GATE 2020: Measurements Rapid Mini Mock for ESE & GATE EE Exams

Question 1

A dual trace oscilloscope is set to operate in the alternate mode. The control input of the multiplexer used in the y-circuit is fed with a signal having a frequency equal to

Question 2

The items in Group I represent the various types of measurements to be made with a reasonable accuracy using a suitable bridge. The items in Group II represent the various bridges available for this purpose. Select the correct choice of the item in Group II for the corresponding item in Group I from the following

Question 3

The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

Question 4

A lissajous pattern on oscilloscope is stationary and has 6 horizontal tangencies and 4 vertical tangencies. The frequency of horizontal input is 1200 Hz. determine the frequency of vertical input.

Question 5

A 200/1 Current transformer (CT) is wound with 200 turns on the secondary on a toroidal core. When it carries a current of 160 A on the primary, the ratio and phase errors of the CT are found to be – 0.5% and 30 minutes respectively. If the number of secondary turns is reduced by 1 the new ratio error (%) and phase error (min) will be respectively

Question 6

A moving coil ammeter has a moving coil of dimensions 20 mm × 15 mm with 150 turns. If a current of 4 mA is applied to the coil, find the angular deflection (in degree) of the pointer. The flux density in the air gap is 1.6 × 10^-3 Wb/m² and the spring constant is 0.46 × 10^-6 Nm/rad.

Question 7

The time.div and voltage/div axes of an oscilloscope have been erased. As student connects a 1 kHz, 5V p-p square wave calibration pulse to channel 1 of the scope and observes the screen to be as shown in upper trace of the figure. An unknown signal is connected to channel 2 (lower trace) of the scope. If the time, the amplitude (p–p) and period of the unkmown signal are respectively

Question 8

A variable w is related to three other variables x,y,z as w = xy/z. The variables are measured with meters of accuracy ±0.5% reading, ±1% of full-scale value and ±1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full-scale value for all three. The maximum uncertainty in the measurement of w will be

Question 9

The line-to-line input voltage to the 3 phase, 50 Hz, ac circuit shown in the following figure is 100 V rms. Assuming that the phase sequence is RYB, the wattmeters would read
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Question 10

A moving iron ammeter produces a full-scale torque of 240 μNm with a deflection of 120^o at a current of 10 A. The rate of change of self-inductance (μH/radian) of the instrument at full scale is

Question 11

The ac bridge shown in the figure is used to measure the impedance Z.

If the bridge is balanced for oscillator frequency f = 2 kHz, then the impedance Z will be

Question 12

A single-phase load is connected between R and Y terminals of a 415 V, symmetrical, 3-phase, 4-wire system with phase sequence RYB. A wattmeter is connected in the system as shown in figure. The power factor of the load is 0.8 lagging. The wattmeter will read