# Practice Test: Question Set - 01

**1. In which condition resonance will occur in R-LC series circuit?**

- (A) Inductive
reactance (X

_{L}) is zero

- (B) Inductive
reactance (X

_{L}) is equal to capacitive reactance (X

_{C})

- (C) Inductive
reactance (X

_{L}) is greater than capacitive reactance (X

_{C})

- (D) Inductive
reactance (X

_{L}) is less than capacitive reactance (X

_{C})

**2. What will be the readings of two watt meters (W1& W2) in 3 phase power measurement, if the power factor is zero?**

- (A) W1
& W2 both are positive reading

- (B) W1
is Positive and W2 is negative reading

- (C) W1
is equal to W2 but with opposite signs

- (D) Zero
W1 is Positive reading, and W2 is negative reading

**3. Calculate the value admittance (Y) of the RLC parallel circuit connected across 240volts/50Hz AC supply and 8 Amp. Current is passed through it?**

- (A) 3.33
Mho

- (B) 0.33
Mho

- (C) 0.033
Mho

- (D) 0.003
Mho

**4. What is the line voltage in 3 phase system if the phase voltage is 240V?**

- (A) 380 Volt

- (B) 400
Volt

- (C) 415 Volt

- (D) 440
Volt

**5. Which quantity is rotating at a constant angular velocity?**

- (A) Scalar
quantity

- (B) Vector
quantity

- (C) Phasor
quantity

- (D) Algebraic
quantity

**6. What is the resistance of the inductive coil takes 5A current across 240V, 50Hz supply at 0.8 power factor?**

- (A) 48
Ohm

- (B) 42.5
Ohm

- (C) 38.4
Ohm

- (D) 26.6
Ohm

**7. What is the maximum value of voltage for 240 volt RMS?**

- (A) 240 V

- (B) 415 V

- (C) 339.5 V

- (D) 376.8 V

**8. What is the power factor in a 3 phase power measurement of two wattmeters showing equal readings?**

- (A) 0

- (B) 1

- (C) 0.5

- (D) 0.8

**9. What is the P.F if one of the wattmeters reading is zero and the other reads total power in 2 wattmeter method of 3 phase power measurement?**

- (A) 0.5

- (B) Zero

- (C) Unity

- (D) Below 0.5

**10. What is the form factor (Kf) for sinusoidal AC?**

- (A) 1

- (B) 1.11

- (C) 2.22

- (D) 4.44

**11. What is the power factor if one of the wattmeter gives negative reading in two wattmeter method of 3 phase power measurement?**

- (A) 0

- (B) 0.5

- (C) Unity

- (D) Less than
0.5

**12. What is the unit of susceptance?**

- (A) Mho

- (B) Ohm

- (C) Henry

- (D) Farad

**13. What is the phase displacement in a single phase AC circuit?**

- (A) 90°

- (B) 120°

- (C) 180°

- (D) 270°

**14. How the low power factor (P.F) can be improved in AC circuits?**

- (A) By
connecting resistors in series

- (B) By
connecting capacitors in series

- (C) By
connecting inductors in series

- (D) By
connecting capacitors in parallel

**15. How will you obtain positive reading in the wattmeter reads negative reading during 3- phase two wattmeter method?**

- (A) By
interchanging the connections of input terminals

- (B) By
disconnecting the connection of current coil in meter

- (C) By
reversing the connection of pressure coil in meter

- (D) By
reversing the pressure coil and current coil connection in meter

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