Mahagenco Electronics Engineer Solved question paper

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1. A motor which can conveniently be operated at lagging as well as leading power factors is the

(A) squirrel cage induction motor.
(B) wound rotor induction motor.
(C) synchronous motor.
(D) DC shunt motor.
Ans: C



2. Space charge region around a p-n junction

(A) does not contain mobile carriers
(B) contains both free electrons and holes
(C) contains one type of mobile carriers depending on the level of doping of the p or n regions
(D) contains electrons only as free carriers
Ans: A



3. A 1:5 step-up transformer has 120V across the primary and 600 ohms resistance across the secondary. Assuming 100% efficiency, the primary current equals

(A) 0.2 Amp.
(B) 5 Amps.
(C) 10 Amps.
(D) 20 Amps.
Ans: A
EX: I1= V1 /R1 = 120/600 = 0.2 (ɳ = 100%, losses are zero therefore V1 = VR = I1R1)



4. A highly stable resonance characteristic is the property of a ____ oscillator.

(A) Hartley
(B) Colpitts
(C) Crystal
(D) Weinbridge
Ans. (C)



5. The speed-torque characteristics of a DC series motor are approximately similar to those of the _________motor.

(A) universal
(B) synchronous
(C) DC shunt
(D) two-phase
Ans:A



6. In the heating process of the ________type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains them when cooled to a temperature below this value.

(A) Indirect induction over
(B) core type induction furnace
(C) coreless induction furnace
(D) high frequency eddy current
Ans: D



7. The ________is a circuit-switched network, while the ______is a packet-switched network.

(A) Telephone, ATM
(B) SONET and FDDI
(C) Satellite, Telephone
(D) FDDI and SONET
Ans: (A)



8. Skewing in the slots of an induction motor is provided to reduce

(A) iron loss
(B) noise
(C) harmonics
(D) temperature rise.
Ans:C



9. The losses occurring in the rotor of an induction motor are less than those in the stator because of

(A) small diameter of rotor
(B) less rotor frequency
(C) slot skewing
(D) none of the above
Ans:B



10. Which test is conducted on transformers to check its ability to withstand the transient voltages due to lightening etc. ?

(A) Induced over voltage test
(B) Partial discharge test
(C) Impulse test
(D) Any of the above.
Ans:C



11. The output of a rotating electrical machine is limited by

(A) size of the machine
(B) peripheral velocity
(C) temperature rise
(D) none of the above.

Ans:C



12. A synchronous machine having large length of the air gap will have

(A) higher noise level
(B) smaller unbalanced magnetic pull
(C) lower limit of stability
(D) higher value of inherent regulation.
Ans:B



13. Bulk power transmission over long HVDC lines are preferred, on account of

(A)low cost of HVDC terminals

(B)no harmonic problems

(C)minimum line power losses

(D)simple protection

Ans:C



14. The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary output voltage will be

(A) 3.6 V.
(B) 2.5 V.
(C) 3.0 V.
(D) 6.0 V.
Ans: C



15. By using feedback in control systems, the sensitivity to parameter variation is improved.This is achieved at the cost of

(A) stability
(B) loss of system gain
(C) transient response
(D) reliability
Ans: (B)



16. The fan-out of a MOS-logic gate is higher than that of TTL gates because of its

(A) low input impedance
(B) high output impedance
(C) low output impedance
(D) high input impedance
Ans: D



17. Divergence theorem is applicable for

(A) static field only
(B) time varying fields only
(C) both static and time varying fields
(D) electric fields only
Ans: C



18. A highly stable resonance characteristic is the property of a ____ oscillator.

(A) Hartley
(B) Colpitts
(C) Crystal
(D) Weinbridge
Ans. (C)



19. For a JFET, when VDS is increased beyond the pinch off voltage, the drain current

(A) Increases
(B) decreases
(C) remains constant.
(D) First decreases and then increases.

Ans. (C)



20. A radio frequency signal contains three frequency components, 870 KHz, 875 KHz and 880 KHz. The signal needs to be amplified. The amplifier used should be

(A) audio frequency amplifier
(B) wide band amplifier
(C) tuned voltage amplifier
(D) push-pull amplifier
Ans. (C)
EX:We need to amplify 3 signal frequencies i.e., 870 kHz, 875 kHz and 880 kHz. These frequencies lie in a bandwidth of 10 kHz and we should use only tuned voltage amplifiers to amplify them.



21. An oscillator of the LC type that has a split capacitor in the circuit is

(A) Hartley oscillator
(B) Colpitts oscillator
(C) Weinbridge oscillator
(D) R-C phase shift oscillator
Ans. (B)



22. In the voltage range, Vp < VDS < BVDSS of an ideal JFET or MOSFET

(A) The drain current varies linearly with VDS.
(B) The drain current is constant.
(C) The drain current varies nonlinearly with VDS.
(D) The drain current is cut off.
Ans: (B)



23. In a clamping circuit, the peak-to peak voltage of the waveform being clamped is

(A) affected by the clamping
(B) not affected by the clamping
(C) determined by the clamping voltage value
(D) determined by the ratio of rms voltage of the waveform and the clamping voltage
Ans: B



24. A ‘literal’ in Boolean Algebra means

(A) a variable inn its uncomplemented form only
(B) a variable ORed with its complement
(C) a variable in its complemented form only
(D) a variable in its complemented or uncomplemented form
Ans: D



25. A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases four times, the skin depth, will

(A) increase by a factor of 2.
(B) decrease by a factor of 4.
(C) remain the same.
(D) decrease by a factor of 2.
Ans: D



26. The frequency of the ripple in the output voltage of a 3-phase semiconverter depends upon

(A)firing angle and load resistance
(B)firing angle and supply frequency
(C)firing angle and load inductance
(D)only on load circuit parameters
Ans:B



27. A single phase diode bridge rectifier supplies a highly inductive load. The load current can be assumed to be ripple free. The ac supply side current waveform will be

(A) sinusoidal
(B) constant dc.
(C) square
(D) triangular
Ans: C



28. The breakdown mechanism in a lightly doped p-n junction under reverse biased condition is called

(A) avalanche breakdown.
(B) zener breakdown.
(C) breakdown by tunnelling.
(D) high voltage breakdown.

Ans: A



29. For a large values of |VDS|, a FET – behaves as

(A) Voltage controlled resistor.
(B) Current controlled current source.
(C) Voltage controlled current source.
(D) Current controlled resistor.
Ans: C



30. The minimum number of flip-flops required to construct a mod-75 counter is

(A) 5
(B) 6
(C) 7
(D) 8

Ans: C