Explore topic-wise MCQs in Electrical Engineering.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

A simple slide wire potentiometer is used for measurement of current in a circuit. The voltage drop across a standard resistor of 0.1 Ω is balanced at 75 cm. Find the magnitude of current if the standard cell emf 1.45 volt is balanced at 50 cm.

A. 40 A
B. 35 A
C. 15.5 A
D. 21.75 A
Answer» E.
2.

DC potentiometer is a/an ________ type instrument.

A. deflection
B. 'null'
C. graduated
D. auxiliary
Answer» C. graduated
3.

How many turns of wire are needed to provide a potentiometer with a resolution of 0.05%?

A. 500
B. 5000
C. 200
D. 2000
Answer» E.
4.

Potentiometer sensitivity can be increased by

A. Increasing the current in potentiometer wire
B. Increasing the length of potentiometer wire
C. Decreasing the length of potentiometer wire
D. Replacing the standard cell by a regulated power supply
Answer» C. Decreasing the length of potentiometer wire
5.

Current in a circuit is measured using a simple slide wire. What will be the Voltage drop per unit lengthif the standard cell is of emf 2.38 V balanced at length of 35 cm ?

A. 0.68 V/cm
B. 0.068 V/cm
C. 68 V/cm
D. 6.8 V/cm
Answer» C. 68 V/cm
6.

High value pot resistance leads to _____.

A. low sensitivity
B. high sensitivity
C. low non-linearity
D. less error
Answer» C. low non-linearity
7.

_______ can be used to output a resistance which would be a function of the voltage applied to it.

A. Passive resistors
B. Capacitors
C. Trimmer
D. Potentiometers
Answer» E.
8.

A 3-turn 100 kΩ potentiometer with 1% linearity uses 30 V supply. What is the potentiometer constant?

A. 0.1 V/turn
B. 10 V/turn
C. 33.33 V/turn
D. 0.3 V/turn
Answer» C. 33.33 V/turn
9.

Potentiometer is basically a ____________ type instrument

A. Electrostatic
B. Thermal
C. Null
D. Magnetostatic
Answer» D. Magnetostatic
10.

A Murray loop test is conducted on a 400-m long faulty cable. At balance, the resistance connected to the faulty core was set to 40 Ω and the resistance of the resistor connected to the sound core was 60 Ω. What is the distance of the fault from the test end?

A. 267 m
B. 217 m
C. 160 m
D. 320 m
Answer» E.
11.

Potentiometer is used for:

A. Accurate measurement of emf of a cell or the potential difference (p.d.) between two points of an electric circuit.
B. Measurement of electrical resistance in the cell
C. Measurement of electric current in a cell
D. Measurement of capacitance of cell.
Answer» B. Measurement of electrical resistance in the cell
12.

DC potentiometer is an instrument to measure

A. unknown emf
B. large power
C. unknown velocity
D. low torque
Answer» B. large power
13.

A potentiometer work on

A. Heating effect
B. Magnetic effect
C. Electromagnetic induction
D. None of the above
Answer» E.
14.

A dc potentiometer is designed to measure up-to about 2 V with a slide wire of 1600 m. Standard cell of emf 1.2 V balances at 1200mm. a test cell is seen to balance at 1400 mm. the emf of the test cell is

A. 1.1 V
B. 1.2 V
C. 1.7 V
D. 1.4 V
Answer» E.