question_answer 1)
A man hold both the terminals of a 500 V megger, but still safe due to
A)
high voltage done
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B)
very low current done
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C)
high resistance of the body done
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D)
low resistance of the body done
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question_answer 2)
On testing an electric iron on megger, the reading of the megger is infinity. This indicates
A)
short circuit of the heating element done
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B)
short circuit of the supply terminal done
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C)
loose terminal connections done
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D)
open circuit of the heating element done
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question_answer 3)
Using a C.T. has
A)
poorer overload capacity than a P.T. done
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B)
the same overload capacity as a P.T. done
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C)
a higher overload capacity than a P.T. done
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D)
none of the above done
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question_answer 4)
An alternator is being synchronized to the bus bars of frequency 50 Hz. The synchroscope lamp flickers at a frequency of 5 Hz. The frequency of the alternator is
A)
45 Hz done
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B)
55 Hz done
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C)
45 of 55 Hz done
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D)
none of the above done
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question_answer 5)
Tow voltmeters of\[0-300\,\,V\]range are connected in parallel to an ac circuit. One voltmeter is moving iron type and reads 200 V. If the other volmeter is moving coil type, its reading will be
A)
\[200\sqrt{3}\,\,V\] done
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B)
\[200~\times 1.41\,\,V\] done
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C)
slightly less than 200 V done
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D)
zero done
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question_answer 6)
Which of the following meter mechanisms is adaptable to a greater variety of measurement?
A)
Inclined coil done
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B)
Moving-iron vane done
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C)
Electrodynamometer done
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D)
Permanent magnet-moving coil done
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question_answer 7)
To measure 2 volts, if one selects \[0-100\]volt range voltmeter which is accurate within \[\pm 1%,\]the error in his/her measurement may be up to
A)
\[\pm 0.02%\] done
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B)
\[\pm 1%\] done
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C)
\[\pm 2%\] done
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D)
\[\pm 50%\] done
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question_answer 8)
In a two wattmeter method of measuring power in a 3-phase system one of the watt meters reads negative implying
A)
wattmeter connection is faulty done
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B)
load is unbalanced done
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C)
power flow is in the reverse direction done
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D)
power factor is less then 0.5 done
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question_answer 9)
Which of the following is not an advantage of semi-conductor gauges as compared to conventional strain gauges?
A)
Excellent hysteresis characteristics done
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B)
Least sensitive to temperature changes done
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C)
High fatigue life done
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D)
Smaller size done
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question_answer 10)
In indicating instruments the damping is usually adjusted
A)
at critical value done
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B)
to the value slightly higher than critical value done
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C)
to the value slightly higher than critical value value done
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D)
to any value done
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question_answer 11)
Electrodynamometers are used extensively for the measurement of
A)
magnetic lines of force done
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B)
resistivity done
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C)
capacitor networks done
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D)
power done
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question_answer 12)
Electrostatic instruments
A)
can be used on dc only done
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B)
when used on ac measure rms value whatever the waveform done
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C)
are highly sensitive to eddy current errors done
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D)
none of the above done
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question_answer 13)
Before connecting a meter to measure an unknown current or voltage, it is best to
A)
start with the highest range and work down done
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B)
start with the lowest range and work down done
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C)
select an estimated mid-range done
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D)
use the trial and error method done
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question_answer 14)
Quadrant type electrostatic instruments can be used for measurement of ac voltage
A)
only when heterostatically connected. done
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B)
only when idiostatically connected. done
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C)
in either heterostatic connection or idiostatic connection done
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D)
None of the above done
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question_answer 15)
Capacitor potential transformers are used
A)
for primary voltage exceeding 100kv (Phase) done
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B)
because these are cheaper than the conventional type above a certain voltage done
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C)
for keeping the transformation ratio constant irrespective of the burden with certain adjustments done
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D)
all of the above done
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question_answer 16)
For measuring a low resistance by ammeter-voltmeter method, the voltmeter is connected directly across the resistance under measurement
A)
there is an error in measurement as the ammeter measures current flowing through the voltmeter in addition to the current flowing through the resistance under measurement done
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B)
there is an error in measurement as the voltmeter measures voltage drop across the ammeter in addition to that across the resistance under measurement done
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C)
both [a] and [b] done
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D)
none of above done
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question_answer 17)
The rectifier instrument is not free from
A)
Temperature error done
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B)
Frequency error done
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C)
Wave shape error done
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D)
All of the above done
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question_answer 18)
An accurate ammeter must have a resistance of
A)
High value done
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B)
Low value done
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C)
Very low value done
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D)
None of the above done
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question_answer 19)
The source of energy for operating an ohmmeter is obtained from?
