Q1. The Power Factor of an AC circuit is givan by
(A) Z/R
(B) R/XL
(C) XL/R
(D) R/Z
Answer: XL/R
Explanation:
Q2. Best electronic device for fast switching application s
(A) JFET
(B) MOSFET
(C) BJT
(D) diode
Answer: MOSFET
Explanation: 1. For current mode signal processing, BJT will be faster since its current amplification doesnt involve large changes in junction potential. 2. For switching applications where the collector/drain voltage has to go close to zero and back up, MOSFET will be faster, since in case of a BJT there will be minority carrier storage in the base in saturation which will take time to flush out. 3. For typical ciruits in modern processes (0.18um and lower) MOSFETs will be faster since they can be much smaller than BJT and therefore have smaller junction capacitances.
Q3. A forward resistance of diode will be
(A) small
(B) very high
(C) infinity
(D) zero
Answer: small
Explanation:
Q4. the output resistance of common base transistor circuit is of the order of
(A) 1 ohm
(B) 10 ohm
(C) 100 ohm
(D) zero
Answer: 100 ohm
Explanation:
Q5. The voltage regulation is .... . in an excellent power supply
(A) zero
(B) large
(C) infinity
(D) negative
Answer: zero
Explanation:
Q6. Rectifier: Oscillator::
(A) DC:AC
(B) capacitance: inductance
(C) series resonance: parallel resonance
(D) regulation: efficiency
Answer: DC:AC
Explanation:
Q7. A multivibrator can be used as
(A) cavity resonator
(B) harmonic generator
(C) waveform modifier
(D) any of these
Answer: harmonic generator
Explanation:
Q8. Transformer is ...... in full wave rectifier
(A) not essential
(B) essential
(C) need not be used
(D) may be used or may not
Answer: essential
Explanation:
Q9. The type of feedback used in Schmitt trigger is
(A) open loop
(B) negative feedback
(C) positive feedback
(D) None of the above
Answer: positive feedback
Explanation: Schmitt trigger convert any shaped wave to square wave.it has regenerative action hence it uses positive feedback.
Q10. When a network has 10 nodes and 17 branches then number of different node pair voltages would be
(A) 7
(B) 10
(C) 8
(D) 9
Answer: 9
Explanation:
Q11. Wien bridge uses
(A) resistors
(B) capacitors and resistors
(C) capacitors
(D) inductors
Answer: capacitors and resistors
Explanation:
Q12. Reactive current through capacitive load produces
(A) current
(B) Electric field
(C) magnetic field
(D) flux
Answer: Electric field
Explanation:
Q13. Ebers-Moll model of BJT is valid
(A) active mode
(B) cut-off mode
(C) saturation mode
(D) in active, saturation and cut-off modes
Answer: in active, saturation and cut-off modes
Explanation: Ebers Moll model is a simple and elegant way of representing the transistor as a circuit model. The Ebers Moll model of transistor holds for all regions of operation of transistor. This model is based on assumption that base spreading resistance can be neglected.
Q14. The Effective Channel Length of MOSFET in saturation decreases with increase in
(A) gate voltage
(B) drain voltage
(C) body voltage
(D) source voltage
Answer: drain voltage
Explanation:
Q15. varactor diode is used for
(A) amplification
(B) tuning purpose
(C) synchronization
(D) regulation
Answer: tuning purpose
Explanation:
Q16. Power factor of a series RLC Circuit at its half power points is
(A) unity
(B) either lagging or leading
(C) lagging
(D) leading
Answer: either lagging or leading
Explanation:
Q17. If power factor of a circuit is unity its reactive power is
(A) a maximum
(B) equal to (I^2)R
(C) zero
(D) a negative quantity
Answer: zero
Explanation:
Q18. BJT in CE mode Amplifier can be treated as
(A) non-inverting amplifier
(B) inverting amplifier
(C) voltage follower
(D) latching circuit
Answer: inverting amplifier
Explanation:
Q19. A power amplifier has a gain of 20dB and an input level of 2volts. Assuming that the input and impedance are the same, what is the voltage level at amplifier output?
(A) 200V
(B) 20V
(C) 10V
(D) 50V
Answer: 20V
Explanation:
Q20. The current amplification factor adc is given by ?
(A) IC/IE
(B) IB/IE
(C) IC/IB
(D) IE/IB
Answer: IC/IE
Explanation:
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