Question: Which of the following statements pertains to resistors only _____________?

• 1. can dissipate considerable amount of power
• 2. can act as energy storage devices
• 3. connecting them in parallel in¬creases the total value
• 4. oppose sudden changes in voltage

Question: Wire-wound resistors are unsuitable for use at high frequencies because they_______?

• 1. create more electrical noise
• 2. are likely to melt under excessive eddy current heat
• 3. consume more power
• 4. exhibit unwanted inductive and capacitive effects

Question: The purpose of a parallel circuit resonance is to magnify________?

• 1. current
• 2. voltage
• 3. power
• 4. frequency

Question: All definitions of power factor of a series R-L-C circuit are correct except__________?

• 1. ratio of net reactance and impedance
• 2. ratio of kW and kVA
• 3. ratio of J and Z
• 4. ratio of W and VA

Question: In AC. circuits, laminated iron is invariably used in order to__________?

• 1. reduce eddy current loss
• 2. increase heat radiation
• 3. make assembly cheap and easier
• 4. reduce circuit permeability

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