Electrical Measurements Mock Test 2

10%

Question 1 of 10

1. Value of unknown resistance is found by using which of the following relation?

R_x = \(\frac{R_2}{R_1}\)

R_x = \(\frac{R_2 R_1}{R_3}\)

R_x = \(\frac{R_1 R_3}{R_2}\)

R_x = \(\frac{R_2 R_3}{R_1}\)

Question 1 of 10

Question 2 of 10

2. In a three phase system, the neutral is _________

connected to low voltage

connected to high voltage

earthed

not connected

Question 2 of 10

Question 3 of 10

3. Resistances R₁ and R₂ have respectively, nominal values of 10Ω and 5Ω and limiting error of ± 5% and ± 10%. The percentage limiting error for the series combination of R₁ and R₂ is?

7.77%

6.67%

5.5%

2.8%

Question 3 of 10

Question 4 of 10

4. A DC ammeter is rated for 15 A, 250 V. The meter constant is 14.4 A-s/rev. The meter constant at rated voltage may be expressed as __________

3600 rev/kW-h

960 rev/kW-h

1000 rev/kW-h

3750 rev/kW-h

Question 4 of 10

Question 5 of 10

5. The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. Find the magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m.

10 A

12.56 A

14.95 A

13.04 A

Question 5 of 10

Question 6 of 10

6. A voltmeter has a sensitivity of 1000 Ω/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The apparent resistance of the unknown resistor will be?

20 kΩ

21.43 kΩ

18.57 kΩ

22.36 kΩ

Question 6 of 10

Question 7 of 10

7. What is an earth electrode?

material used for earthing

electrode connected to the circuit

electrode which is connected to the mains

electrode that is connected to earth

Question 7 of 10

Question 8 of 10

8. At high frequencies in an AC bridge, the source is _______

high voltage source

tuned amplifiers

vibration galvanometer

oscillators

Question 8 of 10

Question 9 of 10

9. Source is ________

ac supply

dc supply

mixed mode supply

high voltage supply

Question 9 of 10

Question 10 of 10

10. Anderson’s bridge is used for the measurement of ________

impedance

capacitance

resistance

inductance

Question 10 of 10