A)
the line being measured done
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B)
any 120 volt source done
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C)
a rectifier cell done
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D)
a battery done
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question_answer 20)
Which of the following is not the method for reducing H residual inductance in resistors?
A)
Faraday's winding method done
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B)
Card wound resistor done
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C)
Chaperon winding method done
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D)
Curtis and Rower winding method done
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question_answer 21)
\[{{W}_{1}}\]and\[{{W}_{2}}\]are the readings of two watt meters used to measure power of a 3-phase balanced load. The reactive power drawn by the load is
A)
\[{{W}_{1}}\]+\[{{W}_{2}}\] done
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B)
\[{{W}_{1}}-{{W}_{2}}\] done
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C)
\[\sqrt{3}\,\,({{W}_{1}}+{{W}_{2}})\] done
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D)
\[\sqrt{3}\,\,({{W}_{1}}-{{W}_{2}})\] done
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question_answer 22)
Half wave rectifier type AC meters are used as voltmeter They cannot be used as ammeters because
A)
pointer would oscillate with AC done
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B)
AC current would be too small to read done
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C)
AC current would be excessive done
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D)
AC is changed to DC done
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question_answer 23)
Which of the following does not have the same units as the others? The symbols have their usual meanings.
A)
\[\frac{L}{R}\] done
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B)
RC done
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C)
\[\sqrt{LC}\] done
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D)
\[\frac{1}{\sqrt{LC}}\] done
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question_answer 24)
The ratio of maximum displacement deviation to full scale deviation of the instrument is called the
A)
static sensitivity done
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B)
accuracy done
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C)
linearity done
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D)
precision done
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E)
dynamic deviation done
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question_answer 25)
Two 200 V D.C. voltmeters having resistances of \[15\,\,k-ohm\]and\[10\text{ }k-ohm\]are connected in series. The safe voltage which can be measured by this combination will be
A)
400 V done
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B)
\[200\sqrt{2}\,V\] done
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C)
200 V done
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D)
100 V done
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question_answer 26)
The Q-meter works on the principle of
A)
mutual inductance done
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B)
self inductance done
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C)
series resonance done
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D)
parallel resonance done
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question_answer 27)
The pressure coil of a dynamometer type wattmeter is
A)
highly inductive done
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B)
highly resistive done
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C)
purely resistive done
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D)
purely inductive done
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question_answer 28)
The bridge method commonly used for finding mutual inductance is
A)
Heavy side Campbell bridge done
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B)
Schering bridge done
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C)
De Sauty bridge done
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D)
Wien bridge done
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question_answer 29)
What is the correct sequence of the following type ammeters and voltmeters with increasing accuracy? 1. Moving-iron 2. Moving-coil permanent magnet 3. Induction Select the correct answer using the codes given below
A)
1, 3, 2 done
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B)
1, 2, 3 done
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C)
3, 1, 2 done
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D)
2, 1, 3 done
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question_answer 30)
Which of the following bridges can be used for inductance measurement? 1. Maxwell's bridge 2 Schering bridge 3. We in-bridge 4.Hay's bridge 5. Wheatstone bridge Select the correct answer using the codes given below
A)
1 and 2 done
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B)
2 and 3 done
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C)
3, 4 and 5 done
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D)
1 and 4 done
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question_answer 31)
Which one of the following digital voltmeters is most suitable to eliminate the effect of period noise?
