1. Increasing  the number of turns of wire on the secondary of a transformer will
   1. increase the primary current
   2. increase the secondary current
   3. decrease the secondary current
   4. have no effect on the secondary current
2. The transformer turns ratio determines
   1. the ratio of primary and secondary voltages
   2. the ratio of primary and secondary currents
   3. the reflected impedance
   4. all of the above
3. Mutual induction is dependent on
   1. winding ratios
   2. output polarities
   3. dc voltage levels
   4. current changes
4. A special transformer used to convert unbalanced signals to balanced signals is the
   1. Balun
   2. Autotransformer
   3. center-tapped transformer
   4. step-across transformer
5. A transformer has
   1. primary and secondary windings, both of which are considered inputs
   2. primary and secondary windings, both of which are considered outputs
   3. a primary winding used as an output and a secondary winding used as an input
   4. a primary winding used as an input and a secondary winding used as an output
6. If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
   1. 100 W
   2. 50 W
   3. 75 W
   4. 200 W
7. When transistors are used in digital circuits they usually operate in the:
   1. active region
   2. breakdown region
   3. saturation and cutoff regions
   4. linear region
8. Three different Q points are shown on a dc load line. The upper Q point represents the:
   1. minimum current gain
   2. intermediate current gain
   3. maximum current gain
   4. cutoff point
9. A transistor has a  of 250 and a base current, I_B, of 20  A. The collector current, I_C, equals:
   1. 500  A
   2. 5 mA
   3. 50 mA
   4. 5 A
10. Junction Field Effect Transistors (JFET) contain how many diodes?
    1. 4
    2. 3
    3. 2
    4. 1
11. D-MOSFETs are sometimes used in series to construct a cascode high-frequency amplifier to overcome the loss of:
    1. low output impedance
    2. capacitive reactance
    3. high input impedance
    4. inductive reactance
12. A JFET
    1. is a current-controlled device
    2. has a low input resistance
    3. is a voltage-controlled device
    4. is always forward-biased
13. In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid
    1. crossover distortion
    2. unusually high efficiency
    3. negative feedback
    4. a low input impedance
14. Which of the following conditions are needed to properly bias an npn transistor amplifier?
    1. Forward bias the base/emitter junction and reverse bias the base/collector junction.
    2. Forward bias the collector/base junction and reverse bias the emitter/base junction.
    3. Apply a positive voltage on the n-type material and a negative voltage on the p-type material.
    4. Apply a large voltage on the base
15. The depletion-mode MOSFET
    1. can operate with only positive gate voltages
    2. can operate with only negative gate voltages
    3. cannot operate in the ohmic region
    4. can operate with positive as well as negative gate voltages
16. In the constant-current region, how will the I_DS change in an n-channel JFET?
    1. As V_GS decreases I_D decreases.
    2. As V_GS increases I_D increases.
    3. As V_GS decreases I_D remains constant.
    4. As V_GS increases I_D remains constant
17. To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?
    1. collector-emitter
    2. base-collector
    3. base-emitter
    4. Collector-base
18. With the E-MOSFET, when gate input voltage is zero, drain current is:
    1. at saturation
    2. zero
    3. I_DSS
    4. widening the channel
19. A very simple bias for a D-MOSFET is called:
    1. self biasing
    2. gate biasing
    3. zero biasing
    4. voltage-divider biasin
20. When a silicon diode is forward biased, what is V_BE for a C-E configuration?
    1. voltage-divider bias
    2. 0.4 V
    3. 0.7 V
    4. emitter voltage
21. Which JFET configuration would connect a high-resistance signal source to a low-resistance load?
    1. source follower
    2. common-source
    3. common-drain
    4. common-gate
22. The transconductance curve of a JFET is a graph of:
    1. I_S versus V_DS
    2. I_C versus V_CE
    3. I_D versus V_GS
