SPSC 2013Recruitment TestQuestion Paper

SPSC 2013 Technical Inspector (Electrical Engineering) BPS-17, Labour Department (2013) — Paper Type D Paper

The official SPSC CCE 2013 Technical Inspector (Electrical Engineering) BPS-17, Labour Department (2013) — 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 2013 Technical Inspector (Electrical Engineering) BPS-17, Labour Department (2013) — Paper Type D paper — full text

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

Technical Inspector (Electrical Engineering) BPS-17, Labour Department (2013) — Paper Type D. Pre-interview written test · Saturday 21 December 2013, 2:00 pm to 3:00 pm · Maximum marks 100. 50 MCQs; each incorrect answer deducts half mark.

1A ceiling fan uses
- A)split-phase motor
- B)Capacitor start and capacitor run motor
- C)Universal motor
- D)capacitor start motor
2Which of the following motor is most suitable for timing and signaling devices?
- A)DC series motor
- B)Reluctance motor
- C)DC compound motor
- D)Servo motor
3The short circuit test on a transformer gives the information about its
- A)winding circuit impedance
- B)core losses of the transformer
- C)copper losses of the transformer
- D)both (a) and (c)
4Prime movers for water turbines are
- A)Reaction turbines for low and medium heads
- B)impulse turbines for medium and high head
- C)reaction turbines for medium and high heads
- D)Both (a) and (b)
5A galvanometer may be converted into ammeter or voltmeter. In which of the following cases the resistance of the device will be largest?
- A)An Ammeter of range 10 A
- B)A voltmeter of range 5 V
- C)An ammeter of range 5 A
- D)A voltmeter of range 10 V
6____ will work only on D.C. supply
- A)Electric lamp
- B)Refrigerator
- C)Heater
- D)Electroplating
7The octal system has the radix of
- A)6
- B)2
- C)8
- D)10
8For which of the following flip-flop the output is clearly defined for all combinations of two inputs?
- A)D flip-flop
- B)R-S flip-flop
- C)JK flip-flop
- D)None of the above
9Which type of wattmeter cannot be used for dc?
- A)Electrostatic Type
- B)Dynamometer type
- C)Induction type
- D)None of the above
10A 230 V, 50 Hz single-phase energy meter has a load current of 10 A at power factor of 0.8 lagging. The energy consumed by the load in 2 minutes is
- A)0.06 kWh
- B)1.2 kWh
- C)2.4 kWh
- D)0.02 kWh
Explanation: 230 × 10 × 0.8 = 1.84 kW; × 2/60 h ≈ 0.061 kWh.
11To measure speed of the shaft without physical contact the method used is
- A)Digital method
- B)Variable reluctance tachometer
- C)Stroboscope
- D)None of these
12A NAND gate is equivalent to
- A)An AND gate followed by an OR gate
- B)An AND gate followed by an inverter
- C)An inverter followed by an OR gate
- D)An inverter followed by an AND gate
13The power factor of an alternator depends on
- A)Load
- B)Speed of rotor
- C)Core Losses
- D)Armature Losses
14Three resistors, each of 3 ohms are joined in parallel. Its total resistance will be
- A)9
- B)1/9
- C)27
- D)1
15A standard 40 W tube light is in parallel with a room heater and both are connected to main supply line. What will happen when light is switched off?
- A)The heater output will increase
- B)The heater output will decrease
- C)The heater output will remain same
- D)None of the above
16Magnetic flux density is a
- A)Vector Quantity
- B)Scalar Quantity
- C)Phasor
- D)None of the above
17Which of the following IC has only one input line?
- A)Multiplexer
- B)Demultiplexer
- C)AND gate
- D)BCD to decimal decoder
Explanation: A demultiplexer has one data input (plus select lines).
18A TRIAC
- A)Can trigger only on positive gate voltages
- B)can trigger only on negative gate voltages
- C)Cannot be triggered with gate voltages
- D)Can be triggered by either a positive or a negative gate voltage
19The purpose of providing a choke in a tube light is
- A)to eliminate corona effect
- B)to avoid radio interference
- C)to improve power factor
- D)to limit current to appropriate value
Explanation: The choke also gives the voltage kick that starts the tube.
20Diversity factor is the ratio of
- A)maximum load on the station to sum of consumer's maximum demands
- B)Average demand to maximum demand
- C)reciprocal of (b)
- D)reciprocal of (a)
Explanation: Diversity factor = sum of individual maximum demands ÷ maximum demand on the station.
21The sag of transmission line is affected by
- A)its own weight and weight of the ice
- B)temperature and wind conditions
- C)both of these
- D)either of (a) or (b)
