Question: A parallel AC. circuit in resonance will__________?

• 1. have a high voltage developed across each inductive and capacitive section
• 2. have a high impedance
• 3. act like a resistor of low value
• 4. have current in each section equal to the line current

Question: The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

• 1. 4 kVAR
• 2. 6 kVAR
• 3. 8 kVAR
• 4. 16 kVAR

Question: The ratio of active power to apparent power is known as factor__________?

• 1. demand
• 2. load
• 3. power
• 4. form

Question: The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?

• 1. iron loss in core
• 2. skin effect
• 3. increase in temperature
• 4. capacitive effect between adjacent coil turns

Question: A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?

• 1. the big size of the inductor
• 2. the reactance of the inductor
• 3. the current flowing in the inductor
• 4. the statement given is false

Question: The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?

• 1. 12 kW
• 2. 22 kW
• 3. 32 kW
• 4. 64 kW

Question: In an AC. circuit, a low value of kVAR compared with kW indicates_________?

• 1. low efficiency
• 2. high power factor
• 3. unity power factor
• 4. maximum load current

Question: Which of the following coil will have large resonant frequency __________?

• 1. A coil with large resistance
• 2. A coil with low resistance
• 3. A coil with large distributed capacitance
• 4. A coil with low distributed capacitance

Question: If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?

• 1. 42.42 sin 3141
• 2. 60 sin 25 t
• 3. 30 sin 50 t
• 4. 84.84 sin 25 t

Question: In a R-L-C circuit_________?

• 1. power is consumed in resistance and is equal to I R
• 2. exchange of power takes place between inductor and supply line
• 3. exchange of power takes place between capacitor and supply line
• 4. all above are correct