# A thermistor exhibits

1.  only a negative change of resistance with increase in temperature

2.  Only a positive change of resistance with increases in temperature

3.  can exhibit either a negative or positive change of resistance with increase of temperature depending upon the type of Material

4.  none of these

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can exhibit either a negative or positive change of resistance with increase of temperature depending upon the type of Material

Explanation :
No Explanation available for this question

# A 35 V d.c. supply is connected across a combined resistance of 600 ohms and an unknown resistance of R ohms in series. A voltmeter having a resistance of 1.2 kW is connected across'600 ohm resistor and reads 5 V. The resistance R will be

1.  120ohms

2.  500 ohms

3.  1.7k ohms

4.  2.4 k ohms

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2.4 k ohms

Explanation :
No Explanation available for this question

# The insulation of the modern EIIV lines is designed based on

1.  the lighting voltage

2.  the switching voltage

3.  Corona

4.  RI

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the switching voltage

Explanation :
No Explanation available for this question

# If the practical units of voltage and current wave each made 20 times as large as they are at present, what would be the consequent alteration in the size of the unit of capacitance

1.  200 times

2.  60 times

3.  20 times

4.  Nil

4

Nil

Explanation :
No Explanation available for this question

# A thermo-coupIe ammeter gives full-scale deflection of 10A. when it reads one fifth of the scale, the current will be

1.  2 A

2.  4 A

3.  4.47 A

4.  5.78 A

4

4.47 A

Explanation :
No Explanation available for this question

# The rate of rise of restricting voltage depends upon the

1.  type of circuit breaker

2.  inductance of the system only

3.  capacitance of the system only

4.  inductance and capacitance of the system

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inductance and capacitance of the system

Explanation :
No Explanation available for this question

# Ratio of the readings of two watt meters connected to measure power in a balanced 3-phase load is 5 : 3 and the load is inductive. The power factor at load is

2.  0.917 lag

4.  0.6 lag

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0.917 lag

Explanation :
No Explanation available for this question

# A basic d'Arsonval movement with internal resistance 100Ω and full scale current 1 mA is to be converted into a multirange de voltmeter with voltage ranges 0 - 10V, 0-30 V, 0 - 100 V and 0 - 300 V. The circuit arrangement is shown in the figure. The value of R1 will be

1.  0.0Ω

2.  100Ω

3.  9.9kΩ

4.  10kΩ

4

9.9kΩ

Explanation :
No Explanation available for this question

# Rectifier moving coil, instruments respond to

1.  peak value, irrespective of the nature of the wave form

2.  average value for all wave forms

3.  rms value for all wave forms

4.  rms value for symmetrical square wave form

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average value for all wave forms

Explanation :
No Explanation available for this question

1.  0.25A

2.  0.50A

3.  0.67A

4.  0.707A

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