22Transient stability limit is
- A)Equal to steady state stability limit
- B)less than steady state stability limit
- C)more than steady state stability limit
- D)undefined and based on power angle
23An isolator operates under
- A)fault conditions
- B)fault load conditions
- C)no load conditions
- D)both (a) and (b)
24The frequency domain and the time domain are related through
- A)Laplace transform
- B)Fourier integral
- C)Both A and B
- D)None of the above
25The operation of induction motor is based on
- A)Lenz's law
- B)Ampere's law
- C)Mutual (induction) law
- D)self induction
Explanation: The rotor current is induced by the stator field (mutual induction).
26Two identical heater coils are connected in parallel across the mains. If one of the coil breaks the other coil
- A)Develops lower temperature
- B)Develops same temperature
- C)Develops higher temperature
- D)Brightness does not depend upon resistance
27An other 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".
28Uninterruptible power supply (UPS) is used in
- A)Communication Links
- B)Computers
- C)Essential Instrumentation
- D)all of these
29The number of thyristors needed in three-phase to three-phase cycloconverter of 6-pulse type is
- A)4
- B)8
- C)18
- D)36
Explanation: A 3-pulse version needs 18; the 6-pulse bridge version needs 36.
30Static capacitors are rated in terms of
- A)kVA
- B)kVAr
- C)kWh
- D)kW
31Which of the following gas has been used as insulating medium in electrical appliances?
- A)Nitrogen
- B)Carbon dioxide
- C)Sulphur hexafluoride
- D)Freon
32Hexadecimal equivalent of decimal number 1000 is
- A)3E8
- B)4E8
- C)3C6
- D)3E7
Explanation: 3 × 256 + 14 × 16 + 8 = 1000.
33A NAND gate is equivalent to
- A)An AND gate followed by an OR gate
- B)An AND gate followed by an inverter
- C)An inverter followed by an OR gate
- D)An inverter followed by an AND gate
Explanation: Same as Q12.
34A length of wire has a resistance of 6 ohms. The resistance of a wire of the same material three times as long and twice the cross-sectional area will be
- A)36 ohms
- B)9 ohms
- C)1 ohm
- D)12 ohms
Explanation: 6 × 3 ÷ 2 = 9.
35The specific resistance of a metallic conductor ____ with rise in temperature.
- A)increases
- B)Decreases
- C)remains unchanged
- D)None of the above
36The insulation resistance of a cable is specified by the manufacturer at 250 mega-ohms per kilometer. The resistance of 200 meter length will be
- A)1250 mega-ohms
- B)250 mega-ohms
- C)125 mega-ohms
- D)50 mega-ohms
Explanation: Insulation resistance is inversely proportional to length: 250 ÷ 0.2 = 1250 MΩ.
37When the diameter of the core and cable is doubled, the value of capacitance will be: (a) Reduced to one fourth (b) Reduced to half (c) Doubled (d) Four times
Answer: C = 2πεL ÷ ln(D/d): doubling both diameters leaves D/d, and so the capacitance, unchanged. None of the printed options is right.
38Two bulbs are rated at 25 W, 100 V and 100 W, 100 V are connected in series to a 220 V supply. What will happen to circuit?
- A)100 W bulb will burn out
- B)25 W bulb will burn out
- C)both bulbs will burn out
- D)no bulb will burn out
Explanation: R = 400 Ω and 100 Ω; I = 220/500 = 0.44 A, so the 25 W bulb gets 176 V and burns out.
39Which is the oldest forest of Pakistan
- A)Changa Manga
- B)Junpur
- C)Chitral
- D)Chichawatni
Explanation: Changa Manga (planted 1866) is the oldest man-made forest.
40Which city of Pakistan is called "Gate way" of Pakistan
- A)Lahore
- B)Karachi
- C)Khyber
- D)A.J Kashmir
41What is the Nick name of Swat?
- A)Gate way of invaders
- B)Pearl of Himalya
- C)Switzerland
- D)Land of mountains
42Which city of Pakistan called "Manchester" of Pakistan
- A)Sialkot
- B)Multan
- C)Faisalabad
- D)Lahore
43Which valley is called "pearl of Himalya"?
- A)Naran
- B)Kaghan
- C)Chitral
- D)Swat
Explanation: As usually keyed; the nickname is not used consistently.
44When all India Muslim League was formed.
- A)1906
- B)1907
- C)1905
- D)1908
451 Metre consists of
- A)100 Centimetres
- B)1000 Millimetre
- C)10 Decimetres
- D)All of these
461 Tonne consists of
- A)500 Kilogram
- B)1000 Kilogram
- C)2000 Kilogram
- D)3000 Kilogram
471 Foot consists of 12 inches. How many feet are there in one yard?
- A)6
- B)4
- C)5
- D)3
48Indonesia's old name is
- A)Suriname
- B)Dutch East Indies
- C)Indo china
- D)Aceh
49What is the new name of Ceylon?
- A)Nepal
- B)Sri Lanka
- C)Burma
- D)Bhutan
50Iraq is the new name of
- A)Euphrates
- B)Mesopotamia
- C)Hispania
- D)Dajla