HAL MT Technical Exam Previous Paper

Here I am looking for the last year electronics question paper of HAL Management Trainee (MT) Technical Exam, can you please provide me the same???

[Kiran Chandar]

As you are looking for the last year electronics question paper of HAL Management Trainee (MT) Technical Exam, so here I am sharing the same with you

A single-phase transformer has no-load loss of 64 W, as obtained from an open-circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, the measured loss is 81 W. The transformer has maximum efficiency when operated at
(A) 50.0% of the rated current.
(B) 64.0% of the rated current.
(C) 80.0% of the rated current.
(D) 88.8% of the rated current.

A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles
(A) an AND gate (B) an OR gate (C) an XOR gate (D) a NAND gate

A band-limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency in kHz which is not valid is
(A) 5 (B) 12 (C) 15 (D) 20