ECET EEE 2010-2

1. The capacitances of a parallel plate capacitor is not influenced by

A) Thickness of the conducting plates
B) Area of the conducting plates
C) Distances seperating the plates
D) Nature of the dielectric between the plates

Answer : Thickness of the conducting plates
Explanation:-

2. In a parallel RLC Circuit, at resonant frequency

A) Line current at maximum
B) Total impedance is minimum
C) Inductive branch current is minimum
D) Total impedance is maximum

Answer : Total impedance is maximum
Explanation:-

3. In the two-wattmeter method of measuring power in a three phase circuit, the two wattmeter will show equal readinds when the power factor angle ∅ is equal to

A) 90°
B) 60°
C) 30°
D) 0°

Answer : 0°
Explanation:-

4. In a three phase system, the phase sequence is used to indicate the

A) Amplitude of the phase voltages
B) Frequency of the phase voltages
C) Order in which the phase voltages attain the maximum values
D) Phase angle between the phase voltages

Answer : Order in which the phase voltages attain the maximum values
Explanation:-

5. The bandwidth of a series RLC resonating circuit is represented by

A) R/(2πL)
B) C/(2πL)
C) C/(2πR)
D) L/(2πR)

Answer : R/(2πL)
Explanation:-

6. The No load current of a transformer typically forms the following percent of full load current

A) 1 to 4%
B) 4 to 8%
C) 8 to 12%
D) 12 to 16%

Answer : 4 to 8%
Explanation:-

7. As compared to an electric motor the efficiency of a transformer of the same rating is

A) Much Higher
B) Slightly Higher
C) Slightly smaller
D) Much smaller

Answer : Much Higher
Explanation:-

8. The short circuit test is used in a transformer to determine

A) Copper losses at any load
B) Hysteresis loss
C) Iron loss at any load
D) Eddy current loss

Answer :
Explanation:-

9. The tranformer operating in a parallel share the load depending on their

A) Efficiency
B) Rating
C) Leakage reactance
D) Per unit impedance

Answer : Rating
Explanation:-

10. In a tranformer, the voltage per turn in primary and secondary are

A) Always the same
B) Always in the ratio
C) Always different
D) in the rato 1/K

Answer : Always the same
Explanation:-