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- What should be the internal resistance of a practical voltmeter? Ans : Very high
- What should be the internal resistance of a ideal voltmeter? Ans : Infinity
- What should be the internal resistance of a practical ammeter? Ans : Very low
- What should be the internal resistance of a ideal ammeter? Ans : Zero
- Voltmeter should be connected in ____ with load? Ans : Parallel or shunt
- Ammeter should be connected in ____ with load? Ans : Series
- How many coils are there in a Wattmeter? Ans : 2, Current coil and Pressure or Voltage coil
- How many terminals are there in a Wattmeter? Ans : 4, M (Main line), C (Common), L (Load), V (Voltage or Neutral)
- What is multiplying factor of Wattmeter? Ans : It is the ratio of (Voltage range X Current range) / full scale deflection of the wattmeter.
- Which kind resistive load you have used in experiment? Ans : Rheostat and Incandescent Lamp
- What is Variac? Ans: It is an Auto-transformer, which is used to get variable ac voltage from 0 to 270 Volt.
- SI unit of Power? Ans : Watt
- SI unit of Voltage? Ans : Volt
- SI unit of Current? Ans : Ampere
- SI unit of power factor? Ans : Unitless
- SI unit of frequency? Ans : Hertz
- SI unit of resistance, inductive reactance, capacitive reactance, impedance? Ans : Ohm
- SI unit of inductance? Ans : Henry
- SI unit of capacitance? Ans : Farad
- What is power factor? Ans : It is the ratio of active power (VIcos phi) to the apparent power (VI) or we can say, it is the ratio of kW/kVA or it is the ratio of resistance (R) to the impedance (Z)
- What is the power factor of Inductive load? Ans : Lagging
- What is the power factor of Capacitive load? Ans : Leading
- What is the power factor of Resistive load? Ans : Unity
- How many terminals are there in a Power factor meter? Ans : 4, M (Main line), C (Common), L (Load), V (Voltage or Neutral)
- What is the range of a power factor meter? Ans : 0.5 lag to unity to 0.5 lead
- What kind of inductive load you have used in experiment? Ans : Choke of Fluorescent Tube
- Which parts you have seen in a transformer? Ans : Laminated core, Primary winding, Secondary winding, terminals
- Why the core is laminated? Ans : To reduce eddy current loss
- Core is made of which material and why? Ans : Silicon Steel, to reduce hysteresis loss
- What is primary winding? Ans : The winding, which is connected with input power supply.
- What is secondary winding? Ans : The winding, from where we take output power.
- On which principle a transformer works? Ans : Mutual induction
- What is transformation ratio? Ans : It is the ratio of secondary voltage to primary voltage or secondary number of turns to the primary number of turns or primary current to the secondary current
- What colors can be found in an 1 ohm resistor? Ans : Brown, Black, Golden and Golden or Silver as per tolerance
- What colors can be found in an 100 +- 5% ohm resistor? Ans : Brown, Black, Brown and Golden
- What is tolerance? Ans : It is the limit of a resistor, that the value of the resistor may vary.
- What is forward bias of a diode? Ans : If the +ve terminal or anode of a diode is connected with +ve side of souce and cathod or -ve terminal of the diode is connected with -ve side of the souce, then the bias is, forward bias.
- What is reverse bias of a diode? Ans : If the +ve terminal or anode of a diode is connected with -ve side of souce and cathod or -ve terminal of the diode is connected with +ve side of the souce, then the bias is, reverse bias.
- How do you identify the terminals of a diode? Ans : By looking at the silver ring. The side of silver ring indicates the cathod (-ve) terminal and the the other side indicates the anode (+ve) terminal.
- What is the knee voltage of silicon diode and germanium diode? Ans : 0.7 V for silicon diode and 0.3 V for germanium diode.
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Most asking Questions of Viva .Every polytechnic students are essential for these Questions.