89.

90.

91.

92.

93.

94.

95.

96.

According to inverse square law, the illumination of a surface is

(A) directly proportional to distance between surface and the source

(B) directly proportional to square of distance between surface and the source
(C) inversely proportional to square of distance between surface and the source

(D) inversely proportional to distance between surface and the source

Electric motor used in mixer grinder is
(A) universal motor (B) capacitor start induction motor

(C) shaded pole motor (D) shunt motor

Which one of the following is an indicating type Instrument?
(A) Voltmeter (B) Ammeter
(C) Energy meter (D) Both (A) and (B)

The instrument that totalizes events over a specific period of time is called
(A) Recording instrument (B) Indicating instrument

(C) Integrating instrument (D) None of the above

Induction type measuring instruments are used for
(A) AC measurements only (B) DC measurements only
(C) Both AC and DC measurements (D) None of the above

Calculate the deflection (൫ in degrees) for a moving coil instrument with deflection
torque (T,) is given by 30 pNm and control spring constant is 2 wNm/degree.

(A) 100 (B) 150
(൭) 200 (D) 600

Which one of the following is a disadvantage of PMMC (permanent magnet moving
coil instrument)?

(A) PMMC can be modified into Ammeter and voltmeter.
(B) PMMC exhibits no hysteresis.
(C) Operation of PMMC is not significantly affected by stray magnetic field.

(D) Errors due to ageing of control spring and the permanent magnet.

Which of the following parameters remains unchanged between primary and secondary
windings of a step up transformer?

(A) Voltage (B) Current
(C) Resistance (D) Frequency

31/2021