# Hero Skill Innovation And Employability Program

30 Questions | Total Attempts: 87  Settings  • 1.
To prevent a DC return between source and load, it is necessary to use
• A.

• B.

• C.

• D.

Either (a) or (b)

• 2.
For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100
• A.

10 μA

• B.

100 μA

• C.

1 mA

• D.

10 mA

• 3.
To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
• A.

Surge resistor

• B.

Surge inductor

• C.

Surge capacitor

• D.

Both (a) and (b)

• 4.
If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of
• A.

1/2

• B.

1/3

• C.

1/6

• D.

1/12

• 5.
N a CE amplifier the input impedance is equal to the ratio of
• A.

Ac base voltage to ac base current

• B.

Ac base voltage to ac emitter current

• C.

Ac emitter voltage to ac collector current

• D.

Ac collector voltage to ac collector current

• 6.
For a system to work, as oscillator the total phase shift of the loop gain must be equal to
• A.

90°

• B.

45°

• C.

270°

• D.

360°

• 7.
The most widely used LC oscillator is
• A.

Hartley oscillator

• B.

Crystal oscillator

• C.

Colpitt's oscillator

• D.

Clapp's oscillator

• 8.
"Half-splitting" is
• A.

A means for nuclear fuel cells to produce electricity

• B.

A means of isolating a problem in a circuit

• C.

A means for reducing a high ac voltage to a low dc voltage

• D.

A means of limiting current in a circuit

• 9.
If the resistance in a circuit with constant voltage increases, the current will
• A.

Increase

• B.

Decrease

• C.

Stay the same

• D.

None

• 10.
What is the power in the given circuit?
• A.

3.6 W

• B.

35 W

• C.

175 W

• D.

245 W

• 11.
A battery's capacity to deliver power is measured in
• A.

Kwh

• B.

Ah

• C.

Mh

• D.

Vh

• 12.
If current through a resistance is halved
• A.

The resistance is halved

• B.

The voltage is halved

• C.

The voltage doubles

• D.

None of the above

• 13.
Ohm's law is a relationship between
• A.

Voltage, current, and time

• B.

Power, current, and resistance

• C.

Resistance, time, and current

• D.

Voltage, current, and resistance

• 14.
The brake power of a diesel engine, keeping other parameters constant, can be increased by
• A.

Decreasing the density of intake air

• B.

Increasing the temperature of intake air

• C.

Increasing the pressure of intake air

• D.

Decreasing the pressure of intake air

• 15.
The expansion of fuel in a four stroke cycle diesel engine
• A.

Starts at 15° before top dead centre and ends at 30° after top dead centre

• B.

Starts at top dead centre and ends at 30° after top dead centre

• C.

Starts at 15° after top dead centre and ends at 30° before bottom dead centre

• D.

May start and end anywhere

• 16.
Reactors for propulsion applications are designed for
• A.

Any form of uranium

• B.

Natura uranium

• C.

Enriched uranium

• D.

Plutonium

• 17.
The primary fuel used in nuclear power plants is
• A.

U235

• B.

U238

• C.

Pu239

• D.

Pu233

• 18.
In which of the following are operational amplifiers (op-amps) used?
• A.

Oscillators

• B.

Filters

• C.

Instrumentation circuits

• D.

All of the above

• 19.
For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms?
• A.

150

• B.

200

• C.

250

• D.

300

• 20.
What is the level of the voltage between the input terminals of an op-amp?
• A.

Virtually zero

• B.

5 V

• C.

18 V

• D.

22 V

• 21.
A three-stage op-amp can have a maximum phase lag of ________°.
• A.

-180

• B.

-90

• C.

-270

• D.

None of these

• 22.
The summing amplifier contains an inverting amplifier.
• A.

True

• B.

False

• 23.
Which of the following symptom is caused as a result of brake disc run out ?
• A.

Ineffectiveness of the brakes

• B.

Judder during braking

• C.

Localized wearing of the brake pads

• D.

Rapid wearing of the brake pads

• 24.
The function of an alternator in an automobile is to
• A.

Supply electric power

• B.

Convert mechanical energy into electrical energy

• C.

Continually recharge the battery

• D.

Partly convert engine power into electric power

• 25.
In a unit type body (frameless body) design, the sheet metal parts are welded together, forming a frame work to which outer skin is attached.
• A.

True

• B.

False Back to top