CUET-UG (ICAR 20% All-India Quota) for B.Tech Agricultural Engineering · India · National Testing Agency
Original practice questions written to the published syllabus · not past papersCircuits, power, transformers, electronic devices and safe wiring: what a farm engineer needs before motors and sensors.
In the exams: NCEES FE Basic Electrical Engineering 6–9 questions; NCEES PE electrical circuits
How our questions for CUET-UG for B.Tech Agricultural Engineering spread across the units of Basic Electrical & Electronics Engineering. Difficulty: 23 easy, 9 medium, 1 hard.
| DC circuits and network theorems | 5 | |
| AC circuits, phasors and power factor | 5 | |
| Semiconductor devices and rectifiers | 5 | |
| Digital logic | 5 | |
| Transformers | 3 | |
| House wiring and earthing | 3 | |
| Single-phase and three-phase supply | 2 | |
| Operational amplifiers | 2 | |
| Electrical safety | 2 | |
| Electrical measuring instruments | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
A 12 V battery is connected across a lamp whose hot resistance is 4 Ω. Neglecting the battery's internal resistance, what current flows?
A. 3 A
Ohm's law: I = V/R = 12/4 = 3 A. Multiplying (12 × 4 = 48) gives volts×ohms, which is not a current; 0.33 A is R/V inverted; 16 A adds the numbers.
Three 6 Ω heating elements are connected in parallel. What is the equivalent resistance?
C. 2 Ω
For n equal resistors in parallel R = R/n = 6/3 = 2 Ω. 18 Ω is the series value; 0.5 Ω is the sum of conductances (1/6 × 3 = 0.5 S) quoted without inverting it.
In a balanced three-phase, four-wire star system, what current flows in the neutral conductor?
A. Zero, because the three phase currents sum to zero
Three equal currents displaced 120° have a phasor sum of zero, so a perfectly balanced load returns no neutral current. Neutral current appears only when the loads are unbalanced or the currents contain triplen harmonics.
A single-phase transformer steps 6600 V down to 220 V. The primary has 1500 turns. How many turns does the secondary have?
B. 50
N₂ = N₁ × V₂/V₁ = 1500 × 220/6600 = 50 turns. 45 000 multiplies by the inverse ratio; 150 and 300 are arithmetic slips.
What is the maximum theoretical rectification efficiency of a half-wave rectifier with a resistive load?
B. 40.6 %
η = P_dc/P_ac = (V_m/π)²/(V_m/2)² = 4/π² = 40.6 %. 81.2 % is the full-wave value; 48.2 % and 121 % are the full-wave and half-wave ripple factors (0.482 and 1.21) written as percentages.
A transistor has β = 100 and a base current of 40 µA in the active region. What are the collector and emitter currents?
D. I_C = 4 mA, I_E = 4.04 mA
I_C = βI_B = 100 × 40 µA = 4 mA; I_E = I_B + I_C = 4.04 mA. The emitter current is the largest of the three; subtracting gives an emitter current smaller than the collector current; 0.4 mA is a power-of-ten slip.
What is the binary number 10110110 in decimal and hexadecimal?
A. 182 and B6
128 + 32 + 16 + 4 + 2 = 182; grouping in fours, 1011 = B and 0110 = 6, so B6. 109 and 6D read the bits in reverse order; C6 mis-groups the upper nibble; 181 and B5 are off by one.
Why are NAND and NOR called universal gates?
C. Every logic function is realisable with either type alone
NOT, AND and OR can each be made from NAND gates only (or NOR gates only), so any Boolean function can be built. Universality is a logical property, not a speed or logic-family property.
A miniature circuit breaker (MCB) trips by two mechanisms. Which pairing is correct?
A. Bimetal for overload; magnetic coil for short circuit
A bimetallic strip heats and bends slowly under sustained overload (inverse-time trip); the magnetic coil trips instantly on the very high current of a short circuit. Earth-leakage sensing is the RCD's job, not a standard MCB's.
Taking a wet person's body-path resistance as 1000 Ω, what current flows on contact with a 230 V supply?
D. 230 mA
I = V/R = 230/1000 = 0.23 A = 230 mA — many times the few tens of milliamperes that can cause ventricular fibrillation. 0.23 mA is the same number misread as milliamperes; 4.35 mA inverts V/R; 23 mA would need a body resistance of 10 kΩ. Real body resistance varies widely with skin condition and contact area.
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