Question: An ideal OP-AMP is an ideal______________?

• 1. Current controlled Current source
• 2. Current controlled voltage source
• 3. Voltage controlled voltage source
• 4. voltage controlled current source

Question: A non inverting closed loop op amp circuit generally has a gain factor______________?

• 1. Less than one
• 2. Greater than one
• 3. Of zero
• 4. Equal to one

Question: The closed-loop voltage gain of an inverting amplifier equal to______________?

• 1. The ratio of the input resistance to feedback resistance
• 2. The open-loop voltage gain
• 3. The feedback resistance divided by the input resistance
• 4. The input resistance

Question: Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF___________?

• 1. 1.273kHz
• 2. 12.73kHz
• 3. 127.3 kHz
• 4. 127.3 Hz

Question: In an electric press mica is used_____________?

• 1. as an insulator
• 2. as a device for power factor improvement
• 3. for dielectric heating
• 4. for induction heating

Question: By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?

• 1. Coreless transformers
• 2. Current transformers
• 3. Motor-generator set
• 4. Multi-phase transformer

Question: The temperature inside a furnace is usually measured by which of the following ?

• 1. Optical pyrometer
• 2. Mercury thermometer
• 3. Alcohol thermometer
• 4. Any of the above

Question: Which of the following insulating materials was suitable for low temperature applications ?

• 1. Asbestos paper
• 2. Diatomaceous earth
• 3. 80 percent magnesia
• 4. Cork

Question: The material of the heating element for a furnace should have___________?

• 1. lower melting point
• 2. higher temperature coefficient
• 3. high specific resistance
• 4. all of the above

Question: In an electric room heat convector the method of heating used is______________?

• 1. arc heating
• 2. resistance heating
• 3. induction heating
• 4. dielectric heating