Electrical measurement comprises different devices, methods and mathematical expressions to evaluate electrical quantities and units. It deals in the measurement of various electrical entities such as current, voltage, resistance, capacitance etc. Properties are converted into electrical signals and waves, which are further measured and recorded using different instruments such as ammeter, voltmeter, galvanometer etc either in analog or digital form.
Question 1: D.C bridges are used for the measurement of _________.
a) capacitance b) current
c) resistance d) voltage
Explanation: Resistance measurements are used
Question 2: __________ and _________ are connected between the two ends of Wheatstone bridge.
a) Ohmmeter, galvanometer b) Ammeter, voltmeter
c) Ammeter, galvanometer d) Galvanometer, battery
Answer: Galvanometer, battery
Explanation: Galvanometer is connected between opposite
Question 3: Which of the following is the correct condition for a balanced wheatstone bridge?
Explanation: The balanced condition of a wheatstone bridge is determined by the ratio of resistor R1 and R2
Question 4: ___________ is source at very low frequency in an A.C. bridge.
a) Electromotive force b) Power line
c) Ammeter d) Galvanometer
Answer: Power line
Explanation: The power line acts as a source of supply
Question 5: High current and high voltages are measured by __________ and _________ respectively.
a) current transformer, potential transformer b) potential transformer, current transformer
c) primary transformer, secondary transformer d) none of these
Answer: current transformer, potential transformer
Explanation: Current transformer and potential transformer are used with A.C. ammeter and voltmeter
Question 6: Which of the following is a correct expression for a current transformer’s turns ratio?
Explanation: Turn ratio for the current transformer is the ratio
Question 7: ______________ is used to obtain a high range of electronic voltmeter in a D.C.
a) Transducer b) Resistor
c) Attenuator d) Transformer
Explanation: Attenuator reduces the power of the signal and gets a high range of values
Question 8: Physical changes are sensed by ____________.
a) Electrical transducer b) Mechanical transducer
c) Both (a) and (b) d) None of these
Answer: Mechanical transducer
Explanation: Mechanical transducer delivers physical
Question 9: In an oscilloscope, an electron beam is deflected in _________ directions.
a) one b) two
c) three d) four
Explanation: The electron beam is deflected in two directions
Question 10: IC chips on digital voltmeter are used to ___________.
a) reduce the cost b) increase the size
c) increase the resistance d) increase the cost
Answer: reduce the cost
Explanation: Due to its very compact nature, size and power needed in digital voltmeter