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Syllabus:

Some MCQs from FPSC Paper for Electrojic Engineer held on 01-02-2018
1. Which of the following consists of 2 SCRs
a) Diac b) UJT c) Triac d) None of these
2. Minimum current to keep SCR’s in on state
a) Latching Current b) Holding Current c) Forward Current d) None of these
3. In a 3-phase half control rectifier, the conduction angle of each diode is
a) 30 b) 60 c) 90 d) None of these
4. In a single phase full control rectifier during the overlap period, no. of SCR conduct
a) 2 b) 6 c) 8 d) None of these
5. In a single phase full control rectifier for load current I ripple free, average thyristor
current is
a) 1/3I b) 1/2I c) 1/6I d) None of these
6. The PIV across each diode in case of three phase rectifier
a) 1.73Vm b) 1.41Vm c) 1.707vm d) None of these
7. For a three phase, 6 pulse diode rectifier, average output voltage is
a) 0.551Vm b) 0.954 Vm c) 1.653Vm d) None of these
8. Which of the following comprises snubber circuit across SCR
a) RC circuit b) C circuit c) R circuit d) None of these
9. Resistivity of metals is expressed in terms of
a) Micro ohm b) micro ohm / cm c) micro ohm-cm d) None of these
10. Constantan contains
a) Copper & Nickle
b) Copper & Tungstan
c) Silver & Tin
d) None of these
11. The material used in resistance thermometer has the highest melting point
a) Platinum b) Copper c) Nickle d) None of these
12. Which material can be used at temperature above 100Oc
a) Polythene b) Teflon c) Rubber d) None of these
13. At Neel temperature
a) Permeability is maximum b) Permeability is minimum c) Susceptibility is
maximum d) None of these
14. Bakelite is
a) Semiconductor b) Uncombustable c) Dielectric d) None of these
15. If clocked RS flip flop has R=0, S=0, then the output Q will be
a) 0 b) 1 c) Indeterminate d) None of these
16. The 2nd complement of 1011.01 will be
a) 0100.10 b) 0101.10 c) 0100.00 d) None of these
17. The hexadecimal number A6BC will be equal to in decimal
18. The decimal number 4285.625 will be equal to in octal number
19. Which of the following is not a OPAM IC (LM 741, LM747, LM340, None of these)
20. Which of the following is Comparator IC
21. The sensitivity of voltmeter if it has Im = 5 miliampere
22. Which of the following is the time base signal in CRO
a) HF Sinusoidal b) Triangular c) Linearly increasing Saw Tooth d) None of these
23. If a meter has range of 0-1 A and Im= 10 miliampere & Rm= 9 ohm the value of shunt
resistance will be
24. The bandwidth of operational amplifier is limited by
a) Open Loop Gain b) Slew Rate Specification c) I/P Resistance d) None of these
25. The capacity of lead acid cell is measured in
a) Ampere-Hour b) Watt c) Miliampere-hour d) None of These
26. AAA batteries has the value of voltage
a) 1.1V b) 1.2V c) 2V d) None of these
27. Nickle Cadmium battery is used for
a) Automobiles b) Boats c) Mobile Phones d) None of these
28. The unit of capacitance
29. Calculation of charge using Faraday’s Law
30. The transmission line after grid is called (Transmission, Distribution, HT, None)
31. Cable used for distribution purpose is called ( Low Voltage, High Voltage, 220V, None)
32. Strain gauge should have ( Resistance Cofficient, Gauge Factor, Knob, None)
33. Which of the following bridge is used for the measurement of capacitance & in