SAMPLE PAPER 01 UKSSSC JUNIOR ENGINEER (ELECTRICAL)

  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, IB, of 20  A. The collector current, IC, 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 IDS change in an n-channel JFET?
    1. As VGS decreases ID decreases.
    2. As VGS increases ID increases.
    3. As VGS decreases ID remains constant.
    4. As VGS increases ID 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. IDSS
    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 VBE 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. IS versus VDS
    2. IC versus VCE
    3. ID versus VGS
    4. ID × RDs
  23. With a PNP circuit, the most positive voltage is probably:
    1. Ground
    2. VC
    3. VBE
    4. VCC
  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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