How is the range of an ammeter and a voltmeter extended?

An ammeter range is extended by connecting a low-resistance shunt in parallel with the meter; a voltmeter range is extended by connecting a high-resistance multiplier in series with the meter.

What is a wattmeter and what does it measure?

A wattmeter is an instrument (usually dynamometer type) that measures electrical power in watts; it has a current coil in series with the load and a pressure (voltage) coil in parallel with the load.

What determines the current-carrying capacity (ampacity) of a cable?

Conductor cross-sectional area, conductor material (copper/aluminium), type of insulation and its temperature rating, ambient temperature, and method of installation (grouping, ventilation).

What is the difference between a fuse and an MCB?

A fuse is a one-time protective element—its wire melts on overcurrent and must be replaced. An MCB (Miniature Circuit Breaker) is a reusable switch that trips on overcurrent/short circuit and can be reset by hand.

Name the three colours of the IEC/Indian wiring code for live, neutral, and earth conductors.

Live (phase) = brown (old red), Neutral = light blue (old black), Earth = green/yellow striped (old green).

List the two main classes of electronic components and give examples of each.

Active components—supply or amplify energy/control current (diodes, transistors, ICs, SCRs). Passive components—store or dissipate energy without gain (resistors, capacitors, inductors).

What do the colour bands on a resistor represent, and what does a gold 4th band indicate?

The first two bands are significant digits, the third is the multiplier (number of zeros), and the fourth is tolerance. A gold tolerance band = ±5%.

What is the function of a capacitor and how does it behave with DC vs AC?

A capacitor stores energy in an electric field. It blocks DC (after charging) but allows AC to pass; its opposition to AC is capacitive reactance Xc = 1/(2πfC).

What is the function of a diode, and name a common rectifier use?

A diode allows current to flow in only one direction (forward biased) and blocks reverse current. It is commonly used as a rectifier to convert AC to DC (half-wave or full-wave/bridge rectifier).

What is the key difference between analog and digital signals?

An analog signal is continuous and can take any value within a range; a digital signal is discrete, represented by only two levels (0 and 1 / LOW and HIGH).

🇮🇳 RRB ALP (Assistant Loco Pilot) · flashcards

RRB ALP (Assistant Loco Pilot) Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) Flashcards

50 question-and-answer cards covering Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) as it is examined in RRB ALP (Assistant Loco Pilot). 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.

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24 sample cards from the Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) deck

Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.

