Question: On which of the following routine tests are conducted ?

• 1. Oil circuit breakers
• 2. Air blast circuit breakers
• 3. Minimum oil circuit breakers
• 4. All of the above

Question: The arcing contacts in a circuit breaker are made of______________?

• 1. copper tungsten alloy
• 2. porcelain
• 3. electrolytic copper
• 4. aluminium alloy

Question: Arc in a circuit behaves as_______________?

• 1. a capackive reactance
• 2. an inductive reactance
• 3. a resistance increasing with voltage rise across the arc
• 4. a resistance decreasing with voltage rise across the arc

Question: Fault diverters are basically____________?

• 1. fuses
• 2. relays
• 3. fast switches
• 4. circuit breakers

Question: Magnetic circuit breaker has ___________ trip action.

• 1. delayed
• 2. instantaneous
• 3. both of the above
• 4. none of the above

Question: Thermal circuit breaker has____________?

• 1. delayed trip action
• 2. instantaneous trip action
• 3. both of the above
• 4. none of the above

Question: With which of the following, a circuit breaker must be equipped for remote operation ?

• 1. Inverse time trip
• 2. Time-delay trip
• 3. Shunt trip
• 4. None of the above

Question: The main function of a fuse is to_____________?

• 1. protect the line
• 2. open the circuit
• 3. protect the appliance
• 4. none of the above

Question: An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?

• 1. 10 volts
• 2. 5 volts
• 3. 5/ volts
• 4. 5/2 volts

Question: A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?

• 1. 50KHz
• 2. 100KHz
• 3. 1000/17KHz
• 4. 1000/7.07KHz