Previous Years Solved Placement Papers
- EJB class should implement:
(a) javax.ejb.EntityBean
(b) javax.ejb.rmi
(c) javax.ejb.EJBHome
(d) javax.ejb.EJBObject
(Ans: A) - Generally Servlets are used for complete HTML generation. If you want to generate partial HTMLs that include some static text (not hardcoded in Servlets) and dynamic text, what method do you use?
(a) Serverside includes
(b) JSP code in HTML
(c) Not possible to generate incomplete HTMLs using Servlets
- Which of the following cannot be used as the scope when using a JavaBean with JSP?
(a) session
(b) application
(c) request
(d) response
(Ans: D) - Which is true about Servlets?
(a) Only one instance of Servlet is created in memory
(b) Multi-threading is used to service multiple requests
(c) Both (a) & (b)
(Ans: C) - What is a Temporary Servlet?
(a) Servlet that is destroyed at runtime
(b) Servlet that exists for a session
(c) Servlet that is started and stopped for each request
(Ans: C)
Electronics Based Questions
- The breakdown mechanism in a lightly doped p-n junction under reverse biased condition is called:
(a) avalanche breakdown
(b) zener breakdown
(c) breakdown by tunneling
(d) high voltage breakdown
(Ans: A) - Removing bypass capacitor across the emitter-leg resistor in a CE amplifier causes:
(a) increase in current gain
(b) decrease in current gain
(c) increase in voltage gain
(d) decrease in voltage gain
(Ans: D) - When a step-input is given to an op-amp integrator, the output will be:
(a) a ramp
(b) a sinusoidal wave
(c) a rectangular wave
(d) a triangular wave with DC bias
(Ans: A) - Hysteresis is desirable in Schmitt-trigger, because:
(a) energy is to be stored/discharged in parasitic capacitances
(b) effects of temperature would be compensated
(c) devices in the circuit should be allowed time for saturation and desaturation
(d) it would prevent noise from causing false triggering
(Ans: C) - Space charge region around a p-n junction:
(a) does not contain mobile carriers
(b) contains both free electrons and holes
(c) contains one type of mobile carriers depending on the level of doping
(d) contains electrons only as free carriers
(Ans: A) - The important characteristic of an emitter-follower is:
(a) high input impedance and high output impedance
(b) high input impedance and low output impedance
(c) low input impedance and low output impedance
(d) low input impedance and high output impedance
(Ans: B) - In a JFET, at pinch-off voltage applied on the gate:
(a) the drain current becomes almost zero
(b) the drain current begins to decrease
(c) the drain current is almost at saturation value
(d) the drain-to-source voltage is close to zero volts
(Ans: C) - When an amplifier is provided with current series feedback, its:
(a) input impedance increases and output impedance decreases
(b) input and output impedances both decrease
(c) input impedance decreases and output impedance increases
(d) input and output impedances both increase
(Ans: D) - The fan-out of a MOS-logic gate is higher than that of TTL gates because of its:
(a) low input impedance
(b) high output impedance
(c) low output impedance
(d) high input impedance
(Ans: D) - In an intrinsic semiconductor, the Fermi-level is:
(a) closer to the valence band
(b) midway between conduction and valence band
(c) closer to the conduction band
(d) within the valence band
(Ans: C) - The common collector amplifier is also known as:
(a) collector follower
(b) base follower
(c) emitter follower
(d) source follower
(Ans: C) - In an amplifier with negative feedback:
(a) only the gain of the amplifier is affected
(b) only the gain and bandwidth of the amplifier are affected
(c) only the input and output impedances are affected
(d) all of the four parameters mentioned above would be affected
(Ans: D) - A differential amplifier, amplifies:
(a) and mathematically differentiates the average of the voltages on the two input lines
(b) and differentiates the input waveform on one line when the other line is grounded
(c) the difference of voltages between the two input lines
(d) and differentiates the sum of the two input waveforms
(Ans: C)