SPSC 2014Recruitment TestQuestion Paper

SPSC 2014 Micro Filming Officer BPS-16, Revenue Department (2014) — Paper Type D Paper

The official SPSC CCE 2014 Micro Filming Officer BPS-16, Revenue Department (2014) — Paper Type D question paper (recruitment test), set by the Sindh Public Service Commission. Every MCQ is typed out below with its correct answer marked.

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SPSC 2014 Micro Filming Officer BPS-16, Revenue Department (2014) — Paper Type D paper — full text

Every MCQ from the paper, with the correct answer marked in green.

Micro Filming Officer BPS-16, Revenue Department (2014) — Paper Type D. Pre-interview written test · Thursday 29 May 2014, 02:00 to 03:00 pm · Maximum marks 100. 50 MCQs (electronics). Each incorrect answer results in deduction of half mark.

1Induced emf in a transformer secondary depends upon
- A)Frequency
- B)Number of turns in secondary coil
- C)Maximum flux in the core
- D)All of these
Explanation: E = 4.44 f N Φm.
2When a magnet is heated
- A)It gains magnetism
- B)It loses magnetism
- C)It neither loses nor gains magnetism
- D)None of these
3Asynchronous counters are known as
- A)Ripple counter
- B)Multiple clock counters
- C)Decade counters
- D)All of these
4According to Shannon theorem, for a signal of frequency F, for complete transfer of information the sampling rate must be
- A)4F
- B)3F
- C)F
- D)2F
Explanation: The Nyquist rate is twice the highest frequency.
5Which system has tendency to oscillate?
- A)Open loop system
- B)Closed loop system
- C)Both open loop as well as closed loop system
- D)Neither open loop nor closed loop system
6The audio frequency range is
- A)0.3-3 KHz
- B)20Hz-20KHz
- C)3-30KHz
- D)0-100Hz
7A parallel circuit resonance magnifies
- A)Current
- B)Voltage
- C)Power
- D)Frequency
Explanation: Parallel resonance magnifies the circulating current (series resonance magnifies voltage).
8GaAs technology provides logic circuits having very high speeds of operation, with gate delays in the range of
- A)0.10 to 100 µS
- B)0.10 to 100 nS
- C)10 to 100 mS
- D)10 to 100 pS
9The internal capacitances of MOSFET cause the gain of MOS amplifier to fall off at
- A)High frequencies
- B)Moderate frequencies
- C)Low frequencies
- D)All of these
10Which of the following is not true about amplitude modulation (AM)?
- A)The carrier amplitude varies
- B)The carrier frequency remains constant
- C)The carrier frequency varies
- D)Information signal amplitude changes carrier amplitude
11Noise margin is expressed in
- A)Decibel
- B)Volt
- C)Watt
- D)None of these
12Quiescent state of an amplifier implies
- A)No input signal
- B)Zero bias
- C)No output
- D)No distortion
13Which of the distribution systems is used for domestic loads?
- A)3 phase, 4-wire system
- B)1 phase, 2-wire system
- C)3 phase, 3 wire system
- D)None of these
14Which one of the following is not a valid rule of Boolean algebra?
- A)A + 1 = 1
- B)AA = A
- C)A·Ā = A
- D)A + 0 = A
Explanation: A·Ā = 0, not A. (The printed option is unclear in the scan; the other three rules are valid.)
15Fuse wire is a wire of
- A)High resistance and low melting point
- B)High resistance and high melting point
- C)Low resistance and low melting point
- D)Low resistance and high melting point
16To avoid heat damage to heat sensitive components during soldering and their functioning, it is necessary to use
- A)Fans
- B)Heat sinks
- C)Heaters
- D)Nothing
17Class A amplifier is preferred where
- A)Minimum distortion is required
- B)More gain is required
- C)High power is needed
- D)Oscillators are to be improved
18An ion in a dielectric is a particle
- A)Semi-conducting
- B)Conducting
- C)Insulating
- D)Electron
Explanation: An ion is a charge carrier, so it conducts.
19An AM signal with a maximum modulating frequency of 4.5 KHz has a total bandwidth of
- A)9 KHz
- B)4.5 KHz
- C)12 KHz
- D)5 KHz
20The total input force must be equal to the sum of individual forces acting on the system. This statement is called
- A)Linearity theorem
- B)Maximum power theorem
- C)Superposition
- D)None of these
21The speed of light in a transmission line is ___ that in space
- A)Smaller than
- B)Greater than
- C)Same as
- D)Not related to
22A ceramic capacitor is marked 103; its value is
- A)0.01 µF
- B)103 µF
- C)10.3 µF
- D)None of these
Explanation: 10 × 10³ pF = 10 nF = 0.01 µF.
23A power circuit that converts a fixed voltage and frequency AC to a variable voltage and frequency AC is called
- A)Cycloconverter
- B)Static switches
- C)AC voltage controller
- D)Uncontrolled Rectifier
