All Test Data Pakistan: KRL Sample Questions For Electrical/Electronics

KRL Sample Questions For Electrical/Electronics

Sample Paper (General)

1. The Laplace transform of e–2t is

(A) 0.5 s (B) 2/(s+1) (C) 1/(s+2) (D) 2/(s+2)

2. Tanθ in the accompanying diagram is

(A) y/(y+2x)

(B) x/(y+x)

(D) y/x

3. By a chord of the curve y = x3, we mean any line joining two distinct points on it. The number of chords which have slope 1 is

(A) infinite (B) 0 (C) 1 (D) 2

4. The absolute temperature for an ideal gas is

(A) directly proportional to the rotational K.E. of gas molecules

(B) directly proportional to vibrational K.E of gas molecules

(D) directly proportional to the P.E of the gas molecules

5. An engineer claims, with some thermodynamic analysis, that if the proposed construction site of a Nuclear power plant is changed from one city to another, Plant efficiency will increase (cost of construction and everything else is same). Does the change of city have to do anything with a thermodynamic efficiency of the plant?

(A) No

(B) Yes

(D) Yes, but only if population difference is negligible

6. A banana has twice the calories than an apple has. Also, a hamburger has 1.5 times as many calories as a banana.

Therefore,

(A) A hamburger has as many calories as one apple

(B) A hamburger has 2 times as many calories as one apple

(D) A hamburger has 4 times as many calories as one apple

7. Three pipes A, B and C can fill a tank in 10, 12 and 15 minutes respectively. First A was opened. After one minute B was opened and after two minutes from the start of A, C was opened. Find the time in which the tank is just full.

(A) 4 min,52 sec (B) 3 min (C) 3 min,52 sec (D) 4 min, 06 sec

8. Which number in the series should come next?

-1 0 1 8

(A) 15 (B) 20 (C) 25 (D) 27

9. The pressure P units and the volume V m3 of a quantity of gas stored at a constant temperature are related by pv=k. At a certain time, the volume of gas in the cylinder is 30 m3 and pressure is 20 units. If the gas is being compressed at the rate of 6m3 /sec, at what rate is the pressure changing?

(A) 4units/s increasing (B) 6 units/s increasing

10. The manager ---------- everyone go home an hour early on Friday afternoon.

A) allowed

B) let

C) permitted

D) got

Sample Paper (ELECTRICAL)

1. A sinusoidal voltage with equation Vm=sin 314 t is applied across a load and the current lags behind the voltage

by 30 degrees. Which of the following is NOT correct?

(A) The load is inductive in nature

(B) No power will be consumed in the circuit

(D) The power factor of the circuit will have a value of less than 1.0

2. Which of the following is not the function of transformer oil?

(A) Cooling the primary coil (B) Cooling the secondary coil

3. Overvoltage transient may occur in a transmission line due to

(A) Lightning (B) Switching

4. Which of the following statements is not correct for a purely inductive circuit?

(A) The power factor of the circuit is zero

(B) The power consumed in the circuit is zero

(D) All of the above statements are true for a purely inductive circuit

5. A transmitting aerial is radiating un-modulated carrier, the radiated power is 1200 W. If the carrier is now modulated simultaneously by two pure notes to a depth of 20% and 40% respectively, the total power radiated will now be

(A) 1320 W (B) 1200 W (C) 1180 W (D) 920 W

6. If the e.m.f. in the rotor of a three pole induction motor has a frequency of 1.5 Hz and that in the stator is 50 Hz. What is the speed at which the motor is running?

(A) 750 rpm

(B) 744 rpm

(D) 713.5 rpm

7. Which method of starting an induction motor is expected to take the largest starting current.

(A) Direct on-line starting

(B) Stator rotor starting

(D) Auto-transformer starting

8. The back e.m.f. set up in the stator of a synchronous motor will depend upon

(A) Rotor speed only

(B) Rotor excitation only

(D) Coupling angle, rotor speed, and excitation

9. An alternator is generating power at 210 V per phase while running at 1500 rpm. If the speed of an alternator

drops to 1000 rpm the generated voltage per phase will be

(A) 180 V

(B) 150 V

(D) 105 V

10. The driving power from the prime mover driving the alternator is lost but the alternator remains connected to the supply network and the field supply also remains on. The alternator will

(A) Get itself burnt

(B) Behave as an induction motor but will rotate in the opposite direction

(D) Behave as a synchronous motor but will rotate in a reverse direction to that

corresponding to generator action

Sample Paper (ELECTRONICS)

1. A diode that has a negative resistance characteristic is the

(A) Schottky diode (B) PIN diode

2. A given BJT has a beta (β) rating of 400, the value of alpha (α) for this device is;

(A) 1.0025 (B) 0.0025

3. For positive logic following is an ⇨⇨⇨⇨

(A) NAND Gate (B) AND Gate

4. In a Darlington pair configuration, each transistor has an ac beta of 125. If RE is 560Ω, the input resistance is;

(A) 560 Ω (B) 70 kΩ

5. The number of poles in a filter affects the

(A) voltage gain (B) bandwidth

6. The unit of magnetic charge is

(A) Amperes (B) Ampere-meter

7. A Wein bridge oscillator has R1=R2=220 KΩ, and C1=C2=250pF, The frequency of oscillation will be

nearly;

(A) 0.89 kHz (B) 1.89 kHz

8. To calibrate a pressure transmitter, with a range of 0 psi to 600 psi, to 0.02% of reading accuracy, which of the following test equipment would be best suited for the calibration?

(A) Precision dial gage. (B) Precision dead weight tester.

9. A certain fiber-optic cable has the following characteristics: n1 = 1.82 and n2 = 1.73. What is the value of

θc?

(A) 1.0o

(B) 0.95o

(D) 18.1o

10. 8086 is a 16-bit microprocessor having;

(A) 4-bit data bus (B) 8-bit data bus

All Test Data Pakistan

Wednesday, July 10, 2019

KRL Sample Questions For Electrical/Electronics

KRL Sample Questions For Electrical/Electronics

Sample Paper (General)

Sample Paper (ELECTRICAL)

Sample Paper (ELECTRONICS)

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