact resistance in Kelvin bridge?
- A.
Independent
- B.
Fully dependent
- C.
Partially dependent
- D.
Depends on the resistance value
Correct Answer
A. Independent -
- 15.
The relation between ratio of resistance arms and ratio of resistance arms of second bridge is
- A.
Unequal
- B.
Equal
- C.
Twice
- D.
One forth
Correct Answer
B. Equal -
- 16.
Why Kelvin bridge is used for measurement of low resistance?
- A.
Due to e.m.f source used
- B.
Due to a large current flow
- C.
Due to contact and lead resistance
- D.
Due to power dissipation across the circuit
Correct Answer
C. Due to contact and lead resistance -
- 17.
What is the condition to achieve a high sensitivity in a Kelvin bridge?
- A.
Low voltage
- B.
High power
- C.
Medium resistance
- D.
High current
Correct Answer
D. High current -
- 18.
Kelvin bridge can be calibrated to read
- A.
Inductance and Quality factor value
- B.
Capacitance only
- C.
Power and voltage
- D.
Current and frequency
Correct Answer
A. Inductance and Quality factor value -
- 19.
Why can’t a Kelvin bridge be used for the measurement of low Quality factor value?
- A.
Due to thermoelectric effect
- B.
Due to balance problem
- C.
Due to the dull detector used
- D.
Due to temperature
Correct Answer
B. Due to balance problem -
- 20.
Power is ___________
- A.
Rate of doing work
- B.
Rate of producing voltage
- C.
Rate of generating current
- D.
Rate of overcoming friction
Correct Answer
A. Rate of doing work -
- 21.
In A.C. circuits, power consumed is ________
- A.
Product of voltage and current
- B.
It depends on the p.f. of the circuit in addition to voltage and current
- C.
It depends on the supply voltage
- D.
It depends on the magnitude of the circuit current
Correct Answer
B. It depends on the p.f. of the circuit in addition to voltage and current -
- 22.
In D.C. circuits, power is measured using ________
- A.
Ohmmeter and galvanometer
- B.
Ohmmeter and voltmeter
- C.
Ammeter and voltmeter
- D.
Ammeter and galvanometer
Correct Answer
C. Ammeter and voltmeter -
- 23.
In A.C. circuits, power is measured using
- A.
Voltmeter
- B.
Ammeter
- C.
Ohmmeter
- D.
Wattmeter
Correct Answer
D. Wattmeter -
- 24.
A dynamometer type wattmeter consists of ________
- A.
Only potential coil
- B.
Potential and current coils
- C.
Only current coil
- D.
No coils
Correct Answer
B. Potential and current coils -
- 25.
In a Dynamometer type wattmeter, the fixed coil is split into ________
- A.
4
- B.
3
- C.
2
- D.
1
Correct Answer
C. 2 -
- 26.
When a current carrying coil is placed in the magnetic field.
- A.
No force is exerted
- B.
Voltage is produced
- C.
Power is generated
- D.
A force is exerted
Correct Answer
D. A force is exerted -
- 27.
When the moving coil in a Dynamometer type wattmeter deflects
- A.
Pointer moves
- B.
Pointer doesn’t move
- C.
Current flows
- D.
Voltage is generated
Correct Answer
A. Pointer moves -
- 28.
Maxwell inductance capacitance bridge can be used for _________
- A.
Measurement of inductance
- B.
Measurement of capacitance and inductance
- C.
Measurement of resistance
- D.
Measurement of voltage and current
Correct Answer
A. Measurement of inductance -
- 29.
Balance equation for computing the value of the unknown inductance is
- A.
Lx = R2 R3
- B.
Lx = R2 C1
- C.
Lx = R2 R3 C1
- D.
Lx = R3 C1
Correct Answer
C. Lx = R2 R3 C1 -
- 30.
Quality factor of the circuit is given by _________
- A.
Q = ωC1
- B.
Q = ωR1
- C.
Q = ω
- D.
Q = ωR1 C1
Correct Answer
D. Q = ωR1 C1 -
- 31.
What is the significance of capacitors in a Maxwell bridge?
- A.
They are used to block dc
- B.
They are used to block ac
- C.
They are cheap
- D.
They are expensive
Correct Answer
C. They are cheap -
- 32.
The bridge balance equation can be written in _________
- A.
Impedance form
- B.
Resistance form
- C.
Conductance form
- D.
Admittance form
Correct Answer
D. Admittance form -
- 33.
In the simplest form, an AC bridge consists of ____________
- A.
Arms, source and a detector
- B.
