Important Paper ESE Electrical Engineering

1. The reliability of an instrument refers to
a. The measurement of changes due to temperature variation
b. The degree to which repeatability continues to remain within specified limits
c. The life of an instrument
d. The extent to which the characteristics remain linear 
Answer: (b)
2. In an electrodynamometer wattmeter
a. The fixed coils providing magnetic flux are connected across the power line
b. The compensated wattmeter improves its accuracy by using windings with opposite currents with respect to series windings
c. If the full-scale power measured is 100W, then the half-scale power will be 10W
d. It can measure a.c. power but is unsuitable for d.c. power 
Answer: (b)
3. The problems of the binary-weighted resistor digital-to-analog convertor (DAC) can be overcome by using
a. An 8-bit binary-weighted resistor DAC
b. A flash DAC
c. An R/2R ladder DAC
d. A staircase DAC 
Answer: (c)
4. Phase lead compensation
a. Increases bandwidth and increases steady-state error
b. decreases bandwidth and decreases steady-state error
c. will not affect bandwidth decreases steady-state error
d. Increases bandwidth but will not affect steady-state error 
Answer: (d)
5. Frequency counter can be used to measure
1. Fundamental frequency of input signal
2. Fundamental and harmonic frequencies of input signal
3. Time interval between two pulses
4. Pulse width 
Which of the above statements are correct?
a. 1, 2, 3 and 4
b. 1, 2 and 3 only
c. 2, 3 and 4 only
d. 1, 3 and 4 only 
Answer: (d)
6. In vector impedance meter, the coverage of the instrument can be obtained with
a. V-I characteristics of the test system
b. Power-frequency plot
c. Sweep frequency plots of impedance and phase angle versus frequency
d. voltage-angle plot 
Answer: (c)
7. A 1mA galvanometer with internal resistance of 50 Ω is to be converted to measure 5 A (full-scale). What is the value of the shunt resistance required for this conversion?
a. 1 Ω
b. 0.01 Ω
c. 1 kΩ
d. 10 Ω 
Answer: (b)
8. A 50 basic d’Arsonval movement with an internal resistance of 500 Ω is to be used as a voltmeter. The value of the multiplier resistance required to measure a full-scale voltage range of 0-5 volts is
a. 999.5 kΩ
b. 99.5 kΩ
c. 9.99 kΩ
d. 0.99 kΩ
Answer: (b)
9. The maximum power demand of a consumer is 2 kW and the corresponding daily energy consumption is 30 units. What is the corresponding load factor?
a. 0.25
b. 0.5
c. 0.625
d. 0.75 
Answer: (c)
10. Time response of an indicating instrument is decided by which of the following systems?
a. Mechanical system provided by pivot and jewel bearing
b. Controlling system
c. Deflecting system
d. Damping system 
Answer: (d)
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