In a ballistic galvanometer, a charge ofμC gives a first swing of 25°. The charge required to cause first swing ofis
200 μC
400 μC
50 μC
25 μC
Q.2.
As per BIS there are 6 accuracy classes of instruments.
True
False
Q.3.
Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.Reason (R): A wattmeter measures apparent power.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Q.4.
An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through again amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
0.1 V/mm
0.5 V/mm
1 V/mm
5 V/mm
Q.5.
A piezoelectric force transducer has a charge sensitivity ofpC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier ismV/N. The gain of amplifier is
1 mV/pC
1.5 mV/pC
2.5 mV/pC
4 mV/pC
Q.6.
A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-A range, the resistance of shunt should be
0.6 Ω
0.06 Ω
0.1 Ω
0.004 Ω
Q.7.
Which of the following voltmeters would you use for measuring voltage acrosskΩ resistance?
Voltmeter having a resistance of 5 kΩ
Voltmeter having a sensitivity of 1 kW/V
Voltmeter having sensitivity of 10 kW/V
None of the above
Q.8.
If reference sound pressure P0 is 2 x 10-5 N/ma sound pressure ofdB is equal to
0.632 N/m2
0.707 N/m2
0.835 N/m2
0.925 N/m2
Q.9.
Assertion (A): De sauty's bridge is suitable only for pure capacitor.Reason (R): Capacitors are mostly perfect.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Q.10.
In which of the transformer is the secondary nearly short circuited under normal operating conditions?
CT
PT
Distribution transformer
Power transformer
Q.11.
A single phase energy meter has the ratingresolutions/ kWh. If aW electric gadget is used for 4 hours, the energy meter will make
1200 revolutions
1800 revolutions
2100 revolutions
2400 revolutions
Q.12.
In a CRO which of the following is not a part of electron gun
cathode
grid
accelerating anode
X - Y plates
Q.13.
To increase Q factor of a coil, the wire should be
long
thin
thick
long and thin
Q.14.
An ammeter of 0-A range has a guaranteed accuracy ofof full scale reading. The current measured is 5 A. The limiting error is
2%
2.5%
4%
5%
Q.15.
In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is
1
0.5
0
0.8
Q.16.
The coil of a moving iron instrument has a resistance ofΩ and an inductance of 1 H. It readsV when aV dc is applied. If series resistance isΩ, its reading when fed byV,Hz ac will be
260 V
252 V
250 V
248 V
Q.17.
Which of the following instruments can be used to measure AC current only?
Permanent Magnet Type ammeter
Induction type ammeter
Moving iron voltmeter
Moving iron ammeter
Q.18.
The thermocouple instrument will measure
Current
Voltage
Flux
None of the above
Q.19.
The thermocouple instruments do not have
High sensitivity
Absence of frequency error
Independence of ambient temperature
High degree of measuring accuracy
Q.20.
Wien bridge is useful for measuring
Very high frequency
Low frequency
Medium frequency
High frequency
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