Arms and source
- C.
Source and detector
- D.
Arms and detector
Correct Answer
A. Arms, source and a detector -
- 34.
Source is ________
- A.
Dc supply
- B.
Ac supply
- C.
Mixed mode supply
- D.
High voltage supply
Correct Answer
B. Ac supply -
- 35.
At high frequency, source consists of ________
- A.
Amplifiers
- B.
Regulators
- C.
Oscillators
- D.
Op amps
Correct Answer
C. Oscillators -
- 36.
What is the frequency range for a headphone as a detector?
- A.
20 Hz to 20 kHz
- B.
10 kHz to 1 MHz
- C.
10 MHz to 1 GHz
- D.
250 Hz to 4 kHz
Correct Answer
D. 250 Hz to 4 kHz -
- 37.
For single frequency value, the most sensitive detector is ________
- A.
Tuned detector
- B.
Vibration galvanometer
- C.
Headphone
- D.
Oscillator
Correct Answer
A. Tuned detector -
- 38.
Tuned detectors are used in the frequency range of ________
- A.
1 Hz to 100 Hz
- B.
10 Hz to 100 Hz
- C.
1 kHz to 100 kHz
- D.
1 MHz to 100 MHz
Correct Answer
B. 10 Hz to 100 Hz -
- 39.
Vibration galvanometers are used for ________
- A.
Very high frequency
- B.
Very low frequency
- C.
Low audio frequency
- D.
High audio frequency
Correct Answer
C. Low audio frequency -
- 40.
AC bridge is an outcome of ________
- A.
Kelvin bridge
- B.
Megger
- C.
De Sauty bridge
- D.
Wheatstone bridge
Correct Answer
D. Wheatstone bridge -
- 41.
Wheatstone bridge is a __________
- A.
A.c. bridge
- B.
D.c. bridge
- C.
High voltage bridge
- D.
Power dissipation bridge
Correct Answer
B. D.c. bridge -
- 42.
Wheatstone bridge is used to measure resistance in the range of ________
- A.
1Ω to a few megaohms
- B.
10kΩ to a few megaohms
- C.
100MΩ to a few gegaohms
- D.
100Ω to a few teraohms
Correct Answer
A. 1Ω to a few megaohms -
- 43.
Wheatstone bridge is used to measure the d.c. resistance of various types of wires for
- A.
Determining their effective resistance
- B.
Computing the power dissipation
- C.
Quality control of wire
- D.
Maintaining a source of constant e.m.f
Correct Answer
C. Quality control of wire -
- 44.
Telephone companies make use of the Wheatstone bridge for _________
- A.
Measuring the telephone resistance
- B.
Computing the line strength
- C.
Maintaining dialtone
- D.
Locating the cable faults
Correct Answer
D. Locating the cable faults -
- 45.
The types of faults in a telephone line are ________
- A.
Line to line or line to ground
- B.
Triple line to line or line to ground
- C.
Open circuit and short circuit
- D.
Symmetrical and unsymmetrical
Correct Answer
A. Line to line or line to ground -
- 46.
How can a Wheatstone bridge be used for the measurement of physical parameters?
- A.
In conjunction with a rectifier
- B.
Along with an op amp
- C.
By connecting it to a thermistor
- D.
By making use of a transducer
Correct Answer
B. Along with an op amp -
- 47.
By using the variations on a Wheatstone bridge we can
- A.
Measure quantities such as voltage, current and power
- B.
Measure high resistance values
- C.
Measure quantities such as complex power
- D.
Measure quantities such as capacitance, inductance and impedance
Correct Answer
D. Measure quantities such as capacitance, inductance and impedance -
- 48.
One of the simplest applications of a Wheatstone bridge is ________
- A.
Voltage measurement
- B.
Current measurement
- C.
Light measurement
- D.
Power measurement
Correct Answer
C. Light measurement -
- 49.
Thermal compensation can be provided in a Wheatstone bridge by ________
- A.
Using more than one resistive sensor
- B.
Making use of a heat sink
- C.
Using cooling fans
- D.
Immersing the circuit into a liquid
Correct Answer
A. Using more than one resistive sensor -
- 50.
Anderson bridge is used for ________
- A.
The measurement of self-inductance
- B.
The measurement of resistance
- C.
The measurement of capacitance
- D.
the measurement of impedance
Correct Answer
A. The measurement of self-inductance -
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Current Version
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Oct 30, 2018Quiz Edited by
ProProfs Editorial Team -
Oct 30, 2018Quiz Created by
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