How is the range of an ammeter and a voltmeter extended?
An ammeter range is extended by connecting a low-resistance shunt in parallel with the meter; a voltmeter range is extended by connecting a high-resistance multiplier in series with the meter.
What is a wattmeter and what does it measure?
A wattmeter is an instrument (usually dynamometer type) that measures electrical power in watts; it has a current coil in series with the load and a pressure (voltage) coil in parallel with the load.
What determines the current-carrying capacity (ampacity) of a cable?
Conductor cross-sectional area, conductor material (copper/aluminium), type of insulation and its temperature rating, ambient temperature, and method of installation (grouping, ventilation).
What is the difference between a fuse and an MCB?
A fuse is a one-time protective element—its wire melts on overcurrent and must be replaced. An MCB (Miniature Circuit Breaker) is a reusable switch that trips on overcurrent/short circuit and can be reset by hand.
Name the three colours of the IEC/Indian wiring code for live, neutral, and earth conductors.
Live (phase) = brown (old red), Neutral = light blue (old black), Earth = green/yellow striped (old green).
List the two main classes of electronic components and give examples of each.
Active components—supply or amplify energy/control current (diodes, transistors, ICs, SCRs). Passive components—store or dissipate energy without gain (resistors, capacitors, inductors).
What do the colour bands on a resistor represent, and what does a gold 4th band indicate?
The first two bands are significant digits, the third is the multiplier (number of zeros), and the fourth is tolerance. A gold tolerance band = ±5%.
What is the function of a capacitor and how does it behave with DC vs AC?
A capacitor stores energy in an electric field. It blocks DC (after charging) but allows AC to pass; its opposition to AC is capacitive reactance Xc = 1/(2πfC).
What is the function of a diode, and name a common rectifier use?
A diode allows current to flow in only one direction (forward biased) and blocks reverse current. It is commonly used as a rectifier to convert AC to DC (half-wave or full-wave/bridge rectifier).
What is the key difference between analog and digital signals?
An analog signal is continuous and can take any value within a range; a digital signal is discrete, represented by only two levels (0 and 1 / LOW and HIGH).
What is the output of an AND gate and an OR gate for inputs A and B?
AND gate output = A·B (HIGH only when all inputs are HIGH). OR gate output = A+B (HIGH when any input is HIGH).
State the truth-table behaviour of a NAND gate.
A NAND gate output is LOW (0) only when all inputs are HIGH; for all other input combinations the output is HIGH (1). It is the inverse of AND and is a universal gate.
Convert binary 1011 to decimal.
1011₂ = (1×8)+(0×4)+(1×2)+(1×1) = 8+0+2+1 = 11 in decimal.
What is the purpose of a cathode-ray oscilloscope (CRO)?
A CRO displays the waveform of an electrical signal on a screen, allowing measurement of voltage (amplitude), frequency/time period, and phase, and visual analysis of signal shape.
What is a multimeter and what quantities can it measure?
A multimeter is a multi-function test instrument that measures voltage (AC/DC), current (AC/DC), and resistance; many also test continuity, diodes, and capacitance.
What composition of solder is commonly used for electronic soldering, and what is the role of flux?
A common solder is 60/40 tin-lead (60% tin, 40% lead) with a low melting point (~188°C). Flux cleans the metal surfaces, removes oxides, and helps the molten solder flow and wet the joint.
What is the ideal characteristic of a good soldered joint?
A good joint is shiny/bright, smooth, concave (well-wetted) and mechanically strong with low electrical resistance; a dull, grainy, or blobby joint indicates a 'dry' (cold) joint.
What are the four strokes of a four-stroke petrol (SI) engine in order?
Suction (intake), Compression, Power (expansion/combustion), and Exhaust. The cycle is the Otto cycle and takes two crankshaft revolutions.
What is the main difference between a petrol (SI) engine and a diesel (CI) engine in terms of ignition?
A petrol/SI engine uses a spark plug to ignite an air-fuel mixture (spark ignition, Otto cycle). A diesel/CI engine has no spark plug—fuel injected into hot compressed air self-ignites (compression ignition, Diesel cycle), with a much higher compression ratio.
What is the function of the fuel injector and the fuel pump in a diesel engine?
The fuel-injection (FIP) pump pressurizes diesel and delivers a metered quantity at the right time; the injector atomizes and sprays the high-pressure fuel into the combustion chamber for efficient burning.
Name the two main types of engine cooling systems and the key part of a liquid cooling system.
Air cooling and liquid (water) cooling. The radiator is the key part of a liquid cooling system—it dissipates heat from the circulating coolant, aided by a water pump, thermostat, and fan.
What is the function of a clutch and a gearbox in a vehicle transmission?
The clutch engages/disengages the engine from the gearbox to allow smooth starting and gear changing. The gearbox (transmission) provides different gear (speed/torque) ratios between engine and wheels.
What is the basic difference between drum brakes and disc brakes?
Drum brakes use brake shoes that press outward against the inner surface of a rotating drum. Disc brakes use pads that clamp onto a rotating disc/rotor; disc brakes dissipate heat better and resist fade.
In automobile maintenance, why is regular engine-oil change important, and what does the oil do?
Engine oil lubricates moving parts (reduces friction/wear), cools, cleans (carries away contaminants), and seals. Over time it degrades and accumulates contaminants, so periodic changing maintains lubrication and prevents engine damage.

What this deck covers

The Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) deck follows the RRB ALP (Assistant Loco Pilot) Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) syllabus — 5 chapters and 20 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 10.0 cards per chapter.

Answers are written to be recallable, not just readable — averaging about 176 characters, which is long enough to carry the reasoning and short enough to say out loud.

A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.

Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) flashcards FAQ

How many Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) flashcards are in this RRB ALP (Assistant Loco Pilot) deck?

50 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.

Are these RRB ALP (Assistant Loco Pilot) flashcards free?

Yes. The preview here is free to read with no signup, and the full 50-card deck is free inside the Examius app.

What do the Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) cards cover?

They follow the RRB ALP (Assistant Loco Pilot) Trade-Specific / Relevant Trade (CBT Stage 2 Part B - Qualifying) syllabus — 5 chapters and 20 topics — so the questions track what is actually examinable.

How should I use these flashcards?

Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.