# Ongc Graduate Trainee Exam 2012 Free Online Practice Test

31 Questions | Total Attempts: 67  Settings Create your own Quiz FOR ELECTRONICS/ELECTRONICS & TELECOMMUNICATION BRANCH EXAM TIME:3 HRS EXAM QUESTIONS: 150 BREAKUP OF QUESTIONS: TECHNICAL:80 QUESTIONS GENERAL AWARENESS:40 QUESTIONS APTITUDE:30 QUESTIONS THERE IS NO NEGATIVE MARKING

• 1.
If the energy gap of semiconductor is 1.1 eV, then it would be
• A.

Opaque to the visible light

• B.

Transparent to the visible light

• C.

Transparent to the ultraviolet radiation

• D.

Opaque to the infrared radiation

• 2.
With increasing temperature, the electrical conductivity would
• A.

Increase in metals as well as in intrinsic semiconductors

• B.

Increase in metals but decrease in intrinsic semiconductors

• C.

Decrease in metals but increase in intrinsic semiconductors

• D.

Decrease in metals as well as in intrinsic semiconductors

• 3.
Energy Gap in Semi conductor's is
• A.

Transparent to shorter Wavelengths and Opaque to Larger wavelengths

• B.

Transparent to Longer Wavelengths and Opaque to Shorter Wavelengths

• C.

Transparent to both Longer wave and Shorter wave lengths

• D.

Opaque to both Longer wave and Shorter wave lengths

• 4.
Conductivity Of Intrinsic semi conductors depend up on
• A.

Temperature

• B.

Band Gap

• C.

Both a and b

• D.

None of these

• 5.
Loading effect is primarily caused by instruments having
• A.

High resistance

• B.

High sensitivity

• C.

Low sensitivity

• D.

High range

• 6.
A 3½ digit voltmeter having a resolution of 100 mV can be used to measure maximum voltage of
• A.

100V

• B.

200V

• C.

1000V

• D.

5000V

• 7.
Match List I (Bridges) with List II (Parameters) and select the correct answer: List I A. Anderson bridge B. Kelvin Bridge C. Schering Bridge D. Wheal stone Bridge List II 1. Low Resistance 2. Medium Resistance 3. Inductance 4. Capacitance A B C D
• A.

4 2 3 1

• B.

3 2 4 1

• C.

3 1 4 2

• D.

4 1 3 2

• 8.
• A.

Piezoelectric crystal

• B.

Capacitor

• C.

Mutual inductance

• D.

Strain gauges

• 9.
Match List I (Devices) with list II (Characteristics) and select the correct answer: List I A. BJT B. MOSFET C. Tunnel diode D. Zener diode List II 1. Voltage controlled negative resistance 2. High current gain 3. Voltage regulation 4. High input impedance A  B  C  D
• A.

1 4 2 3

• B.

2 4 1 3

• C.

2 3 1 4

• D.

1 3 2 4

• 10.
To avoid thermal runway in the design of an analog circuit, the operating point of the BJT should be such that it satisfies the condition
• A.

I V VCE = 1/2 VCC

• B.

VCE

• C.

VCE > 1/2VCC

• D.

VCE

• 11.
Consider the following devices: 1. BJT in CB mode 2. BJT in CE mode 3. JFET 4. MOSFET The correct sequence of these devices in increasing order of their input impedance is
• A.

1,2,3,4

• B.

2,1,3,4

• C.

2,1,4,3

• D.

1,3,2,4

• 12.
Consider the following statements for a 2- port network: 1. Z11 = Z22 2. h 12 = h 21 3. Y12= - Y21 4. BC-AD = - 1 The network is reciprocal if and only if
• A.

1 and 2 are correct

• B.

2 and 3 are correct

• C.

3 and 4 are correct

• D.

4 alone is correct

• 13.
On closing switch ‘S’ the circuit in the given figure is in steady-state. The current in the inductor after opening the switch ‘S’ will
• A.

