Steel Authority Of India Limited (SAIL) Management Trainee MT Electronics Engineering Paper-2010

Steel Authority Of India Limited (SAIL)

Management Trainee

MT Electronics Engineering Paper-2010

1.Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is

• 5.7 mH
• 5.85 mH
• 6 mH
• 6.15 mH.

2.Two point charges Q and -Q are located on two opposite corners of a square as shown in figure. If the potential at the corner A is taken as 1V, then the potential at B, the center of the square will be

• Zero
• (1/2)^1/2V
• 1 V
• (2)^1/2V

3.Opto-couplers combine

• SITs and BJTs
• IGBTs and MOSFETS
• Power transformers and silicon transistor
• Infrared light-emitting diode and a silicon photo transistor

4.The difference between the indicated value and the true value of a quantity is known as

• Gross error
• Absolute error
• Dynamic error
• Relative error

5.The principles of homogeneity and super-position are applied to :

• linear time variant systems
• non-linear time variant systems
• linear time invariant systems
• non-linear time invariant systems.

6.In a 8085 microprocessor system with memory mapped I / 0,

• I / 0 devices have 8-bit addresses
• I / 0 devices are accessed using IN and OUT instructions
• there can be a maximum of 256 input devices and 256 output devices.
• arithmetic and logic operations can be directly performed with the I / 0 data.

7. The transistor shown in figure below, is biased

• at cut-off
• at saturation
• well into saturation
• well into cut-off

8.In any transmitting antenna system, efficiency primarily depends upon

• ohmic losses of various conductors
• radiation resistance
• ground conductivity
• atmospheric conditions.

9.An instruction used to set the carry Flag in a computer can be classified as

• data transfer
• arithmetic
• logical
• program control

10. The binary representation of 5.375 is

• 111.1011
• 101.1101
• 101.011
• 111.001

11. Dislocations in materials are

• point defect
• line defect
• planer defect
• surface defects.

12.In TV system, vertical pulses are separated out from horizontal pulses by the use of

• integrator
• differentiators
• sweep credit
• sync separator.

13.Frequency in the UHF range propagate by means of

• Ground waves
• Sky waves
• Surface waves
• Space waves.

14.200 MHz may be classified as

• VHF
• SHF
• UHF
• EHF

15.A communication satellite is a repeater between

• a transmitting station and a receiving station
• a transmitting station and many receiving stations
• many transmitting stations and many receiving stations
• none of the above

16.The power in a series R-L-C circuit will be half of that at resonance when the magnitude of the current is equal to

• V/2R
• V/(3R)^1/2
• V/(2R)^1/2
• 0

17. The efficiency of a chopper can be expected in the range

• 50 to 55 percent
• 65 to 72 percent
• 82 to 87 percent
• 92 to 99 percent

18.Which one out of the following instruments should be used to measure 600kV a.c.voltages ?

• Hot wire instrument
• Electrostatic voltmeter
• Moving coil voltmeter
• Moving iron voltmeter

19.The following programme is run on an 8085 microprocessor,
                        Memory address in Hex          Instruction
                                    2000                            LXI SP, 1000
                                    2003                            PUSH H
                                    2004                            PUSH D
                                    2005                            CALL 2050
                                    2008                            POP 2050
                                    2009                            HIT
As the completion of execution of the program, the program the program counter of the 8085 contains ………, and the stack pointer contains ……..

• 2050, OFFC
• 2251, OFFC
• 1025, OCCF
• 1025, OCCF

20.The smallest change in sound intensity that can be detected

• 1 dB
• 3 dB
• 10 dB
• 20 dB.

21.In a generic microprocessor, instruction cycle time is

• shorter than machine cycle time
• larger than machine cycle time
• exactly double the machine cycle time
• exactly the same as the machine cycle time

22. The value of M in the end will be
                        Do   100   I = 1, 2
                        DO   200   J = 1, 2
                                        M = M + I + J
                        200   CONTINUE
                        100   CONTINUE
                                    STOP
                                    END

• 10
• 11
• 12
• 14

23.Resistivity of electrical conductors is most affected by

• temperature
• pressure
• composition
• all of the above.

24.In CCIR B-system of TV, blanking pulse is placed during

• equalizing pulse
• retrace interval between each line
• retrace period of vertical line
• none of the above.

25.The polarization required in ground wave propagation is

• Horizontal (linear)
• vertical (linear)
• Circular
• Elliptical

26. Multicavity Klystron

• is not a microwave device
• is not a good low level amplifier because of noise
• is not suitable to pulse operation
• has a high repeller voltage to insure small transit time

27. Transponder comprises of

• Transmitter
• Receiver
• Antenna
• a, b, c combined

28.Which of the following regulator provides output voltage polarity reversal without a transformer

• Buck regulator
• Boost regulator
• Buck-boost regulator
• Cuk regulator

29.The deflection of hot wire instrument depends on

• RMS value of alternating current
• voltage
• average value of a.c. current
• instantaneous value of a.c. current

30. Dual slope integration type Analog-to-Digital converters provide

• higher speeds compared to all other types of A / D converters
• very good accuracy without putting extreme requirements on component stability
• poor rejection of power supply hums
• better resolution compared to all other types of A / D converters for the same number of bits.

31.The frequency modulated (FM) radio frequency range is nearly

• 250 - 300 MHz
• 150 - 200 MHz
• 90 - 105 MHz
• 30 - 70 MHz

32.A 32 bit microprocessor has the word length equal to

• 2 bytes
• 1 byte
• 4 bytes
• 8 bytes

33.Line imperfection in a crystal is called

• Schottky defect
• Frenkel defect
• edge dislocation
• Miller defect.

34.The function of diplexer bridge in a TV transmitter is

• to prevent the loading of several transmitters by video transmitter
• to increase the bandwidth
• to increase the power output
• to increase the efficiency of transmission.

35.Sometimes microwave signals follow the earth’s curvature. This due to

• Ionospheric reflection
• Faraday rotation
• Ducting
• Ionospheric scatter.

36.The modes in a reflex Klystron

• give the same frequency but different transit time
• result from excessive transit time across the resonator gap
• are caused by spurious frequency modulation
• are just for theoretical considerations.

37.The capacity of a channel is

• number of digits used in coding
• volume of information it can take
• maximum rate of information transmission
• bandwidth required for information