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1
Which one ofthe following instruments is used for the standardisation of a Drysdale
A.C. potentiometer?
A
Rectfier type ammeter
B
PMMC ammeter
C
Prrecision type electrodynamometer
D
Thermocouple ammeter
2
Match the two lists and choose the correct answer from the code given below:
List-I List-II
(w) Digital Counter (i) Measurement of harmonics
(x) Schering bridge ii) Measurement of frequency
(y) Megger (iii) Measurement of loss angle in a dielectric
(z) Spectrum Analyzer (iv) Measurement of insulation resistance
Choose the correct option
A
(w)-(iv), (x)-(iii), (y)-(ii),(z)-(i)
B
(w)- (ii), (x)-(iii), (y)-(iv), (z)-(i)
C
(w)-(iv), (x)-(i), (y)-(ii), (z)-(iii)
D
(w)-(ii), (x)-(iii), (y)-(i), (z)-(iv)
3
The bridges suitable for the measurement of an unknown inductance in terms of a known
capacitance are:
A
Maxwell and schering
B
Hay and Schering
C
Maxwell and Hay
D
Maxwell, Hay and Schering
4
What is the most important characteristic of a null detector used in bridge measurements?
I. Accuracy
II. Precision
III. Sensitivity
Select the correct answer using the code given below:
A
Only III
B
Only II and III
C
Only I and III
D
Only II
5
In the De Sauty bridge (unmodified form), it is possible to obtain a balance_.
A
Only if both the capacitors are perfect (lossless)
B
Even if both the capacitors are imperfect (lossy)
C
If one of the capacitors is perfect (lossless)
D
All of the above
6
In a balanced 3-phase 200 V circuit, the line current is 115.5 A. When the power is
measured by the two wattmeter methods, one of the wattmeters reads 20 kW and the
other one reads zero. What is the power factor of the load?
A
0.4
B
0.7
C
0.8
D
0.5
7
In an induction-type energy meter, the steady speed attained by the rotating disc is
I. Proportional to the deflection torque
II. Proportional to the resistance of the path of eddy currents
III. Inversely proportional to the effective radius of the disc from its axis
IV. Inversely proportional to the's quare of brake magnet flux
Which of the above is/are correct?
A
I, II and III only
B
I, II, III and IV
C
I, II and IV only
D
II,III and IV only
8
An electronic voltmeter gives more accurate readings in high resistance circuits as
compared to a non-electronic voltmeter because of its
A
Low Meter resistance
B
High V/kΩ rating
C
High kΩ/V rating
D
High Resolution
9
A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical
tangencies. The frequency of the horizontal input is 1000 Hz. What is the frequency of
the vertical input?
A
2500 Hz
B
1400 Hz
C
1050 Hz
D
5000 Hz
10
Match the two lists and choose the correct answer from the code given below:
List-I (Parameter) List-II (Transducer)
(w) Pressure (i) Thermistor
(x) Temperature ii) Piezoelectric crystal
(y) Displacement (iii) Capacitance transducer s strain gauge
(z) Stress (iv) Resistance
Choose the correct option-
A
(w)-(ii), (x)-(i),(y)-(iii), (z)-(iv)
B
(w)-(iv), (x)-(iii), (y)-(ii), (z)-(i)
C
(w)-(i),(x)-(iii), (y)-(ii), (z)-(iv)
D
(w)-(iv), (x)-(ii), (y)-(iii), (z)-(i)