Decay exponentially with a time constant of 2 s constant of 2s

• B.

Decay exponentially with a time constant of 0.5s

• C.

Consist of two decaying exponential each with a time constant of O.5s

• D.

Be oscillatory

• 14.
Match List I with list II for the driving point impedance synthesis and select the correct answer: List (form) A. Cauer I B. Cauer II C. Foster I D. Foster II List II (Networks) 1. L in series aims and C in shunt arms of a ladder 2. C in series arms and L in shunt arms of a ladder 3. Series combination of L and C in parallel 4. Parallel combination of L and C in series A   B   C   D
• A.

1 2 3 4

• B.

1 2 4 3

• C.

2 1 4 3

• D.

2 1 3 4

• 15.
Poles and zeros of a driving-point function of a network are simple and interlace on the jw axis. The network consists of elements
• A.

R and C

• B.

L and C

• C.

R and L

• D.

R, L and C

• 16.
The discrete-time equation y(n + 1) + 0.5n y(n) = 0.5x (n + 1) is NOT attributable to a
• A.

Memoryless system

• B.

Time-varying system

• C.

Linear system

• D.

Causal system

• 17.
The maximum power handling capacity of a resistor depends on
• A.

Total surface area

• B.

Resistance value

• C.

Thermal capacity of the resistor

• D.

Resistivity of the material used in the resistor

• 18.
Match List I (Bridges) with List II (Quantities) and select the correct answer List I A. Maxwell’s bridge B. Wien bridge C. Hay’s bridge D. Schering bridge List II 1. Frequency 2. Inductance with value of Q < 10 3. Capacitance 4. Inductance with value of Q > 10 A   B   C   D
• A.

2 1 4 3

• B.

4 3 2 1

• C.

4 1 2 3

• D.

2 3 4 1

• 19.
Gauge factor of a strain gauge is defined as the ratio of a per unit change in the
• A.

Conductivity to the per unit change in applied force acting on the element

• B.

Resistance to the per unit change in the length of the element

• C.

Stress to the per unit change in strain of the element

• D.

Current to the per unit change in the length of the element

• 20.
For an AM wave, the maximum voltage was found to be 10 V and the minimum voltage was found to be 5 V. The modulation index of the wave would be
• A.

Conductivity to the per unit change in applied force acting on the element 0.33

• B.

Resistance to the per unit change in the length of the element 0.52

• C.

0.40

• D.

0.1

• 21.
Hot wire anemometer is a device used to measure the
• A.

Pressure in gases

• B.

Liquid discharge

• C.

Gas velocities

• D.

Temperature

• 22.
The FM telemetry as compared with AM telemetry requires a channel that is
• A.

Equal to that of AM telemetry

• B.

Smaller than what is required for AM telemetry

• C.

100 times of that required for AM telemetry

• D.

10 times of that required for AM telemetry

• 23.
Digital measuring instruments use the following three types of A to D converters 1. Dual Slope Type 2. Counter Type 3. Flash Type The correct sequence for  these converters in decreasing order of their speed is
• A.

3, 1, 2

• B.

1, 2, 3

• C.

2, 3, 1

• D.

3, 2, 1

• 24.
Consider the following statements regarding the advantages of Anderson bridge: 1. It is the modification of the Maxwell’s inductance-capacitance bridge. 2. For measuring the low Q of coils, it is superior to the Maxwell’s bridge. 3. It is simple compared to Maxwell’s bridge. 4. It can be used to determine mutual inductance also
• A.

1, 2 and 3

• B.

1, 2 and 4

• C.

2 and 4

• D.

1, 3 and 4

• 25.
The output current versus input voltage transfer characteristic of an n-channel JFET is such that there is
• A.

Zero current flow at zero input voltage bias

• B.

Current flow only when a positive input threshold voltage is crossed

• C.

Current flow only when a negative input cut-off voltage bias is crossed

• D.

No cut-off input voltage

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