    4. I_D × R_Ds
23. With a PNP circuit, the most positive voltage is probably:
    1. Ground
    2. V_C
    3. V_BE
    4. V_CC
24. Filters are used to convert
    1. Pulsating dc signal into a pure dc signal
    2. Pure dc signal into a pulsating dc signal
    3. Pulsating dc signal into a pure ac signal
    4. Pulsating ac signal into a pure dc signal
25. The cut - in voltage for silicon and germanium are
    1. 0.3 V, 0.3 V
    2. 0.3 V, 0.7 V
    3. 0.7 V, 0.7 V
    4. 0.7 V, 0.3 V
26. The P - type semiconductor impurities are also called as
    1. Acceptor impurities
    2. Donor impurities
    3. Either (a) or (b)
    4. None of these
27. In N - type semiconductor, the impurities added to a semiconductor are
    1. Trivalent
    2. Pentavalent
    3. Monovalent
    4. Tetravalent
28. Impurities are generally added in the pure semiconductor to
    1. increase the number of electrons
    2. increase the number of holes
    3. increase their conductivity
    4. all of these
29. In DOL fuses are provided to protect against
    1. Short circuit protection
    2. Over voltage
    3. Over current
    4. Over load
30. The overload release protects the motor against
    1. Over voltage
    2. Over current
    3. Over load
    4. All of these
31. 3 - point starter is used to start the
    1. Series motor
    2. Shunt motor
    3. Compound motor
    4. Only (b) and (c)
32. Lithium cells operates ranging from
    1. -25 ° C to 25 ° C
    2. -50 ° C to 25 ° C
    3. -50 ° C to 75 ° C
    4. -75 ° C to 75 ° C
33. In leclanche cell, anode is packed in a porous pot containing
    1. manganese dioxide
    2. charcoal powder
    3. sulphur dioxide
    4. only (a) and (b)
34. The handle of iron box is made up of
    1. Bakelite
    2. Ebonite
    3. Chromium
    4. Only (a) and (b)
35. From full load to no load, the change of terminal voltage is more in case of
    1. Lagging power factor
    2. Leading power factor
    3. Unity power factor
    4. Both lagging and leading power factor compared to unity power factor
36. Buzzer in principle is a bell
    1. with hammer
    2. with gong
    3. with both hammer and gong
    4. without hammer and gong
37. The net power in a series R-C circuit is
    1. Zero
    2. Positive
    3. Negative
    4. None of these
38. The synchronous generator is also called an
    1. AC generator
    2. Alternator
    3. DC generator
    4. Only (a) and (b)
39. The forward voltage drop across a diode is about....
    1. 2.5V
    2. 3V
    3. 10V
    4.  0.7V
40. A semiconductor diode is used as
    1.  An amplifier
    2.  A Rectifier
    3.  An oscillator
    4.  A voltage regulator
41. A semiconductor diode has ....
    1.  One PN junction
    2.  Two PN junction
    3.  Three PN junction
    4.  Four PN junction
42. If the arrow of diode symbol is positive with respect to bar, then the diode is ....biased
    1.  Forward
    2. Reverse
    3. Either forward or reverse
    4. None of the above
43. If the temperature of the diode increases, then leakage current....
    1. Remains same
    2. Decreases
    3. Increases
    4. Becomes zero
44. The output of an AND gate is LOW ________.
    1. all the time
    2. when any input is LOW
    3. when any input is HIGH
    4. when all inputs are HIGH
45. A full subtracter circuit requires ________.
    1. two inputs and two outputs
    2. two inputs and three outputs
    3. three inputs and one output
    4. three inputs and two outputs
46. Give the decimal value of binary 10010.
    1. 6₁₀
    2. 9₁₀
    3. 18₁₀
    4. 20₁₀
47. A flip-flop has ________.
    1. one stable state
    2. no stable states
    3. two stable states
    4. none of the above
48. What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?
    1. tristate
    2. end around
    3. universal
    4. conversion
49. The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.
    1. A = 1, B = 1, C = 0
    2. A = 0, B = 0, C = 0
    3. A = 1, B = 1, C = 1
    4. A = 1, B = 0, C = 1
50. The output of a NOR gate is HIGH if ________.
    1. all inputs are HIGH
    2. any input is HIGH
    3. any input is LOW
    4. all inputs are LOW

Answer’s are marked Bold
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