24The superposition theorem is used when the circuit contains
- A)A single voltage source
- B)A number of voltage sources
- C)Passive elements only
- D)None of these
25If a wattmeter is normally phased and it indicates reverse reading, the current and voltage are
- A)More than 90° out of phase
- B)Less than 90° out of phase
- C)Insufficient data
- D)None of these
26Harmonic distortion at higher power levels is
- A)Lower
- B)Higher
- C)Determined by 3 point method
- D)None of these
27If the poles of a control system are lying on the imaginary axis in s-plane, the system will be
- A)Stable
- B)Unstable
- C)Conditionally stable
- D)Marginally stable
28A frequency of 25MHz has a wavelength of approximately
- A)12 m
- B)15 m
- C)10 m
- D)17 m
Explanation: λ = 3×10⁸ / 25×10⁶ = 12 m.
29Which of the following is true: (I) Sensor is used to sense the physical parameter (II) Transducer is used to convert energy from one form to another
- A)Only I
- B)Both I & II
- C)Only II
- D)None of these
30The process of pre-distorting and un-distorting the signal before and after modulation respectively is called
- A)Equalization
- B)Emphasis
- C)Companding
- D)None of these
Explanation: Pre-emphasis before modulation and de-emphasis after demodulation.
31Darlington pair is used for
- A)Voltage amplification
- B)Power amplification
- C)Current amplification
- D)All of these
32Transformer efficiency will be maximum at a power factor of
- A)0.8 leading
- B)0.8 lagging
- C)0.9 lagging
- D)Unity
33Starter in a tube-light is basically
- A)Inductor
- B)Resistor
- C)Capacitor
- D)Transformer
Explanation: The usual answer; strictly a starter is a glow switch with a small capacitor across it.
34Early voltage can be obtained from the
- A)Input characteristics
- B)Bias point
- C)Output Characteristics
- D)Q-Point
35For which of the following flip-flops is the output clearly defined for all combinations of two inputs?
- A)D flip-flop
- B)R-S flip-flop
- C)JK flip-flop
- D)None of these
36The coefficient of coupling between the primary and secondary of a practical iron-cored transformer is about
- A)0.9
- B)0.1
- C)1.5
- D)0.2
37Band stop filter is known as
- A)Frequency reject filter
- B)Band reject filter
- C)Both (A) and (B)
- D)None of these
38Most commonly used language for PLC programming is
- A)STL
- B)LAD
- C)FBD
- D)VHDL
Explanation: Ladder logic (LAD).
39The original electrical information signal to be transmitted is called the
- A)Baseband signal
- B)Carrier
- C)Source signal
- D)Broadband signal
40The output of a 25 km fiber optic cable is measured at 0.005 mW. The fiber loss is 0.5 dB/km. What is the input power to the fiber?
- A)0.089 mW
- B)0.05 mW
- C)1 mW
- D)0.125 mW
Explanation: Loss = 12.5 dB, a factor of about 17.8: 0.005 × 17.8 ≈ 0.089 mW.
41Two electric bulbs rated for the same voltage have powers of 200 W and 100 W. If their resistances are respectively R1 and R2, then
- A)R1 = R2
- B)2 R1 = R2
- C)4 R1 = R2
- D)R1 = 4 R2
Explanation: R = V²/P, so the 100 W bulb has twice the resistance.
42The upper and lower side frequencies for 3 KHz audio modulation with a 27 MHz carrier will be
- A)30 and 24 MHz
- B)27.03 and 26.7 MHz
- C)27.03 and 26.97 MHz
- D)27.003 and 26.997 MHz
43What will be the binary code of (26)₁₀?
- A)11101
- B)11001
- C)11010
- D)10101
44How many voice channels does the T1 carrier comprise of?
- A)100
- B)24
- C)36
- D)48
45If an electric field strength of 50 V/cm is applied on positively charged holes, they drift in the direction of E and acquire drift velocity of 12.5 cm/sec. The mobility of holes would be
- A)0.25 cm²/V·s
- B)0.3 cm²/V·s
- C)0.22 cm²/V·s
- D)4 cm²/V·s
Explanation: µ = v / E = 12.5 / 50.
46The law that indicates that refraction can't take place when the angle of incidence is too large is known as
- A)Moore's law
- B)Faraday's law
- C)Snell's law
- D)Maxwell's law
47DC voltage across a 100 Ω resistor is 50V; the nominal power dissipated by the resistor is 25W. Maximum percentage error is 16%. The actual power may be in the range of
- A)21 and 29 watt
- B)84 and 116 watt
- C)42 and 58 watt
- D)None of these
48The picture carrier is always ___ above the low end of channel
- A)1.25 MHz
- B)2 MHz
- C)1 MHz
- D)0.8 MHz
49Another name of relative permittivity is
- A)Dielectric strength
- B)Break down voltage
- C)Specific inductive capacity
- D)Potential gradient
Explanation: The paper prints "specific inductive conductivity"; the term is specific inductive capacity.
50Which of the following are present in direct burial cables but not in aerial cables?
- A)Strength members
- B)Outer jacket
- C)Fiber housing
- D)Armor