A)
Ramp type digital voltmeter done
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B)
Integrating type digital voltmeter done
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C)
Successive approximation type digital voltmeter done
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D)
Servo type digital voltmeter done
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question_answer 32)
Electrostatic instruments are normally used for
A)
low current measurements done
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B)
high current measurements done
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C)
low voltage measurements done
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D)
high voltage measurements. done
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question_answer 33)
Which instrument has necessarily the 'square law type
A)
Permanent magnet moving coil. done
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B)
Hot wire instruments done
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C)
Moving iron repulsion done
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D)
None of the above done
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question_answer 34)
In a single-phase power factor meter, the controlling torque is
A)
provided by spring control done
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B)
provided by gravity control done
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C)
provided by stuffiness of suspension done
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D)
not required done
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question_answer 35)
If an induction type energy meter runs fast, it can be slowed down by
A)
at lag adjustment done
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B)
light load adjustment done
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C)
adjusting the position of braking magnet and moving it closer from the centre of the disc done
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D)
adjusting the position of braking magnet and moving it away from the centre of the disc. done
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question_answer 36)
Which one of the following statements is correct? The deflection of hot wire instrument depends on
A)
r. m. s. value of the a. c. current done
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B)
r. m. s. value of the a. c. voltage done
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C)
average value of the a. c. current done
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D)
average value of the a. c. voltage done
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question_answer 37)
Which one of the following decides the time of response of in indicating instrument?
A)
Deflecting system done
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B)
Controlling system done
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C)
Damping system done
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D)
Pivot and Jewel bearing done
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question_answer 38)
Piezoelectric crystal is generally employed for the measurement of which one of the following?
A)
Flow done
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B)
Velocity done
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C)
Acceleration done
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D)
Temperature done
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question_answer 39)
The deflection expression\[\theta \propto {{V}^{2}}=\frac{dc}{d\theta }\]corresponds to
A)
moving iron type instrument done
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B)
electro dynamic type instruments done
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C)
electrostatic type instrument done
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D)
induction type instruments done
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question_answer 40)
The full range of audibility in audio frequency oscillator is
A)
0 to 20 Hz done
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B)
20 Hz to 2 kHz done
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C)
20 Hz to 20 kHz done
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D)
20 Hz to 20 MHz done
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question_answer 41)
Which devices used to measure the temperature of an object?
A)
Potentiometer done
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B)
Odometer done
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C)
Thermometers done
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D)
Galvanometer done
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question_answer 42)
A liquid crystal display requires
A)
An AC drive done
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B)
A DC drive done
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C)
Both AC and DC drive done
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D)
None of the above done
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question_answer 43)
A moving iron frequency meter consists of
A)
Two inductive circuits connected in parallel done
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B)
One inductive and one non inductive circuit connected in parallel done
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C)
Two non inductive circuits connected in parallel done
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D)
One inductive and one non inductive circuit connected in series done
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question_answer 44)
The earth resistance can be measured by
A)
Fall of potential method done
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B)
Using an earth tester done
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C)
Doctor ohmmeter method done
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D)
Only [a] and [b] done
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question_answer 45)
In AC bridges, the Wagner earth devices are used to
A)
Remove all the earth capacitances from the bridge circuit done
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B)
Remove harmonics done
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C)
Reduce error caused by stray electric field done
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D)
All of the above done
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question_answer 46)
Electrostatic voltmeter instruments are suitable for
A)
AC work only done
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B)
DC work only done
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C)
Both AC and DC work done
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D)
None of these done
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question_answer 47)
Electrostatic instruments are generally used as
A)
Voltmeters done
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B)
Ammeters done
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C)
Watt meters done
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D)
Watt-hour meters done
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question_answer 48)
In a measurement system,
A)
A single measurement components may have both random errors and systematic errors done
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B)
A measurement system consists of several components with each component having separate errors done
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C)
Both the statement [a] & [b] are true done
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D)
Neither statement [a] nor statement [b] is true done
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question_answer 49)
Which of the following instruments used for the measurement of pressure?
A)
Bellows done
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B)
Diaphragms done
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C)
Fiber optic pressure sensors done
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D)
All of the above done
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question_answer 50)
The errors mainly caused by human mistakes are
A)
Gross error done
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B)
Instrument error done
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C)
observational error done
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D)
Systematic error done
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